编写一个Applet小程序

import java.awt.Graphicsimport java.applet.Appletimport javax.swing.JFramepublic class AppletN extends Applet{public void paint(Graphics g){int sum=0 int row=1, col=1 for(int i=1i<=10i++){int sun=1for(int j=1j<=ij++){sun*=j }sum+=sun g.drawString(i+"!="+sun, 80*col, 40*row) if(++col==4){row++ col=1 }}row++ col=80 g.drawString("1!+2!+..+10!="+sum, col, 40*row) }public static void main(String a[]){JFrame j = new JFrame("AppletN") j.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE) j.setSize(400, 300) j.add(new AppletN()) j.setVisible(true) }}

package 小程序

import java.applet.Applet

import java.awt.*

import java.awt.event.*

public class Sum extends Applet implements ActionListener {

TextField text1, text2, text3

Label lb1, lb2, lb3

public void init() {

text1 = new TextField(25)

text2 = new TextField(25)

text3 = new TextField(25)

lb1 = new Label("请输入第一个整数:")

lb2 = new Label("请输入第二个整数:")

lb3 = new Label("他们的和:")

add(lb1)

add(text1)

add(lb2)

add(text2)

add(lb3)

add(text3)

text1.addActionListener(this)

text2.addActionListener(this)

}

public void paint(Graphics g) {

g.drawString("输出2个数，如果他们的和大于5，则蚂岁哗按回雀搜车键闷行输出他们的和", 10, 100)

}

public void actionPerformed(ActionEvent e) {

if (e.getSource() == text1 || e.getSource() == text2

|| e.getSource() == text3) {

int number1, number2, sum

try {

number1 = Integer.valueOf(text1.getText()).intValue()

number2 = Integer.valueOf(text2.getText()).intValue()

sum = number1 + number2

if (sum >5) {

text3.setText("" + sum)

}

} catch (NumberFormatException event) {

text3.setText("请输入整数")

}

} else {

System.exit(0)

}

}

}

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