源代碼

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

public class Addition1 {

public static void main(String[] args)

{

//

String firstNumber,fuhao, secondNumber;

int number1, // first number to add

number2, // second number to add

fuhao1; //fuhao1 to add;

double sum, subtract,multiply,chu;

// 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" );

// read in operational character from user as a string

fuhao=JOptionPane.showInputDialog("Enter yusuanfu：(1+ 2- 3* 4/)");

number1 = Integer.parseInt( firstNumber );

number2 = Integer.parseInt( secondNumber );

fuhao1=Integer.parseInt( fuhao );

sum = (double)number1 + number2;

subtract=(double

multiply=(double)number1*number2;

chu=(double)number1/number2;

switch(fuhao1)

{

case 1: JOptionPane.showMessageDialog(null, "兩數相加等於 " + sum, "Results",JOptionPane.PLAIN_MESSAGE );break;

case 2: JOptionPane.showMessageDialog(null,"兩數相減等於"+subtract,"Result",JOptionPane.PLAIN_MESSAGE);break;

case 3: JOptionPane.showMessageDialog(null,"兩數相乘等於"+multiply,"Result",JOptionPane.PLAIN_MESSAGE);break;

case 4: JOptionPane.showMessageDialog(null,"兩數相除等於"+chu,"Result",JOptionPane.PLAIN_MESSAGE);break;

default: System.exit( 0 );

}

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

}

}

結果截圖

消息框四則運算