 # Java Programming Code Examples

## Java > Mathematics Code Examples

### Simple Mathematical Calculations

``` Simple Mathematical Calculations // Exercise 3.12 Solution: Multiples.java // Given two doubles as input, the program determines if the first// is a multiple of the second. // Java core packages import java.awt.Graphics; // import class Graphics // Java extension packages import javax.swing.*; // import package javax.swing public class Multiples extends JApplet { String result; // output display String // initialize applet by obtaining values from user public void init() { String firstNumber; // first String entered by user String secondNumber; // second String entered by user double number1; // first number to compare double number2; // second number to compare // read first number from user as a String firstNumber = JOptionPane.showInputDialog( "Enter first floating-point number:" ); // read second number from user as a String secondNumber = JOptionPane.showInputDialog( "Enter second floating-point number:" ); // convert numbers from type String to type double number1 = Double.parseDouble( firstNumber ); number2 = Double.parseDouble( secondNumber ); if ( number1 % number2 == 0 ) result = number1 + " is a multiple of " + number2; if ( number1 % number2 != 0 ) result = number1 + " is not a multiple of " + number2; } // end method init // draw results on applet's background public void paint( Graphics g ) { // draw result as a String at (25, 25) g.drawString( result, 25, 25 ); } // end method paint } // end class OddEven ```