JAVA程序设计(15.3)----- 图形用户界面GUI 制作挂钟

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1.自动读取系统时间转换成挂钟，随系统时间走秒的

设置字体 JFrame加入各种组件初始化并调整组件 2D画笔双缓冲监听器 Timer 大概就这些练习吧……

package com.lovo.homework3;import java.awt.BasicStroke;import java.awt.Color;import java.awt.Font;import java.awt.Graphics;import java.awt.Graphics2D;import java.awt.Image;import java.awt.event.ActionEvent;import java.awt.event.ActionListener;import java.awt.image.BufferedImage;import java.text.DecimalFormat;import java.util.Calendar;import javax.swing.JFrame;import javax.swing.JLabel;import javax.swing.Timer;/** * 类：时钟~ 自动读取系统时间 并走秒 * @author Abe * */@SuppressWarnings("serial")public class Clock extends JFrame implements ActionListener {private int[] timeNum = new int[3];private double[] radian = new double[3];private Timer timer;private String str = new String();private JLabel lbl;private Color[] color = { Color.red, Color.BLUE, Color.black };private Image offImage = new BufferedImage(400, 500,BufferedImage.TYPE_INT_RGB);// 双缓冲private JLabel[] lbls = new JLabel[4];public Clock() {this.setTitle("时钟");this.setSize(400, 500);this.setDefaultCloseOperation(EXIT_ON_CLOSE);this.setResizable(false);this.setLocationRelativeTo(null);this.setLayout(null);timer = new Timer(200, this);lbl = new JLabel(str); // 显示数字时间lbl.setFont(new Font("Consolas", Font.PLAIN, 37));lbl.setBounds(120, 400, 400, 50);this.add(lbl);for (int i = 0; i < lbls.length; i++) { // 显示刻度盘的数字lbls[i] = new JLabel(0 + 3 * i + "");lbls[i].setFont(new Font("Consolas", Font.PLAIN, 25));this.add(lbls[i]);}lbls[0].setBounds(190, 50, 50, 50);lbls[1].setBounds(310, 170, 50, 50);lbls[2].setBounds(190, 285, 50, 50);lbls[3].setBounds(70, 170, 50, 50);}@Overridepublic void paint(Graphics g) {Graphics newG = offImage.getGraphics();super.paint(newG);this.draw(newG);g.drawImage(offImage, 0, 0, 400, 500, null);timer.start();}public void draw(Graphics newG) {newG.setColor(Color.black);newG.drawOval(50, 70, 300, 300);// 外圆Graphics2D g2d = (Graphics2D) newG;for (int i = 0; i < timeNum.length; i++) { // 指针g2d.setStroke(new BasicStroke(1 + i * 2));g2d.setColor(color[i]);g2d.drawLine(200, 220,200 + (int) (Math.sin(radian[i]) * (120 - 20 * i)),220 - (int) (Math.cos(radian[i]) * (120 - 20 * i)));}for (int i = 0; i < 60; i++) { // 刻度盘Double radMark = 2 * Math.PI * i / 60;int j;if (i % 5 != 0) {g2d.setStroke(new BasicStroke(1));j = 145;} else {g2d.setStroke(new BasicStroke(5));j = 135;}g2d.drawLine(200 + (int) (Math.sin(radMark) * j),220 - (int) (Math.cos(radMark) * j),200 + (int) (Math.sin(radMark) * 145),220 - (int) (Math.cos(radMark) * 145));}}@Overridepublic void actionPerformed(ActionEvent e) {if (e.getSource() == timer) {Calendar cal = Calendar.getInstance(); // 读取系统时间this.timeNum[0] = cal.get(Calendar.SECOND);this.timeNum[1] = cal.get(Calendar.MINUTE);this.timeNum[2] = cal.get(Calendar.HOUR_OF_DAY);DecimalFormat df = new DecimalFormat("00");str = df.format(timeNum[2]) + ":" + df.format(timeNum[1]) + ":"+ df.format(timeNum[0]);lbl.setText(str);for (int i = 0; i < radian.length; i++) {// 时间换算成弧度if (i < 2) {radian[i] = 2 * Math.PI * timeNum[i] / 60;} else {//小时换算弧度时，加上分钟提供的弧度radian[i] = 2 * Math.PI* (timeNum[i] + timeNum[i - 1] / 60.0) / 12;}}repaint();}}public static void main(String[] args) {new Clock().setVisible(true);}}

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