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📁 一个非常有趣的JAVA小程序
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<HTML><HEAD><TITLE>计算器源代码[原创]</TITLE>
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<P><FONT color=#99ccff>import java.awt.*;<BR>import java.awt.event.*;<BR>import 
java.applet.Applet;<BR>public class calculate extends Applet implements 
ActionListener<BR>{<BR>char symbol='\0',PressKey='\0';<BR>double x=0,y=0;<BR>int 
n=0;<BR>boolean a=false,b=false;<BR>String t=null;<BR>TextField result=new 
TextField("0.0");<BR>Button btn0=new Button("0");<BR>Button btn1=new 
Button("1");<BR>Button btn2=new Button("2");<BR>Button btn3=new 
Button("3");<BR>Button btn4=new Button("4");<BR>Button btn5=new 
Button("5");<BR>Button btn6=new Button("6");<BR>Button btn7=new 
Button("7");<BR>Button btn8=new Button("8");<BR>Button btn9=new 
Button("9");<BR>Button btn10=new Button(".");<BR>Button btn11=new 
Button("+");<BR>Button btn12=new Button("-");<BR>Button btn13=new 
Button("*");<BR>Button btn14=new Button("/");<BR>Button btn15=new 
Button("=");<BR>Button btnc=new Button("C");<BR>Button btnce=new 
Button("CE");<BR>Button btnbak=new Button("Backspace");<BR>Button btnmd=new 
Button("%");<BR>Button btnd=new Button("1/x");<BR>Button btnsqrt=new 
Button("sqrt");<BR>Button btnrev=new Button("+/-");<BR>public void 
init()<BR>{<BR>setLayout(null);<BR>result.setEditable(false);<BR>add(result);<BR>result.setBounds(5,0,230,20); 
<BR>add(btn0);<BR>btn0.setBounds(10,135,40,20);<BR>add(btn1);<BR>btn1.setBounds(10,60,40,20);<BR>add(btn2);<BR>btn2.setBounds(55,60,40,20);<BR>add(btn3);<BR>btn3.setBounds(100,60,40,20);<BR>add(btn4);<BR>btn4.setBounds(10,85,40,20);<BR>add(btn5);<BR>btn5.setBounds(55,85,40,20);<BR>add(btn6);<BR>btn6.setBounds(100,85,40,20);<BR>add(btn7);<BR>btn7.setBounds(10,110,40,20);<BR>add(btn8);<BR>btn8.setBounds(55,110,40,20);<BR>add(btn9);<BR>btn9.setBounds(100,110,40,20);<BR>add(btn10);<BR>btn10.setBounds(100,135,40,20);<BR>add(btn11);<BR>btn11.setBounds(145,135,40,20);<BR>add(btn12);<BR>btn12.setBounds(145,110,40,20);<BR>add(btn13);<BR>btn13.setBounds(145,85,40,20);<BR>add(btn14);<BR>btn14.setBounds(145,60,40,20); 
<BR>add(btn15);<BR>btn15.setBounds(190,135,40,20);<BR>add(btnrev);<BR>btnrev.setBounds(55,135,40,20);<BR>add(btnsqrt);<BR>btnsqrt.setBounds(190,60,40,20);<BR>add(btnd);<BR>btnd.setBounds(190,110,40,20);<BR>add(btnmd);<BR>btnmd.setBounds(190,85,40,20); 
<BR>add(btnc);<BR>btnc.setBounds(180,30,50,20);<BR>add(btnce);<BR>btnce.setBounds(125,30,50,20);<BR>add(btnbak);<BR>btnbak.setBounds(35,30,80,20); 
<BR>btn0.addActionListener(this);<BR>btn1.addActionListener(this);<BR>btn2.addActionListener(this);<BR>btn3.addActionListener(this);<BR>btn4.addActionListener(this);<BR>btn5.addActionListener(this);<BR>btn6.addActionListener(this);<BR>btn7.addActionListener(this);<BR>btn8.addActionListener(this);<BR>btn9.addActionListener(this);<BR>btn10.addActionListener(this);<BR>btn11.addActionListener(this);<BR>btn12.addActionListener(this);<BR>btn13.addActionListener(this);<BR>btn14.addActionListener(this);<BR>btn15.addActionListener(this);<BR>btnc.addActionListener(this);<BR>btnce.addActionListener(this);<BR>btnbak.addActionListener(this);<BR>btnsqrt.addActionListener(this);<BR>btnd.addActionListener(this);<BR>btnmd.addActionListener(this);<BR>btnrev.addActionListener(this); 
