Java Basic Programs
1. Data Out Put Example (Hello Java World)
class Prog1
{
public static void main(String args[])
{
System.out.println("Hello Java World!");
System.out.println("Telutu IT Tutorials");
System.out.println("Ongole");
}
}
2 Data Reading from Keyboard using Scanner
import java.util.*;
class Prog2
{
public static void main(String args[])
{
Scanner scanner = new Scanner(System.in);
int a,b,c;
System.out.println("Enter a,b values");
a=scanner.nextInt();
b=scanner.nextInt();
c=a+b;
System.out.println("A=" + a);
System.out.println("B=" + b);
System.out.println("Sum=" + c);
}
}
3 Area Calculation Example
import java.util.*;
class Prog3
{
public static void main(String args[])
{
Scanner scanner=new Scanner(System.in);
float r,area,pi=3.1416f;
System.out.println("Enter radius value");
r=scanner.nextFloat();
area=pi*r*r;
System.out.println(r + " Area is " + area);
}
}
Control Statements
1 if...else (Nested if...else) Example
import java.util.*;
class Prog1
{
public static void main(String args[])
{
int m,p,c,avg;
Scanner in=new Scanner(System.in);
System.out.println("Enter m,p,c values");
m=in.nextInt();
p=in.nextInt();
c=in.nextInt();
avg=((m+p+c)/3);
if(m>34 && c>34 && p>34)
{
if(avg>34 && avg<50)
{
System.out.println("Ordianary");
}
else if(avg>=50 && avg<60)
{
System.out.println("Second class");
}
else if(avg>=60 && avg<75)
{
System.out.println("First Class");
}
else if(avg>=75 && avg<=100)
{
System.out.println("Distinction");
}
else if(avg>100)
{
System.out.println("Given Marks is Wrong");
}
}
else
{
if(m<35)
System.out.print("Maths ");
if(p<35)
System.out.print("Phy ");
if(c<35)
System.out.print("Che ");
System.out.print(" Failed");
}
}
}
2 While Loop Example
import java.util.Scanner;
class Prog2
{
public static void main(String args[])
{
int n,i;
Scanner in=new Scanner(System.in);
System.out.println("Enter n value");
n=in.nextInt();
i=1;
while(i<=10)
{
System.out.println(n + "X" + i + "=" + n*i);
i++;
}
}
}
3 For Loop with Nested
/*
1
12
123
1234
12345
*/
import java.util.*;
class Prog3
{
public static void main(String args[])
{
int n;
Scanner in=new Scanner(System.in);
System.out.println("Enter n value");
n=in.nextInt();
for(int i=1;i<=n;i++)
{
for(int j=1;j<=i;j++)
{
System.out.print(j + " ");
}
System.out.println("");
}
for(int i=n-1;i>=1;i--)
{
for(int j=1;j<=i;j++)
{
System.out.print(j + " ");
}
System.out.println("");
}
}
}
4 do..while Exmaple
import java.util.*;
class Prog4
{
public static void main(String args[])
{
int amount,sum=0;
Scanner in=new Scanner(System.in);
do
{
System.out.println("Enter Amount");
amount=in.nextInt();
if(amount>0)
{
sum=sum+amount;
System.out.println("Cumilative Amount is :" + sum);
}
}while(amount>0);
System.out.println("The Total Amount is " + sum);
}
}
5 Switch...Case...Break with do..while
import java.util.*;
class Prog5
{
public static void main(String args[])
{
int a,b,c;
Scanner in=new Scanner(System.in);
System.out.println("Enter a,b values");
a=in.nextInt();
b=in.nextInt();
do{
System.out.println("1.Addition");
System.out.println("2.Subtraction");
System.out.println("3.Multiplication");
System.out.println("4.Division");
System.out.println("5.Modulus");
System.out.println("6.Exit");
System.out.println("Enter Your Choice ");
c=in.nextInt();
switch(c)
{
case 1:
System.out.println("A+B=" + (a+b));
