目的是实现一个具有切换圈圈颜色及标签内容的程序
package com.elyong.noway;
/**
* Created by ely ong on 2017/11/27.
*/
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class TwoButtons{
JFrame frame;
JLabel label;
public static void main(String[] args){
TwoButtons gui=new TwoButtons();
gui.go();
}
public void go(){
frame=new JFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JButton labelButton=new JButton("Change Label");
labelButton.addActionListener(new LabelListener());
JButton colorButton=new JButton("Change Circle");
colorButton.addActionListener(new ColorListener());
label=new JLabel("I'm a label");
MyDrawPanel drawPanel=new MyDrawPanel();
frame.getContentPane().add(BorderLayout.SOUTH,colorButton);
frame.getContentPane().add(BorderLayout.CENTER,drawPanel);
frame.getContentPane().add(BorderLayout.EAST,labelButton);
frame.getContentPane().add(BorderLayout.WEST,label);
frame.setSize(300,300);
frame.setVisible(true);
}
class LabelListener implements ActionListener{
public void actionPerformed(ActionListener event){
label.setText("Ouch!");
}
}
class ColorListener implements ActionListener{
public void actionPerformed(ActionListener event){
frame.repaint();
}
}
}
class MyDrawPanel extends JPanel{
public void paintComponent(Graphics g){
Graphics2D g2d=(Graphics2D) g;
int red=(int)(Math.random()*255);
int green=(int)(Math.random()*255);
int blue=(int)(Math.random()*255);
Color startColor=new Color(red,green,blue);
red=(int)(Math.random()*255);
green=(int)(Math.random()*255);
blue=(int)(Math.random()*255);
Color endColor=new Color(red,green,blue);
GradientPaint gradient=new GradientPaint(70,70,startColor,150,150,endColor);
g2d.setPaint(gradient);
g2d.fillOval(70,70,100,100);
}
}
报错：
Error:(32, 5) java: com.elyong.noway.TwoButtons.LabelListener不是抽象的, 并且未覆盖java.awt.event.ActionListener中的抽象方法actionPerformed(java.awt.event.ActionEvent)
Error:(37, 5) java: com.elyong.noway.TwoButtons.ColorListener不是抽象的, 并且未覆盖java.awt.event.ActionListener中的抽象方法actionPerformed(java.awt.event.ActionEvent)
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