Computng the area of circumference usign java

This program in java will compute the area of circumference .

Simple String program

import java.io.*;

public class javastring sample
{
public static void main(String args[])
{
/* string in java represents the character sequence */

/* create string empty*/

String s1=new String(" ");

/* create new string object whose content whose content whould be "Hello world"*/
String S2=new String("Hello World");


/* getting the length of the string */

System.out.print(s2.length());



}
}

String Manipulation

String manipulation using for loop.

sample program:
this program will show result asterisk triangle.
*
**
***
****

import java.io.*;

public class trian
{
public static void main(String args[])
{
int x=1;
int y=1;
for(x=1; x<4; y="1;">{
System.out.print("*");
}
System.out.print("\n");
}
}
}

Compute two numbers in java using user input

this program will ask the user to input two numbers and get the sum.

import java.io.*;
import java.util.Scanner;

public class getsum
{
public static void main(String args[])
{

Scanner input=new Scanner(System.in);
int num1,num2;
int sum=0;

System.out.print("Enter First Number:");
num1=input.nextInt();

System.out.print("Enter Second Number:");
num2=input.nextInt();

sum=num1+num2;

System.out.print("The sum is:" + sum);


}
}

user input in java

The program will ask the user to input name, address and the program will show what they input.

we use here the namespace which is the util.scanner.

User input in java using string;

name of java file: javainput

Sample program:

import java.util.scanner;

public class javainput

{

public static void main(String args[])

{

Scanner input=new Scanner(System.in);

//declaration

String name,address;

System.out.println("Enter your name:");

name=input.next();

System.out.println("Enter your name:");

address=input.next();

//displaying the result

System.out.print("Your Name:" + name);

System.out.print("Your Name:" + add);

}

}

String in Java

he String class represents character strings. All string literals in Java programs, such as "abc", are implemented as instances of this class.

Strings are constant; their values cannot be changed after they are created. String buffers support mutable strings. Because String objects are immutable they can be shared. For example:

     String str = "abc";  

sample program.

import java.io.*;

public class stringsample

{

public static void main(String args[])

{

System.out.print("Hello World");

System.out.print("Welcome to my String Java program");

}

}

while loop sample program

import java.io*;

public class loopwhile
{
public static void main(String args[])
{
int x=1;
while(x<=10)
{
System.out.print(x);
x++;
}
}
}