break;
case 2:
System.out.println("A-B=" + (a-b));
break;
case 3:
System.out.println("AXB=" + (a*b));
break;
case 4:
System.out.println("A/B=" + (a/b));
break;
case 5:
System.out.println("A%B=" + (a%b));
break;
default:
System.out.println("Your Exit");
}
}while(c<=5);
}
}
Arrays
1 One Dimensional Array Example
import java.util.*;
class Prog1
{
public static void main(String args[])
{
/*int a[],n,i;*/
int[] a;
int n,i;
Scanner in=new Scanner(System.in);
System.out.println("Enter array size");
n=in.nextInt();
a=new int[n]; //Re initilization array
System.out.println("Enter " + n + " Elements");
for(i=0;i<n;i++)
{
a[i]=in.nextInt();
}
System.out.println("The Elements are");
for(i=0;i<n;i++)
{
System.out.print(a[i] + " ");
}
System.out.println("\nThe Elements in Reverse is ");
for(i=n-1;i>=0;i--)
{
System.out.print(a[i] + " ");
}
}
}
2 Two Dimensional Array Example
import java.util.*;
class Prog2
{
public static void main(String args[])
{
int a[][],r,c,i,j;
Scanner in=new Scanner(System.in);
System.out.println("Enter r,c values");
r=in.nextInt();
c=in.nextInt();
a=new int[r][c];
System.out.println("Enter " + r + "X" + c + " Matrix values");
for(i=0;i<r;i++)
{
for(j=0;j<c;j++)
{
a[i][j]=in.nextInt();
}
}
System.out.println("The Matrix is ");
for(i=0;i<r;i++)
{
for(j=0;j<c;j++)
{
System.out.print(a[i][j] + " ");
}
System.out.println("");
}
}
}
Functions
1 No Arguments pass and No Return value
//No Arguments Pass and No Return values
import java.util.*;
class Prog1
{
public static void area()
{
float r,pi=3.1416f,a;
Scanner in=new Scanner(System.in);
System.out.println("Enter radius value");
r=in.nextFloat();
a=pi*r*r;
System.out.println(r + " Area is " + a);
}
public static void main(String args[])
{
int n,i;
Scanner in=new Scanner(System.in);
System.out.println("Enter n value");
n=in.nextInt();
for(i=1;i<=n;i++)
{
area();
}
}
}
2 Arguments Pass but No Return value
import java.util.*;
class Prog2
{
public static void area(float r)
{
float pi=3.1416f,a;
a=pi*r*r;
System.out.println(r + " Area is " + a);
}
public static void main(String args[])
{
int n,i;
float r;
Scanner in=new Scanner(System.in);
System.out.println("Enter n value");
n=in.nextInt();
for(i=1;i<=n;i++)
{
System.out.println("Enter Radius value");
r=in.nextFloat();
area(r);
}
}
}
3 Arguments pass and Return value
import java.util.*;
class Prog3
{
public static float area(float r)
{
float pi=3.1416f,a;
a=pi*r*r;
return(a);
}
public static void main(String args[])
{
int n,i;
float r,a;
Scanner in=new Scanner(System.in);
System.out.println("Enter n value");
n=in.nextInt();
for(i=1;i<=n;i++)
{
System.out.println("Enter Radius value");
r=in.nextFloat();
a=area(r);
System.out.println(r + " Area is " + a);
}
}
}
4 No Arguments pass but Return value
// No Arguments Pass But Return values
import java.util.*;
class Prog4
{
public static float area()
{
float r,pi=3.1416f,a;
Scanner in=new Scanner(System.in);
System.out.println("Enter Radius value");
r=in.nextFloat();
a=pi*r*r;
System.out.print(r);
return(a);
}
public static void main(String args[])
{
int n,i;
float a;
Scanner in=new Scanner(System.in);
System.out.println("Enter n value");
n=in.nextInt();
for(i=1;i<=n;i++)
{
a=area();
System.out.println(" Area is " + a);
}
}
}
Functions Overloading
1 Functions Overloading Example
/*
Functions Overloading ?
