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1、計算器import java.awt.*;import javax.swing.*;public class 計算器 extends JApplet JTextField f=new JTextField(); JButton w=new JButton10; JButton aa=new JButton4; String ss=+,-,*,/; JButton aaa=new JButton(.); JButton aab=new JButton(=); JButton a=new JButton(清空); JLabel q1=new JLabel(); JLabel q2=new JLab

2、el(); JPanel p1=new JPanel(); JPanel p2=new JPanel(); double x=0,y=0,k=0; String t,s=; int ff=0,count=-1; public void init() for(int i=0;i10;i+) wi=new JButton(String.valueOf(i); for(int i=0;i4;i+) aai=new JButton(ssi); this.setLayout(new BorderLayout(); this.add(f, BorderLayout.NORTH); this.add(p1,

3、BorderLayout.CENTER); p1.setLayout(new GridLayout(4,4,3,3); for(int i=7;i=9;i+) p1.add(wi); p1.add(aa0); for(int i=4;i=6;i+) p1.add(wi); p1.add(aa1); for(int i=1;i=3;i+) p1.add(wi); p1.add(aa2); p1.add(w0); p1.add(aaa); p1.add(aab); p1.add(aa3); this.add(p2, BorderLayout.SOUTH); p2.setLayout(new Gri

4、dLayout(1,3); p2.add(q1); p2.add(a); p2.add(q2); for(int i=0;i=9;i+) wi.addActionListener(new A(); for(int i=0;i=3;i+) aai.addActionListener(new A(); aab.addActionListener(new A(); aaa.addActionListener(new A(); a.addActionListener(new A(); class A implements ActionListener public void actionPerform

5、ed(ActionEvent e) if(ff=1) f.setText(); for(int i=0;i=9;i+) if(e.getSource()=wi) if(count=-1) x=x*10+i; s=s+String.valueOf(i); f.setText(s); else k=i; count+; for(int j=1;j=count;j+) k=k*0.1;x=x+k; s=s+String.valueOf(i); f.setText(s); for(int i=0;i=3;i+) if(e.getSource()=aai) t=ssi; y=x; x=0; s=; f.

6、setText(ssi); count=-1; if(e.getSource()=aab) if(t.equals(+) x=x+y; f.setText(String.valueOf(x); if(t.equals(-) x=y-x; f.setText(String.valueOf(x); if(t.equals(*) x=x*y; f.setText(String.valueOf(x); if(t.equals(/) x=y/x; f.setText(String.valueOf(x); ff=1; x=0; y=0; s=; t=; count=-1; if(e.getSource()

7、=aaa) count=0; s=s+.; f.setText(s); if(e.getSource()=a) x=0; y=0; s=; t=; f.setText(); ff=1; count=-1; 時鐘和日期import java.util.*;import java.awt.*;import java.applet.*;import java.text.*;public class Clock_clock extends Applet implements RunnableThread timer=null; int timeout=166;int lxh=0,lyh=0,lxm=0

8、,lym=0,lxs=0,lys=0;Date dummy=new Date();SimpleDateFormat df=new SimpleDateFormat( yyyy/MM/dd HH:mm:ss);String lastdate=df.format(dummy); int x,y;public void paint(Graphics g)int xh,yh,xm,ym,xs,ys;int s=0,m=10,h=10; int cx=80,cy=55;String today; Date dat=new Date();Calendar now=Calendar.getInstance(

9、);h=now.get(Calendar.HOUR_OF_DAY);m=now.get(Calendar.MINUTE);s=now.get(Calendar.SECOND);g.setColor(getBackground();xs=(int)(45*Math.cos(s*Math.PI/30-Math.PI/2)+cx);ys=(int)(45*Math.sin(s*Math.PI/30-Math.PI/2)+cy);xm=(int)(40*Math.cos(m*Math.PI/30-Math.PI/2)+cx);ym=(int)(40*Math.sin(m*Math.PI/30-Math

10、.PI/2)+cy);xh=(int)(30*Math.cos(h*Math.PI/6-Math.PI/2)+cx);yh=(int)(30*Math.sin(h*Math.PI/6-Math.PI/2)+cy);g.setColor(Color.black);g.drawOval(cx-50, cy-50,100,100);g.setColor(Color.blue);g.drawString(9,cx-45,cy+5);g.drawString(3,cx+40,cy+5);g.drawString(12,cx-5,cy-35);g.drawString(6,cx-3,cy+45);df.a

11、pplyPattern( yyyy/MM/dd HH:mm:ss);today=df.format(dat);g.setColor(getBackground();if(xs!=lxs|ys!=lys)g.drawLine(cx, cy, lxs, lys);g.drawString(lastdate,5,135);if(xm!=lxm|ym!=lym)g.drawLine(cx, cy, lxm, lym);if(xh!=lxh|yh!=lyh)g.drawLine(cx, cy, lxh, lyh);g.setColor(Color.blue);g.drawLine(cx,cy,xs,ys);g.setColor(Color.black);g.drawLine(cx, cy, xm, ym);g.drawLine(cx, cy, xh, yh);g.setColor(Color.blue);g.drawString(today,5,135);lxs=xs; lys=ys;lxm=xm;ly