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import java.awt.*;

import java.awt.event.*;

import java.applet.*;

public class Calculator extends Applet implements ActionListener{

int i=0;

String op=" "; //存操作符

double num1=0,num2=0; //存操作数

boolean opr=false,num=false,sta=false,is=false; //设置状态

String btns[]={"7","8","9","/","C","4","5",

"6","X","√","1","2","3","-",

"%","0","+/-",".","+","="};

//设置布局

Panel pan1,pan2; //容器

BorderLayout bg1; //布局

GridLayout bg2;

Label input; //显示

Color c1,c2; //颜色32313133353236313431303231363533e59b9ee7ad9431333262353437变量

Button btn[]=new Button[20]; //按钮

public void init(){ //初始化

input=new Label();

pan1=new Panel();

pan2=new Panel();

bg1=new BorderLayout(0,10);

bg2=new GridLayout(0,5,6,8);

pan2.setLayout(bg2);

pan1.setLayout(bg1);

c1=new Color(151,118,203);

c2=new Color(164,210,249);

for(i=0;i<20;i++){

btn[i]=new Button(btns[i]);

pan2.add(btn[i]);

btn[i].setBackground(c2);

btn[i].addActionListener(this);

}

pan1.add(input,"North");

pan1.add(pan2,"Center");

input.setText("0");

input.setBackground(Color.pink);

input.setAlignment(Label.RIGHT);

this.setBackground(c1);

pan1.setBackground(c1);

add(pan1);

}

还有这个：

/*按0--9的按钮事件*/

else if( click.equals("0")||click.equals("1")||click.equals("2")||click.equals("3")||

click.equals("4")||click.equals("5")||click.equals("6")||click.equals("7")||

click.equals("8")||click.equals("9")){

pressnum(click);

if(op!=(" ")){ //设符号标志位

opr=true;

}

}

else if(click=="+"){ //加法

if(opr==false){

num1=Double.valueOf(input.getText()).doubleValue();

op="+";

num=false;

}

else {

num2=Double.valueOf(input.getText()).doubleValue();

if(op.equals("+")){

num1=num1+num2;

input.setText(isf(num1));

}

else if(op.equals("-")){

num1=num1-num2;

input.setText(isf(num1));

}

else if(op.equals("*")){

num1=num1*num2;

input.setText(isf(num1));

}

else if(op.equals("/")){

if(Double.toString(num2)!="0.0"){

num1=num1/num2;

input.setText(isf(num1));

}

else input.setText("不能用0做除数");

}

op="+";

opr=false;

num=false;

}

}

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