The function name is the common and the parameters is different is called a
functions overloading
*/
import java.util.*;
class Prog1
{
public static int sum(int a,int b)
{
return(a+b);
}
public static int sum(int a,int b,int c)
{
return(a+b+c);
}
public static int sum(int a,int b,int c,int d)
{
return(a+b+c+d);
}
public static float sum(int a,float b)
{
return(a+b);
}
public static float sum(float a,int b)
{
return(a+b);
}
public static float sum(float a,float b)
{
return(a+b);
}
public static void main(String args[])
{
int a,b,c,d;
float e,f;
Scanner in=new Scanner(System.in);
System.out.println("Enter any four Integers");
a=in.nextInt();
b=in.nextInt();
c=in.nextInt();
d=in.nextInt();
System.out.println("Enter any two Float numbers");
e=in.nextFloat();
f=in.nextFloat();
System.out.println("A+B=" + sum(a,b));
System.out.println("A+B+C=" + sum(a,b,c));
System.out.println("A+B+C+D=" + sum(a,b,c,d));
System.out.println("A+E=" + sum(a,e));
System.out.println("E+A=" + sum(e,a));
System.out.println("E+F=" + sum(e,f));
}
}
OOPS
1 Simple Class Example
/*
What is the Class ?
The combination state and behaviour of the object is called class
What is the Object ?
A instance of the class is called object
*/
import java.util.*;
class Student
{
int code;
String name;
String course;
public void setStudent(int intcode,String strname,String strcourse)
{
code=intcode;
name=strname;
course=strcourse;
}
public void showStudent()
{
System.out.println("Code : " +code);
System.out.println("Name : " +name);
System.out.println("Course : " +course);
}
}
class Prog1
{
public static void main(String args[])
{
Student student1=new Student();
int code;
String name,course;
Scanner in=new Scanner(System.in);
System.out.println("Enter Code Name Course");
code=in.nextInt();
name=in.next();
course=in.next();
student1.setStudent(code,name,course);
Student student2=new Student();
System.out.println("Enter Code Name Course for Student 1");
code=in.nextInt();
name=in.next();
course=in.next();
student2.setStudent(code,name,course);
student1.showStudent();
student2.showStudent();
}
}
2 Direct Members access in Class Example
/*if your using private keyword with in the class memebers we can't
access out side of the class other then private it can access*/
import java.util.*;
class Person
{
int code;
String name;
String course;
}
class Prog2
{
public static void main(String args[])
{
Person person=new Person();
Scanner in=new Scanner(System.in);
System.out.println("Enter Code Name Course");
person.code=in.nextInt();
person.name=in.next();
person.course=in.next();
System.out.println("Code : " + person.code);
System.out.println("Name : " + person.name);
System.out.println("Course : " + person.course);
}
}
Constructors
1 Constructor Example
/*
What is the Constructor ?
The constructor can initialize the class members
note: whenever we instantiated the class then automatically the constructor
executed
Rules:
1)The constructor name must be a class name
2)No return type in constructors
Types of Constructors:
1)Default constructor(With out parameters or arguments)
2)Parameterised constructor( With parameters or arguments)
Overloading Construrctor:
if you are using default constructor and parameterised constructor
using a single class i.e overloading construcotrs
*/
import java.util.*;
class Employee
{
int code;
String name;
String desig;
Employee()
{
code=100;
name="SrinivasaRao.K";
desig="Engg";
}
public void setEmployee(int code,String name,String desig)
{
this.code=code;
this.name=name;
this.desig=desig;
}
public void showEmployee()
{
System.out.println("Code : " + code);
System.out.println("Name : " + name);
System.out.println("Desig : " + desig);
}
}
class Prog1
{
public static void main(String args[])
{
int code;
String name,desig;
Scanner in=new Scanner(System.in);
Employee employee=new Employee();
employee.showEmployee();
System.out.println("Enter code name desig");
code=in.nextInt();
name=in.next();
desig=in.next();
employee.setEmployee(code,name,desig);
employee.showEmployee();
}
}
2. Default and Parameterised Constructors
/*Default Contructor and Parameterised Constructor*/
import java.util.*;
class Employee
{
int code;
String name;
String desig;
Employee()//default constructor
{
code=100;
name="SrinivasaRao.K";
desig="Engg";
}
Employee(int code,String name,String desig)//parameterised constructor
{
this.code=code;
this.name=name;
this.desig=desig;
}
public void setEmployee(int code,String name,String desig)
{
this.code=code;
this.name=name;
this.desig=desig;
}
public void showEmployee()
{
System.out.println("Code : " + code);
System.out.println("Name : " + name);
System.out.println("Desig : " + desig);
}
}
class Prog2
{
public static void main(String args[])
{
int code;
String name,desig;
Scanner in=new Scanner(System.in);
System.out.println("Enter code name desig");
code=in.nextInt();
name=in.next();
desig=in.next();
Employee employee=new Employee();//default constructor
employee.showEmployee();
employee.setEmployee(code,name,desig);
employee.showEmployee();
Employee employee1=new Employee(102,"Durrga","CSC");
//parameterised constructor
employee1.showEmployee();
employee1.setEmployee(code,name,desig);
employee1.showEmployee();
}
}
Inheritance
1 Single Inheritance
/*
What is Inheritance?
