//  Welcome1.java

// A first program in Java

 

public class Welcome1 {

   public static void main( String args[] )

   {

      System.out.println( "Welcome to Java Programming!" );

   }

}

 

//  Welcome2.java

// 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!" );

   }

}

 

//  Welcome3.java

// Printing multiple lines with a single statement

 

public class Welcome3 {

   public static void main( String args[] )

   {

      System.out.println( "Welcome\nto\nJava\nProgramming!" );

   }

}

//  Welcome4.java

// 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

   }

}

 

 

 

 

 

 // Addition.java

// 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

   }

}

 

 

 

 

 

 

 

 

 

//  Comparison.java

// Using if statements, relational operators,

// and equality operators

 

import javax.swing.JOptionPane;

 

public class Comparison {

   public static void main( String args[] )

   {

      String firstNumber,   // first string entered by user

             secondNumber,  // second string entered by user

             result;        // a string containing the output

      int number1,          // first number to compare

          number2;          // second number to compare

 

      // read first number from user as a string

      firstNumber =

         JOptionPane.showInputDialog( "Enter first integer:" );

 

      // read 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 );

 

      // initialize result to the empty string

      result = "";

 

      if ( number1 == number2 )

         result = number1 + " == " + number2;

 

      if ( number1 != number2 )

         result = number1 + " != " + number2;

 

      if ( number1 < number2 )

         result = result + "\n" + number1 + " < " + number2;

 

      if ( number1 > number2 )

         result = result + "\n" + number1 + " > " + number2;

 

      if ( number1 <= number2 )

         result = result + "\n" + number1 + " <= " + number2;

 

      if ( number1 >= number2 )

         result = result + "\n" + number1 + " >= " + number2;

 

      // Display results

      JOptionPane.showMessageDialog(

         null, result, "Comparison Results",

         JOptionPane.INFORMATION_MESSAGE );

 

      System.exit( 0 );

   }

}