java随机取号器代码 java随机数选择器

如何用java语言编写一个叫学号器，比如班里有五十个同学，按一下按钮，随机叫出一个同学的名字！求详细代

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import javax.swing.*;

public class test extends JFrame{

String[] student;

JLabel jl;

test(String[] s){

student=s;

JPanel jp=new JPanel();

JButton jb=new JButton("叫号");

jl=new JLabel();

jp.add(jb);

jp.add(jl);

this.getContentPane().add(jp);

jb.addActionListener(new ActionListener() {

public void actionPerformed(ActionEvent e) {

jl.setText(student[(int)Math.floor(Math.random()*50)]);

}

});

this.setTitle("叫号器");

this.setSize(200,100);

this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

this.setLocationRelativeTo(null);

this.setVisible(true);

}

public static void main(String[] args)throws Exception {

String[] student=new String[50];

for (int i = 0;i student.length; i++) {

student[i] = "小"+(int)Math.floor(Math.random()*50);

}

new test(student);

}

}

相关问答

Q1: java随机抽号程序

现在的可以了，你试下

import java.awt.BorderLayout;

import java.awt.Color;

import java.awt.Font;

import java.awt.GridLayout;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import javax.swing.JButton;

import javax.swing.JFrame;

import javax.swing.JLabel;

import javax.swing.JPanel;

import javax.swing.JTextField;

import javax.swing.SwingConstants;

public class RandomTest extends JFrame {

private static final long serialVersionUID = 6764423443555437772L;

boolean isStop = false;

private JLabel jl = new JLabel();

private JTextField jt = new JTextField();

private JButton start = new JButton("start");

private JButton stop = new JButton("stop");

private JPanel jp = new JPanel();

public RandomTest() {

this.jl.setHorizontalAlignment(SwingConstants.CENTER);

this.jl.setText("60"); // 设置随机数范围1到60

this.jl.setForeground(Color.red); // 设置字体颜色

this.jl.setFont(new Font("Dialog", 1, 24)); // 设置字体样式、大小

GridLayout layout = new GridLayout(1, 2);

this.add(jl, BorderLayout.NORTH);

this.add(jt, BorderLayout.CENTER);

this.jp.add(start, layout);

this.jp.add(stop, layout);

this.add(jp, BorderLayout.SOUTH);

this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); // 关闭窗口

start.addActionListener(new ActionListener() {

public void actionPerformed(ActionEvent e) {

isStop = false;

JTextThread jtt = new JTextThread(jt);

jtt.start();

}

});

stop.addActionListener(new ActionListener() {

public void actionPerformed(ActionEvent e) {

isStop = true;

}

});

}

public static void main(String[] args) {

RandomTest rt = new RandomTest();

rt.setSize(400, 300);

rt.setLocationRelativeTo(null); // 设置窗口初始位置，屏幕中央

rt.setVisible(true);

}

class JTextThread extends Thread {

private JTextField jt;

public JTextThread(JTextField jt) {

this.jt = jt;

}

@Override

public void run() {

while (!isStop) {

try {

Thread.sleep(100);

int random = (int) (Math.random() * 60 + 1);

jt.setText(String.valueOf(random));

jt.setForeground(Color.blue); // 设置字体颜色

jt.setFont(new Font("Dialog", 1, 48)); // 设置字体样式、大小

jt.setHorizontalAlignment(SwingConstants.CENTER);

} catch (InterruptedException e) {

e.printStackTrace();

}

}

}

}

}

Q2: 使用一个数组保存10个电话号码,使用Random从中随机抽取一个号码显示在控制台上,求高手给java代码！！！

public class Hello{

public static void main(String []args)throws Exception{

String []s=new String[10];

for(int i=0;i10;i++)

s[i]=Integer.toString((int)(Math.random()*100000+1235)*1000+333); //电话号码

System.out.println(s[(int)((Math.random()*100)%10)]);

}

}

//////////////////////////////

import java.io.*;

import java.awt.*;

import java.awt.Event;

import java.util.*;

public class Hello{

public static void main(String []args)throws Exception{

String []s=new String[10];

for(int i=0;i10;i++)

{

BufferedReader br=new BufferedReader(new InputStreamReader(System.in));

System.out.println("输入第"+(i+1)+"个电话号码");

s[i]=br.readLine();

//s[i]=Integer.toString((int)(Math.random()*100000+1235)*1000+333); //电话号码

}

System.out.println(s[(int)((Math.random()*100)%10)]);

}

}

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