A relation between the Parent class and Child class is called inheritance
or
A Mechanisam between the Base class and derived class is called inhertinace
Single Inheritance
*/
import java.util.*;
class Father
{
int fcode;
String fname;
Father(int fcode,String fname)
{
this.fcode=fcode;
this.fname=fname;
}
}
class Child extends Father
{
int code;
String name;
Child(int fcode,String fname,int code,String name)
{
super(fcode,fname);
this.code=code;
this.name=name;
}
void showDetails()
{
System.out.println("Father Code " + fcode);
System.out.println("Father Name " + fname);
System.out.println("Child Code " + code);
System.out.println("Child Name " + name);
}
}
class Prog1
{
public static void main(String args[])
{
int fcode,code;
String fname,name;
Scanner in=new Scanner(System.in);
System.out.println("Enter Father Code and Name");
fcode=in.nextInt();
fname=in.next();
System.out.println("Enter Child Code and Name");
code=in.nextInt();
name=in.next();
Child child =new Child(fcode,fname,code,name);
child.showDetails();
}
}
2 Multi Level Inheritance
/*Multilevel Inheritance*/
import java.util.*;
class GFather
{
int gcode;
String gname;
GFather(int gcode,String gname)
{
this.gcode=gcode;
this.gname=gname;
}
}
class Father extends GFather
{
int fcode;
String fname;
Father(int gcode,String gname,int fcode,String fname)
{
super(gcode,gname);
this.fcode=fcode;
this.fname=fname;
}
}
class Child extends Father
{
int code;
String name;
Child(int gcode,String gname,int fcode,String fname,int code,String name)
{
super(gcode,gname,fcode,fname);
this.code=code;
this.name=name;
}
void showDetails()
{
System.out.println("GFather Code " + gcode);
System.out.println("GFather Name " + gname);
System.out.println("Father Code " + fcode);
System.out.println("Father Name " + fname);
System.out.println("Child Code " + code);
System.out.println("Child Name " + name);
}
}
class Prog2
{
public static void main(String args[])
{
int gcode,fcode,code;
String gname,fname,name;
Scanner in=new Scanner(System.in);
System.out.println("Enter GFather Code and Name");
gcode=in.nextInt();
gname=in.next();
System.out.println("Enter Father Code and Name");
fcode=in.nextInt();
fname=in.next();
System.out.println("Enter Child Code and Name");
code=in.nextInt();
name=in.next();
Child child =new Child(gcode,gname,fcode,fname,code,name);
child.showDetails();
}
}
3 Hirarchical Inheritance Example
/*Hirarchical Inheritance*/
import java.util.*;
class Father
{
int fcode;
String fname;
Father(int fcode,String fname)
{
this.fcode=fcode;
this.fname=fname;
}
}
class Child1 extends Father
{
int code;
String name;
Child1(int fcode,String fname,int code,String name)
{
super(fcode,fname);
this.code=code;
this.name=name;
}
void showDetails()
{
System.out.println("Father Code " + fcode);
System.out.println("Father Name " + fname);
System.out.println("Child Code " + code);
System.out.println("Child Name " + name);
}
}
class Child2 extends Father
{
int code;
String name;
Child2(int fcode,String fname,int code,String name)
{
super(fcode,fname);
this.code=code;
this.name=name;
}
void showDetails()
{
System.out.println("Father Code " + fcode);
System.out.println("Father Name " + fname);
System.out.println("Child Code " + code);
System.out.println("Child Name " + name);
}
}
class Prog3
{
public static void main(String args[])
{
int fcode,code1,code2;
String fname,name1,name2;
Scanner in=new Scanner(System.in);
System.out.println("Enter Father Code and Name");
fcode=in.nextInt();
fname=in.next();
System.out.println("Enter Child1 Code and Name");
code1=in.nextInt();
name1=in.next();
