做出以下界面
MyFrame类:
package com.itheima;
import javax.swing.*;
import javax.swing.border.EtchedBorder;
import javax.swing.border.TitledBorder;
import java.awt.*;
public class MyFrame extends JFrame{
JPanel panel1,panel2;
JTextField text;
JTextArea area1,area2;
JButton button1,button2;
PoliceListen policeListen;
public MyFrame() {
init();
setVisible(true);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
void init(){
setLayout(new FlowLayout());
text = new JTextField(12);
area1 = new JTextArea(10,12);
area2 = new JTextArea(11,14);
button1 = new JButton("抽取");
button2 = new JButton("清除");
panel1 = new JPanel();
panel1.setBorder(new TitledBorder(new EtchedBorder(),"输入在场观众按回车"));
panel1.setPreferredSize(new Dimension(150,220));
panel1.add(text);
panel1.add(new JScrollPane(area1));
panel2 = new JPanel();
panel2.setBorder(new TitledBorder(new EtchedBorder(),"选取观众人员"));
panel2.setPreferredSize(new Dimension(160,220));
panel2.add(new JScrollPane(area2));
add(panel1);
add(panel2);
add(button1);
add(button2);
policeListen = new PoliceListen();
policeListen.setText(text);
policeListen.setArea1(area1);
policeListen.setArea2(area2);
policeListen.setButton1(button1);
policeListen.setButton2(button2);
text.addActionListener(policeListen);
button1.addActionListener(policeListen);
button2.addActionListener(policeListen);
}
}
PoliceListen类:
package com.itheima;
import javax.swing.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
public class PoliceListen implements ActionListener {
JTextField text;
JTextArea area1,area2;
JButton button1,button2;
public void setArea1(JTextArea area1) {
this.area1 = area1;
}
public void setArea2(JTextArea area2) {
this.area2 = area2;
}
public void setText(JTextField text) {
this.text = text;
}
public void setButton1(JButton button1) {
this.button1 = button1;
}
public void setButton2(JButton button2) {
this.button2 = button2;
}
@Override
public void actionPerformed(ActionEvent e) {
if(e.getSource() == text){
String name = text.getText();
area1.append(name+"\n");
text.setText("");
}
if(e.getSource() == button1){
String perstring = area1.getText();
String personArray[] = perstring.split("\n{1,}");
int index = (int)(Math.random() * personArray.length);
String award = "本次抽取观众人员:" + personArray[index]+"\n"+
"奖励过期的酸奶二十箱。";
area2.setText(award);
}
if(e.getSource() == button2){
text.setText("");
area1.setText("");
area2.setText("");
}
}
}
Main类:
package com.itheima;
public class Main {
public static void main(String[] args) {
MyFrame win = new MyFrame();
win.setBounds(100,100,350,300);
win.setTitle("利用数组随机抽奖幸运观众");
}
}