<BR>setBackground(Color.white); <BR>}<BR>public void actionPerformed(ActionEvent 
e)<BR>{<BR>if(e.getSource()==btnc)<BR>{<BR>symbol='\0';<BR>x=0;<BR>y=0;<BR>n=0;<BR>a=false;<BR>b=false;<BR>result.setText("0.0");<BR>}<BR>if(e.getSource()==btn0) 
<BR>{<BR>if(n==0)<BR>t=String.valueOf(x);<BR>if(b==true)<BR>x=0;<BR>if(a==false)<BR>{ 
<BR>x*=10;<BR>result.setText(String.valueOf(x));<BR>}<BR>else<BR>{<BR>++n; 
<BR>if(n&gt;1)<BR>t=t+"0";<BR>result.setText(t);<BR>}<BR>}<BR>if(e.getSource()==btn1) 
<BR>{<BR>if(b==true)<BR>x=0;<BR>if(a==false)<BR>{ <BR>x=x*10+1; 
<BR>result.setText(String.valueOf(x));<BR>b=false;<BR>}<BR>else<BR>{<BR>++n;<BR>x=x+Math.pow(10,-n)*1;<BR>x=((double)Math.round(x*(1e+13)))/(1e+13);<BR>result.setText(String.valueOf(x));<BR>}<BR>t=String.valueOf(x);<BR>} 
<BR>if(e.getSource()==btn2) 
<BR>{<BR>if(b==true)<BR>x=0;<BR>if(a==false)<BR>{<BR>x=x*10+2;<BR>result.setText(String.valueOf(x));<BR>b=false;<BR>}<BR>else<BR>{<BR>++n;<BR>x=x+Math.pow(10,-n)*2;<BR>x=((double)Math.round(x*(1e+13)))/(1e+13);<BR>result.setText(String.valueOf(x));<BR>}<BR>t=String.valueOf(x);<BR>} 
<BR>if(e.getSource()==btn3) <BR>{<BR>if(b==true)<BR>x=0;<BR>if(a==false)<BR>{ 
<BR>x=x*10+3;<BR>result.setText(String.valueOf(x));<BR>b=false;<BR>}<BR>else<BR>{<BR>++n;<BR>x=x+Math.pow(10,-n)*3;<BR>x=((double)Math.round(x*(1e+13)))/(1e+13);<BR>result.setText(String.valueOf(x));<BR>}<BR>t=String.valueOf(x);<BR>} 
<BR>if(e.getSource()==btn4) <BR>{ 
<BR>if(b==true)<BR>x=0;<BR>if(a==false)<BR>{<BR>x=x*10+4;<BR>result.setText(String.valueOf(x));<BR>b=false;<BR>}<BR>else<BR>{<BR>++n;<BR>x=x+Math.pow(10,-n)*4;<BR>x=((double)Math.round(x*(1e+13)))/(1e+13);<BR>result.setText(String.valueOf(x));<BR>}<BR>t=String.valueOf(x);<BR>} 
<BR>if(e.getSource()==btn5) <BR>{<BR>if(b==true)<BR>x=0;<BR>if(a==false)<BR>{ 
<BR>x=x*10+5;<BR>result.setText(String.valueOf(x));<BR>b=false;<BR>}<BR>else<BR>{<BR>++n;<BR>x=x+Math.pow(10,-n)*5;<BR>x=((double)Math.round(x*(1e+13)))/(1e+13);<BR>result.setText(String.valueOf(x));<BR>}<BR>t=String.valueOf(x);<BR>} 
<BR>if(e.getSource()==btn6) <BR>{<BR>if(b==true)<BR>x=0;<BR>if(a==false)<BR>{ 
<BR>x=x*10+6;<BR>result.setText(String.valueOf(x));<BR>b=false;<BR>}<BR>else<BR>{<BR>++n;<BR>x=x+Math.pow(10,-n)*6;<BR>x=((double)Math.round(x*(1e+13)))/(1e+13);<BR>result.setText(String.valueOf(x));<BR>}<BR>t=String.valueOf(x);<BR>} 
<BR>if(e.getSource()==btn7) <BR>{<BR>if(b==true)<BR>x=0;<BR>if(a==false)<BR>{ 
<BR>x=x*10+7;<BR>result.setText(String.valueOf(x));<BR>b=false;<BR>}<BR>else<BR>{<BR>++n;<BR>x=x+Math.pow(10,-n)*7;<BR>x=((double)Math.round(x*(1e+13)))/(1e+13);<BR>result.setText(String.valueOf(x));<BR>}<BR>t=String.valueOf(x);<BR>} 
<BR>if(e.getSource()==btn8) <BR>{<BR>if(b==true)<BR>x=0;<BR>if(a==false)<BR>{ 
<BR>x=x*10+8;<BR>result.setText(String.valueOf(x));<BR>b=false;<BR>}<BR>else<BR>{<BR>++n;<BR>x=x+Math.pow(10,-n)*8;<BR>x=((double)Math.round(x*(1e+13)))/(1e+13);<BR>result.setText(String.valueOf(x));<BR>}<BR>t=String.valueOf(x);<BR>} 
<BR>if(e.getSource()==btn9) 
<BR>{<BR>if(n==0)<BR>t=String.valueOf(x);<BR>if(b==true)<BR>x=0;<BR>if(a==false)<BR>{ 
