javaweb寫個隨機點名的代碼

//首先我們可以先把名字搞成一個數(shù)組，或者List都是可以的。

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String[]?arr?=?{"張三","李四","王五","xxx"....};

String?random?=?arr[new?Random().nextInt(arr.size())];

System.out.println("隨機名字為："+random);

Java求助 ，Java用Scanner以及遍歷數(shù)組還有for循環(huán)寫一個隨機點名的代碼？

import java.io.BufferedInputStream;import java.util.Scanner; public class test1 { public static void main(String[] args) { Scanner cin = new Scanner(new BufferedInputStream(System.in)); int n = cin.nextInt(); // 輸入n個數(shù) int[] a = new int[n]; for (int i = 0; i n; ++i) { a[i] = cin.nextInt(); } cin.close(); for (int i = a.length - 1; i = 0; --i) { // 逆序輸出 System.out.print(a[i] + " "); } }}

隨機點名系統(tǒng) java

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("開始點名");

but.setBounds(100,150,100,40);

but.addActionListener(this);

label = new JLabel("隨機點名");

label.setBounds(60,20,300,40);

label.setFont(new Font("楷體",Font.BOLD,40));

show = new JLabel("");

show.setBounds(110,80,200,30);

show.setFont(new Font("楷體",Font.BOLD,30));

reset = new JButton("重新點名");

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("點名");

setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

}

public void initListDate(){

//在這個地方添加姓名就可以了

list.add("劉天廷");

list.add("孔老二");

list.add("張三");

list.add("李四");

list.add("王五");

list.add("麻六");

list.add("馮七");

list.add("京八");

list.add("茅臺九");

}

public void actionPerformed(ActionEvent e) {

/*確保每人選一次*/

Object obj = e.getSource();

if(obj == but){

if(list.size()==0){

JOptionPane.showMessageDialog(null,"沒有人了！");

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 ListString list = new ArrayListString();

}