学习Java10

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简单的GUI:

import javax.swing.*;import java.awt.event.*;import java.awt.*;public class Day implements ActionListener{JFrame frame;public static void main(String[] args){Day gui =new Day();gui.go();}public void go(){JFrame frame=new JFrame();frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);JButton button=new JButton("Change!");button.addActionListener(this);MyDrawPanel drawPanel= new MyDrawPanel();frame.getContentPane().add(BorderLayout.SOUTH,button);frame.getContentPane().add(BorderLayout.CENTER,drawPanel);frame.setSize(300,300);frame.setVisible(true);}public void actionPerformed(ActionEvent 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); }}

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