System.out.println("Enter Child2 Code and Name");
code2=in.nextInt();
name2=in.next();
Child1 child1 =new Child1(fcode,fname,code1,name1);
Child2 child2 =new Child2(fcode,fname,code2,name2);
child1.showDetails();
child2.showDetails();
}
}
Abstract Classes
1 Abstract Class Example1
/*
Polymorphisam
method overridding
multiple Inheritance
Abstract Classes
The abstract class inside can accept ordinary methods
ordinary variables
Abstract methods(Declaration only)
Final variables
Note:Every abstract class before we must type abstract keyword
Interfaces
No need of to abstract key bofore the class name why becuase by default
all Interfaces are declared as abstract Classes
The interfaces can accept Static final varibales and
abstract methods(Declaration only)
*/
import java.util.*;
abstract class Bike
{
abstract void getBenifit();
}
class Honda extends Bike
{
void getBenifit()
{
System.out.println("Honda Running Smoothly");
}
}
class Bajaj extends Bike
{
void getBenifit()
{
System.out.println("Bajaj Gives More Milage");
}
}
class Bullet extends Bike
{
void getBenifit()
{
System.out.println("Bullet is More Power like (350 cc)");
}
}
class Prog1
{
public static void main(String args[])
{
int choice;
Scanner in=new Scanner(System.in);
do
{
System.out.println("Enter Your Choice(Honda-1,Bajaj-2,Bullet-3,Others-[4-9])");
choice=in.nextInt();
if(choice==1)
{
Bike honda = new Honda();
honda.getBenifit();
}
else if(choice==2)
{
Bike baja= new Bajaj();
baja.getBenifit();
}
else if(choice==3)
{
Bike bullet= new Bullet();
bullet.getBenifit();
}
else
{
System.out.println("Your Selection is out Range");
}
}while(choice>0 && choice<=3);
}
}
2 Abstract Class Example 2
import java.util.*;
abstract class Area
{
String cname;
abstract float getArea(float param1,float param2);
public void showName()
{
cname="KKCC INFO SYSTEMS";
System.out.println(cname);
}
}
class Rectangle extends Area
{
float getArea(float l,float w)
{
return(l*w);
}
}
class Circle extends Area
{
float getArea(float r,float r1)
{
return(3.1416f*r*r);
}
}
class Prog2
{
public static void main(String args[])
{
Scanner in=new Scanner(System.in);
Area rectangle = new Rectangle();
Area circle= new Circle();
float a,r;
int l,w;
System.out.println("Enter l,w values");
l=in.nextInt();
w=in.nextInt();
a= rectangle.getArea(l,w);
rectangle.showName();
System.out.println("Rectangle Area = " + a);
System.out.println("Enter Radius value");
r=in.nextFloat();
circle.showName();
a=circle.getArea(r,0f);
System.out.println("Circle Area = " +a);
}
}
Interfaces
1 Interface Example
import java.util.*;
// interfaces are allowed only static final variables and abstract methods
// all interfaces are declared by default as abstract
interface Area
{
public float getArea(float l,float w);
public static final String objname="KKCC INFO SYSTEMS";
}
class Rectangle implements Area
{
public float getArea(float l,float w)
{
return(l*w);
}
}
class Circle implements Area
{
public float getArea(float r,float r1)
{
return(3.1416f*r*r);
}
}
class Square implements Area
{
public float getArea(float l,float w)
{
return(l*w);
}
}
class Prog3
{
public static void main(String args[])
{
Scanner in=new Scanner(System.in);
Area rectangle = new Rectangle();
Area circle= new Circle();
Area square=new Square();
float l,w,r,a;
System.out.println("Enter l,w values");
l=in.nextFloat();
w=in.nextFloat();
a= rectangle.getArea(l,w);
System.out.println("Rectangle Area = " + a);
System.out.println("Object Name=" + rectangle.objname);
System.out.println("Enter Radius values");
r=in.nextFloat();
a=circle.getArea(r,0.0f);
System.out.println("Circle Area = " + a);
