Question

随机点名系统 java

Answer 1

import java.awt.Font;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.ArrayList;
import java.util.List;
import java.util.Random;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;

public class test_random extends JFrame implements ActionListener{
public static void main(String[] args) {
test_random t = new test_random();
t.init();
}
public void init(){
initListDate();

but = new JButton("开始点名");
but.setBounds(100,150,100,40);
but.addActionListener(this);

label = new JLabel("随机点名");
label.setBounds(60,20,300,40);
label.setFont(new Font("楷体",Font.BOLD,40));

show = new JLabel("");
show.setBounds(110,80,200,30);
show.setFont(new Font("楷体",Font.BOLD,30));

reset = new JButton("重新点名");
reset.setBounds(203,246,90,25);
reset.addActionListener(this);

add(but);
add(label);
add(show);
add(reset);
setLayout(null);
setVisible(true);
setResizable(false);
setBounds(100,100,300,300);
setTitle("点名");
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
public void initListDate(){
//在这个地方添加姓名就可以了
list.add("刘天廷");
list.add("孔老二");
list.add("张三");
list.add("李四");
list.add("王五");
list.add("麻六");
list.add("冯七");
list.add("京八");
list.add("茅台九");

}
public void actionPerformed(ActionEvent e) {
/*确保每人选一次*/
Object obj = e.getSource();
if(obj == but){
if(list.size()==0){
JOptionPane.showMessageDialog(null,"没有人了！");
return ;
}else{
Random ran = new Random();
int num = ran.nextInt(list.size());
show.setText(list.get(num));
list.remove(num);
}
}
if(obj == reset){
show.setText("");
initListDate();
}
}
private JButton but ;
private JLabel label;
private JLabel show;
private JButton reset;
private List<String> list = new ArrayList<String>();
}

Answer 2

random