simple java(十一)---application(1)

Write a program to use dialog box to find the difference of two integer numbers.

solution:
如果我地要寫一個program用 dialog box 去揾 2個整數既差..其實很容易...首先我地先可以先用sTRING宣告2個名..比人入數字.,再用int宣告三個名.一個用黎放它們的差..另外2個用黎減.之後用JOptionPane.showInputDialog..叫人入數字..再用JOptionPane.showMessageDialog顯示出來..如下.

import javax.swing.JOptionPane;

public class Subtraction {

public static void main( String args[] ){

String firstNumber;

String secondNumber;

int number1;

int number2;

int difference;

StringfirstNumber =JOptionPane.showInputDialog( "Enter first integer" );

secondNumber=JOptionPane.showInputDialog( "Enter second integer" );

number1 = Integer.parseInt( firstNumber );

number2 = Integer.parseInt( secondNumber );

difference = number1 - number2;

JOptionPane.showMessageDialog(null, "The difference is " + difference, "Results",JOptionPane.PLAIN_MESSAGE );

System.exit( 0 );

} }

Write a program that a user can input the two integers to DOS command prompt. You may use the Scanner class.

solution: 其實呢題同上面做法大致相同..只不過佢要Scanner class,如下.

import java.util.*;

public class Input3 {

public static void main( String args[] ) {

int number1;

int number2;

int difference;

Scanner sc = new Scanner(System.in);

System.out.print("Enter first integer: ");

number1 = sc.nextInt();

System.out.print("Enter second integer: ");

number2 = sc.nextInt();

difference = number1 - number2;

System.out.println("The difference is "+ difference);}

}