System.out.println("Object Name=" + circle.objname);
System.out.println("Enter Side values");
l=in.nextFloat();
a=square.getArea(l,l);
System.out.println("Square Area ="+ a);
System.out.println("Object Name=" + square.objname);
}
}
2 Interface Example 2
interface Comp
{
public static final String objname="KKCC INFO SYSTEMS";
}
interface Area extends Comp
{
public float getArea(float a,float b);
}
class Rectangle implements Area
{
public float getArea(float l,float w)
{
return(l*w);
}
}
class Circle implements Area
{
public float getArea(float r,float r1)
{
return(3.1416f*r*r);
}
}
class Prog4
{
public static void main(String args[])
{
Area rectangle = new Rectangle();
Area circle= new Circle();
float a;
a= rectangle.getArea(5,6);
System.out.println("Rectangle Area = " + a);
System.out.println("Object Name=" + rectangle.objname);
a=circle.getArea(4.56f,0f);
System.out.println("Circle Area = " + a);
System.out.println("Object Name=" + circle.objname);
}
}
Built-in Functions
1 String Functions
//String Functions Example
import java.util.*;
class Prog1
{
public static void main(String args[])
{
String name;
Scanner in=new Scanner(System.in);
int p;
name="Hellow How Are You";
System.out.println("Enter Which position character you want print");
p=in.nextInt();
System.out.println(name.charAt(p));
System.out.println(name.compareTo("hellow How Are You"));
System.out.println(name.compareToIgnoreCase("HELLOW HOW ARE YOU"));
System.out.println(name.concat(" Srinivas"));
System.out.println("Kunchala, ".concat(name));
System.out.println(name.toLowerCase());
System.out.println(name.toUpperCase());
}
}
2 Password Comparision Example
import java.util.*;
class Prog2
{
public static void main(String args[])
{
String pwd,rpwd;
int cnt,r;
cnt=1;
Scanner in=new Scanner(System.in);
do {
System.out.println("Enter Password : ");
pwd=in.next();
System.out.println("Re-Type Password : ");
rpwd=in.next();
r=pwd.compareTo(rpwd);
if(r==0)
{
System.out.println("Passwors is Success");
}
else
{
System.out.println("Password Not Match Try Again !");
}
cnt+=1;
} while (r!=0 && cnt<=3);
if(r!=0 && cnt>0)
{
System.out.println("Your Attempts is completed. Try again after 30 Minutes!");
}
}
}
3 Character and String functions
class Prog3
{
public static void main(String args[])
{
String name="SrinivasaRao",name1=" SrinivasaRao ";
System.out.println(name.length());
System.out.println(name.charAt(0));
System.out.println(name.indexOf('S'));
System.out.println(name.substring(3));
System.out.println(name.substring(3,6));
System.out.println(name.toLowerCase());
System.out.println(name.toUpperCase());
System.out.println("Rama is a good boy".replace("good","bad"));
System.out.println(name.equals("SrinivasaRao"));
System.out.println(name.equalsIgnoreCase("srinivasarao"));
System.out.println(name.concat(" Garu"));
System.out.println(name1.trim());
System.out.println(name.endsWith("Rao"));
System.out.println(name.startsWith("Sri"));
}
}
4 String Tokenizer
//String Tokens
import java.util.Scanner;
import java.util.StringTokenizer;
public class Prog4 {
public static void main(String args[]) {
String name;
Scanner in = new Scanner(System.in);
name = in.nextLine();
StringTokenizer st = new StringTokenizer(name);
while (st.hasMoreTokens()) {
System.out.println(st.nextToken());
}
}
}
5 Math Functions
/*Math Functions*/
class Prog5
{
public static void main(String args[])
{
int a = 28,b= 4;
double r;
System.out.println("Maximum number of a and b is: " + Math.max(a, b));
r= Math.sqrt(b);
System.out.println("Square root of b is: " +r);
System.out.println("Power of x and b is: " + Math.pow(a, b));
