java随机抽取幸运观众

package tast2;

import java.awt.BorderLayout;

import java.awt.EventQueue;

import javax.swing.JFrame;

import javax.swing.JPanel;

import javax.swing.border.EmptyBorder;

import java.awt.CardLayout;

import javax.swing.JButton;

import java.awt.event.ActionListener;

import java.util.Scanner;

import java.awt.event.ActionEvent;

import javax.swing.JTextField;

import javax.swing.JLabel;

import javax.swing.JOptionPane;

import javax.swing.SwingConstants;

import javax.swing.JTextArea;

import java.awt.event.KeyAdapter;

import java.awt.event.KeyEvent;

public class A2 extends JFrame {

private JPanel contentPane;

private JTextField textField;

/**

* Launch the application.

*/

public static void main(String[] args) {

EventQueue.invokeLater(new Runnable() {

public void run() {

try {

A2 frame = new A2();

frame.setVisible(true);

} catch (Exception e) {

e.printStackTrace();

}

}

});

}

/**

* Create the frame.

*/

public A2() {

setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

setBounds(100, 100, 458, 300);

contentPane = new JPanel();

contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));

setContentPane(contentPane);

contentPane.setLayout(null);

JTextArea textArea = new JTextArea();

JTextArea textArea_1 = new JTextArea();

JLabel label = new JLabel("\u8F93\u5165\u59D3\u540D");

label.setBounds(10, 36, 69, 15);

contentPane.add(label);

JButton btnNewButton = new JButton("\u62BD  \u53D6");

btnNewButton.addActionListener(new ActionListener() {

public void actionPerformed(ActionEvent arg0) {

String[] strArray;

strArray=textArea.getText().split("\n{1,}");

int index = (int)(Math.random()*strArray.length);

textArea_1.append("抽取到幸运观众：\n"+strArray[index]+'\n');

}

});

btnNewButton.setBounds(302, 32, 69, 23);

contentPane.add(btnNewButton);

textField = new JTextField();

textField.addKeyListener(new KeyAdapter() {

@Override

public void keyPressed(KeyEvent e) {

if(e.getKeyChar()!='\n')

return;

String name = textField.getText();

if(name.isEmpty()) {

return;

}

textArea.append(name+'\n');

textField.setText("");

}

});

textField.setBounds(74, 33, 218, 21);

contentPane.add(textField);

textField.setColumns(10);

textArea.setBounds(74, 66, 128, 169);

contentPane.add(textArea);

textArea_1.setBounds(243, 65, 128, 170);

contentPane.add(textArea_1);

     }

}