Thursday, November 6, 2008

First Java Programs examples

First java programs(Welcome Program)

public class Welcome1 {
public static void main( String args[] )
{
System.out.println( "Welcome to Java Programming!" );
}
}


Printing a line with multiple statements

public class Welcome2 {
public static void main( String args[] )
{
System.out.print( "Welcome to " );
System.out.println( "Java Programming!" );
}
}

Printing multiple lines with a single statement

public class Welcome3 {
public static void main( String args[] )
{
System.out.println( "Welcome\nto\nJava\nProgramming!" );
}
}

Printing multiple lines in a dialog box
import javax.swing.JOptionPane; // import class JOptionPane

public class Welcome4 {
public static void main( String args[] )
{
JOptionPane.showMessageDialog(
null, "Welcome\nto\nJava\nProgramming!" );

System.exit( 0 ); // terminate the program
}
}

An addition program

import javax.swing.JOptionPane; // import class JOptionPane

public class Addition {
public static void main( String args[] )
{
String firstNumber, // first string entered by user
secondNumber; // second string entered by user
int number1, // first number to add
number2, // second number to add
sum; // sum of number1 and number2

// read in first number from user as a string
firstNumber =
JOptionPane.showInputDialog( "Enter first integer" );

// read in second number from user as a string
secondNumber =
JOptionPane.showInputDialog( "Enter second integer" );

// convert numbers from type String to type int
number1 = Integer.parseInt( firstNumber );
number2 = Integer.parseInt( secondNumber );

// add the numbers
sum = number1 + number2;

// display the results
JOptionPane.showMessageDialog(
null, "The sum is " + sum, "Results",
JOptionPane.PLAIN_MESSAGE );

System.exit( 0 ); // terminate the program
}
}

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