System.out.println("Logarithm of a is: " + Math.log(a));
System.out.println("Logarithm of b is: " + Math.log(b));
System.out.println("log10 of a is: " + Math.log10(a));
System.out.println("log10 of b is: " + Math.log10(b));
System.out.println("log1p of a is: " + Math.log1p(a)); // return the log of x + 1
System.out.println("exp of a is: " + Math.exp(a));
System.out.println("expm1 of a is: " + Math.expm1(a)); // return (a power of 2)-1
}
}
6 Math Conversion Functions
class Prog6
{
public static void main(String args[])
{
double angle=30;
System.out.println("Degree to Radiuns is: " + Math.toRadians(angle));// converting values to radian
System.out.println("Degree to Radiuns is: " + Math.round(Math.toRadians(angle)));// converting values to radian
System.out.println("Sine value of a is: " + Math.sin(angle));
System.out.println("Cosine value of a is: " +Math.cos(angle));
System.out.println("Tangent value of a is: " +Math.tan(angle));
System.out.println("A Sine value of a is: " +Math.asin(angle));
System.out.println("A Cosine value of a is: " +Math.acos(angle));
System.out.println("A Tangent value of a is: " +Math.atan(angle));
System.out.println("H Sine value of a is: " +Math.sinh(angle));
System.out.println("H Cosine value of a is: " +Math.cosh(angle));
System.out.println("H Tangent value of a is: " +Math.tanh(angle));
}
}
7 Math Formatting Functions
import java.text.DecimalFormat;
class Prog7
{
public static DecimalFormat df=new DecimalFormat("00.000");
public static void main(String args[])
{
double d=456.55656;
System.out.println("Absolute value of a is: " + Math.abs(-456));// converting values to radian
System.out.println("Max value of a is: " +Math.max(45,56));
System.out.println("Min value of a is: " +Math.min(45,56));
System.out.println("SQrt value of a is: " +Math.sqrt(12));
System.out.println("Cubic Root value of a is: " +Math.cbrt(12));
System.out.println("power value of a is: " +Math.pow(2,2));
System.out.println("sign value of a is: " +Math.signum(-456));
System.out.println("Ceil value of a is: " +Math.ceil(45.56f));
System.out.println("Floor value of a is: " +Math.floor(45.56f));
System.out.println("Round" + df.format(d));
}
}
Vectors
1 Vector Example
import java.util.*;
class Prog1
{
public static void main(String args[])
{
Scanner in=new Scanner(System.in);
int i,n,p;
String name[],element;
Vector vector=new Vector();
System.out.println("Enter n vaule");
n=in.nextInt();
System.out.println("Enter " + n + " Elements");
for(i=0;i<n;i++)
{
element=in.next();
vector.addElement(element);
}
for(i=0;i<vector.size();i++)
{
System.out.println((i + 1) + ")" + vector.elementAt(i));
}
System.out.println("Which position you want add element");
p=in.nextInt();
element=in.next();
vector.insertElementAt(element,p);
System.out.println("After Inserting Elements are");
for(i=0;i<vector.size();i++)
{
System.out.println((i + 1) + ")" + vector.elementAt(i));
}
System.out.println("Which position you want remove element");
p=in.nextInt();
vector.removeElementAt(p);
System.out.println("After Removing Elements are");
for(i=0;i<vector.size();i++)
{
System.out.println((i + 1) + ")" + vector.elementAt(i));
}
name=new String[vector.size()];
vector.copyInto(name);
vector.removeAllElements();
System.out.println("The String elements are");
for(i=0;i<name.length;i++)
{
System.out.println((i+1) + ")" + name[i]);
}
}
}
Multi Thread
Example 1
/*
What is multithread ?
multithread is a separate program.
A Single processor can do the multple programs simultaneously.
it executes concurrently or parallely depends upon the system speed.