<BR>x=x*10+9;<BR>result.setText(String.valueOf(x));<BR>b=false;<BR>}<BR>else<BR>{<BR>++n;<BR>x=x+Math.pow(10,-n)*9;<BR>x=((double)Math.round(x*(1e+13)))/(1e+13);<BR>result.setText(String.valueOf(x));<BR>}<BR>t=String.valueOf(x);<BR>} 
<BR>if(e.getSource()==btn10) <BR>{<BR>a=true;<BR>} <BR>if(e.getSource()==btn11) 
<BR>{<BR>n=0;<BR>a=false;<BR>if(symbol=='\0')<BR>{ <BR>y=x; 
<BR>}<BR>else<BR>{<BR>switch(symbol)<BR>{<BR>case 
'+':<BR>y=y+x;<BR>y=((double)Math.round(y*(1e+13)))/(1e+13);<BR>result.setText(String.valueOf(y));<BR>break;<BR>case 
'-':<BR>y=y-x;<BR>y=((double)Math.round(y*(1e+13)))/(1e+13);<BR>result.setText(String.valueOf(y));<BR>break;<BR>case 
'*':<BR>y=y*x;<BR>y=((double)Math.round(y*(1e+13)))/(1e+13);<BR>result.setText(String.valueOf(y));<BR>break;<BR>case 
'/':<BR>if(x!=0)<BR>{<BR>y=y/x;<BR>y=((double)Math.round(y*(1e+13)))/(1e+13);<BR>result.setText(String.valueOf(y));<BR>}<BR>else<BR>result.setText("Error");break; 
<BR>default: break; <BR>}<BR>}<BR>b=true;<BR>symbol='+'; <BR>x=y; <BR>} 
<BR>if(e.getSource()==btn12) <BR>{<BR>n=0;<BR>a=false;<BR>if(symbol=='\0')<BR>{ 
<BR>y=x;<BR>}<BR>else<BR>{<BR>switch(symbol)<BR>{<BR>case 
'+':<BR>y=y+x;<BR>y=((double)Math.round(y*(1e+13)))/(1e+13);<BR>result.setText(String.valueOf(y));<BR>break;<BR>case 
'-':<BR>y=y-x;<BR>y=((double)Math.round(y*(1e+13)))/(1e+13);<BR>result.setText(String.valueOf(y));<BR>break;<BR>case 
'*':<BR>y=y*x;<BR>y=((double)Math.round(y*(1e+13)))/(1e+13);<BR>result.setText(String.valueOf(y));<BR>break;<BR>case 
'/':<BR>if(x!=0)<BR>{<BR>y=y/x;<BR>y=((double)Math.round(y*(1e+13)))/(1e+13);<BR>result.setText(String.valueOf(y));<BR>}<BR>else<BR>result.setText("Error");break; 
<BR>default: break; <BR>}<BR><BR>}<BR>b=true;<BR>symbol='-';<BR>x=y; <BR>} 
<BR>if(e.getSource()==btn13) <BR>{<BR>n=0;<BR>a=false;<BR>if(symbol=='\0')<BR>{ 
<BR>y=x;<BR>}<BR>else<BR>{<BR>switch(symbol)<BR>{<BR>case 
'+':<BR>y=y+x;<BR>y=((double)Math.round(y*(1e+13)))/(1e+13);<BR>result.setText(String.valueOf(y));<BR>break;<BR>case 
'-':<BR>y=y-x;<BR>y=((double)Math.round(y*(1e+13)))/(1e+13);<BR>y=((double)Math.round(y*(1e+13)))/(1e+13);<BR>result.setText(String.valueOf(y));<BR>break;<BR>case 
'*':<BR>y=y*x;<BR>y=((double)Math.round(y*(1e+13)))/(1e+13);<BR>result.setText(String.valueOf(y));<BR>break;<BR>case 
'/':<BR>if(x!=0)<BR>{<BR>y=y/x;<BR>y=((double)Math.round(y*(1e+13)))/(1e+13);<BR>result.setText(String.valueOf(y));<BR>}<BR>else<BR>result.setText("Error");break; 
<BR>default: break; <BR>}<BR>}<BR>b=true; <BR>symbol='*';<BR>x=y; <BR>} 
<BR>if(e.getSource()==btn14) 
<BR>{<BR>n=0;<BR>a=false;<BR>if(symbol=='\0')<BR>{<BR>y=x;<BR>}<BR>else<BR>{<BR>switch(symbol)<BR>{<BR>case 
'+':<BR>y=y+x;<BR>y=((double)Math.round(y*(1e+13)))/(1e+13);<BR>result.setText(String.valueOf(y));<BR>break;<BR>case 
'-':<BR>y=y-x;<BR>y=((double)Math.round(y*(1e+13)))/(1e+13);<BR>y=((double)Math.round(y*(1e+13)))/(1e+13);<BR>result.setText(String.valueOf(y));<BR>break;<BR>case 
'*':<BR>y=y*x;<BR>y=((double)Math.round(y*(1e+13)))/(1e+13);<BR>result.setText(String.valueOf(y));<BR>break;<BR>case 
'/':<BR>if(x!=0)<BR>{<BR>y=y/x;<BR>y=((double)Math.round(y*(1e+13)))/(1e+13);<BR>result.setText(String.valueOf(y));<BR>}<BR>else<BR>result.setText("Error");break; 
<BR>default: break; <BR>}<BR>}<BR>symbol='/';<BR>b=true;<BR>x=y; <BR>} 
<BR>if(e.getSource()==btn15)
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