Question

java随机点名系统

这是我写的一个随机点名系统的gui，因为是刚学，错的一塌糊涂，希望哪位高手帮我看下

import java.awt.*;
import java.util.*;
public class RandomClassgui extends WindowAdapter implements ActionListener{
Frame f = new Frame("点名系统");
Button startB;
public void display() {
f.setSize(300,200);
f.setLocation(200,140);
f.setBackground(Color.lightGray);
startB = new Button("开始点名");
startB.addActionListener(this);
f.addWindowListener(this);
f.setVisible(true);
}
public void actionPerformed(ActionEvent e) {
if(e.getSource()==startB);
String[] namelist={"小明","小白","小黑","小黄","小兰","小草","小丽","兔子","巫妖","船长","剑圣","冰女"};
int randomNum=(int)(Math.random()*namelist.length);
System.out.println(namelist[randomNum]);
}
public static void main(String args[]){
new RandomClassgui().display();
}
}

Answer 1

给楼主改了一下
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowAdapter;

public class RandomClassgui extends WindowAdapter implements ActionListener{
Frame f = new Frame("点名系统");
Button startB;
public void display() {
f.setSize(300,200);
f.setLocation(200,140);
f.setBackground(Color.lightGray);
startB = new Button("开始点名");
startB.addActionListener(this);
f.addWindowListener(this);
f.add(startB);
f.setVisible(true);
}
public void actionPerformed(ActionEvent e) {
if(e.getSource()==startB);
String[] namelist={"小明","小白","小黑","小黄","小兰","小草","小丽","兔子","巫妖","船长","剑圣","冰女"};
int randomNum=(int)(Math.random()*namelist.length);
System.out.println(namelist[randomNum]);
}
public static void main(String args[]){
new RandomClassgui().display();
}
}

其实没有改太多的地方
只是加了一句
f.add(startB);