In Operating system we are calling Multitasking
In Programming Languages we are calling Multithrading
*/
class Prog1 extends Thread
{
public void run()
{
try
{
System.out.println("\nMy First Thread is Started");
for(int i=1;i<=5;i++)
{
System.out.println("\ni=" + i);
if(i==1 || i==3)
{
sleep(1000);
}
}
System.out.println("\nThread is Completed");
}
catch(Exception e)
{
System.out.println(e);
}
}
public static void main(String args[])
{
Prog1 mt=new Prog1 ();
mt.start();
System.out.println("The Above thread is started");
}
}
Example 2
class Count extends Thread {
Count() {
start();
}
public void run() {
try {
for (int i = 0; i < 10; i++) {
System.out.println("Printing the count " + i);
Thread.sleep(1000);
}
} catch (InterruptedException e) {
System.out.println("my thread interrupted");
}
System.out.println("Thread run is Complete");
}
}
class Prog2 {
public static void main(String args[]) {
Count cnt = new Count();
// cnt.start();
try {
while (cnt.isAlive()) {
System.out.println("Thread will be alive till the child thread is live");
Thread.sleep(3000);
}
} catch (InterruptedException e) {
System.out.println("Main thread interrupted");
}
System.out.println("Main thread's run is over");
}
}
Example 3
class MultiThread implements Runnable
/*class MultiThread extends Thread*/
{
public void run()
{
try
{
System.out.println("Thread is in running Start.");
for(int i=1;i<=5;i++)
{
System.out.println("I=" + i);
Thread.sleep(1000);
}
}
catch(Exception e)
{
System.out.println(e);
}
}
}
class Prog3
{
public static void main(String args[])
{
MultiThread mt=new MultiThread();
Thread newobj =new Thread(mt);
/*MultiThread newobj=new MultiThread();*/
newobj.start();
}
}
Exampl 4 Runnable
class Count implements Runnable
//class Count extends Thread
{
Thread mythread=new Thread(this, "Child Thread");
Count()
{
mythread.start();
}
public void run()
{
try
{
for (int i=0 ;i<10;i++)
{
System.out.println("Printing the count " + i);
Thread.sleep(1000);
}
}
catch(InterruptedException e)
{
System.out.println("my thread interrupted");
}
System.out.println("mythread run is over" );
}
}
class Prog4
{
public static void main(String args[])
{
Count cnt = new Count();
// Thread mythread=new Thread(cnt);
// mythread.start();
try
{
while(cnt.mythread.isAlive())
{
System.out.println("Thread will be alive till the child thread is live");
Thread.sleep(3000);
}
}
catch(InterruptedException e)
{
System.out.println("Thread interrupted");
}
System.out.println("Thread run is over" );
}
}
5 Thread Priority
class ThreadA extends Thread
{
public void run()
{
try
{
System.out.println("\nThread A is running Start.");
for(int i=1;i<=5;i++)
{
System.out.println("\nThread A=" + i);
}
System.out.println("\nThread A Closed");
}
catch(Exception e)
{
System.out.println(e);
}
}
}
class ThreadB extends Thread
{
public void run()
{
try
{
System.out.println("\nThread B is running Start.");
for(int i=1;i<=5;i++)
{
System.out.println("\nThread B=" + i);
}
System.out.println("\nThread B Closed");
}
catch(Exception e)
{
}
}
}
class ThreadC extends Thread
{
public void run()
{
try
{
System.out.println("\nThread C is running Start.");
for(int i=1;i<=5;i++)
{
System.out.println("\nThread C=" + i);
}
System.out.println("\nThread C Closed");
}
catch(Exception e)
{
}
}
}
class Prog5
{
public static void main(String args[])
{
try
{
ThreadA a=new ThreadA();
ThreadB b=new ThreadB();
ThreadC c=new ThreadC();
a.setPriority(Thread.MIN_PRIORITY);
b.setPriority(Thread.MAX_PRIORITY);
c.setPriority(Thread.NORM_PRIORITY);
System.out.println(a.getPriority());
System.out.println(b.getPriority());
System.out.println(c.getPriority());
a.start();
b.start();
c.start();
}
catch(Exception ex)
{
System.out.println(ex);
}
}
}