java实现一个小的时钟（当前时间）

深碍√TFBOYSˉ_ 2022-04-14 06:10 176阅读 0赞

import java.awt.Color;
    import java.awt.Dimension;
    import java.awt.Graphics;
    import java.util.Calendar;
    import java.util.GregorianCalendar;
    import javax.swing.JFrame;
    import javax.swing.JLabel;
    import javax.swing.JPanel;
    import javax.swing.border.*;
    import java.awt.BorderLayout;
    
    public class Clock extends JFrame
    {
    	public Clock()
    	{
    		setLayout(new BorderLayout(20,20));
    		StillClock clocker=new StillClock();
    		Border b=new LineBorder(Color.gray,2);
    		clocker.setBorder(b);
    		JLabel label=new JLabel(clocker.getHour()+":"+clocker.getMinute()+":"+clocker.getSecond());
    		label.setBorder(b);
    		clocker.t1.add(clocker,BorderLayout.CENTER);
    		clocker.t2.add(label,BorderLayout.CENTER);
    		add(clocker.t1,BorderLayout.NORTH);
    		add(clocker.t2,BorderLayout.CENTER);
    		/*
    		 *setLayout(new BorderLayout(20,20));
    		StillClock clocker=new StillClock();
    		add(clocker,BorderLayout.CENTER);
    		JLabel j=new JLabel(clocker.getHour()+":"+clocker.getMinute()+":"+clocker.getSecond(),JLabel.CENTER);
    		j.setFont(new java.awt.Font("Dialog",1,15));
    		add(j,BorderLayout.SOUTH);
    
    		 */
    	}
    	public static void main(String[] args) 
    	{
    		Clock p=new Clock();
    		p.setTitle("Exercise15_7");
    		p.setSize(300,300);
    		p.setLocationRelativeTo(null);
    		p.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    		p.setVisible(true);
    	}
    }
    class StillClock extends JPanel
    {
    	private int hour;
    	private int minute;
    	private int second;
    	public JPanel t1=new JPanel();
    	public JPanel t2=new JPanel();
    	public StillClock()
    	{
    		setCurrentTime();
    	}
    	public StillClock(int hour,int minute,int second)
    	{
    		this.hour=hour;
    		this.minute=minute;
    		this.second=second;
    	}
    	public int getHour()
    	{
    		return hour;
    	}
    	public void setHour(int hour)
    	{
    		this.hour=hour;
    		repaint();
    	}
    	public int getMinute()
    	{
    		return minute;
    	}
    	public void setMinute(int minute)
    	{
    		this.minute=minute;
    		repaint();
    	}
    	public int getSecond()
    	{
    		return second;
    	}
    	public void setSecond(int second)
    	{
    		this.second=second;
    		repaint();
    	}
    	protected void paintComponent(Graphics g)                  //一般都定义为保护类型
    	{
    		super.paintComponent(g);
    		int clockRadius=(int)(Math.min(getWidth(),getHeight()*0.8*0.5));
    		int x=getWidth()/2;
    		int y=getHeight()/2;
    		g.setColor(Color.blue);
    		g.drawOval(x-clockRadius, y-clockRadius, 2*clockRadius, 2*clockRadius);
    		g.drawString("12",x-5, y-clockRadius+12);
    		g.drawString("9",x-clockRadius+3, y+5);
    		g.drawString("3",x+clockRadius-10, y+3);
    		g.drawString("6",x-3, y+clockRadius-3);
    		int sLength=(int)(clockRadius*0.8);
    		int xSecond=(int)(x+sLength*Math.sin(second*(2*Math.PI/60)));
    		int ySecond=(int)(y-sLength*Math.cos(second*(2*Math.PI/60)));
    		g.setColor(Color.red);
    		g.drawLine(x,y,xSecond,ySecond);
    		int mLength=(int)(clockRadius*0.65);
    		int xMinute=(int)(x+mLength*Math.sin(minute*(2*Math.PI/60)));
    		int yMinute=(int)(y-mLength*Math.cos(minute*(2*Math.PI/60)));
    		g.setColor(Color.blue);
    		g.drawLine(x,y,xMinute,yMinute);
    		int hLength=(int)(clockRadius*0.5);
    		int xHour=(int)(x+hLength*Math.sin((hour%12+minute/60.0)*(2*Math.PI/12)));
    		int yHour=(int)(y-hLength*Math.cos((hour%12+minute/60.0)*(2*Math.PI/12)));
    		g.setColor(Color.green);
    		g.drawLine(x, y, xHour, yHour);
    	}
    	public void setCurrentTime()
    	{
    		Calendar calendar=new GregorianCalendar();
    		this.hour=calendar.get(Calendar.HOUR_OF_DAY);
    		this.minute=calendar.get(Calendar.MINUTE);
    		this.second=calendar.get(Calendar.SECOND);
    	}
    	public Dimension getPreferredSize()
    	{
    		return new Dimension(200,200);
    	}
    }

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[1356686701_2620.png]: https://img-my.csdn.net/uploads/201212/28/1356686701_2620.png