简单计算器

[java]代码库
import java.io.*;
import java.text.Format;
import java.text.NumberFormat;
import java.awt.*;
import java.awt.event.*;
public class Calc {
    public static void main(String[] args){
        CalcFrame CF = new CalcFrame();
        }
} 
 
class CalcFrame extends Frame{
 
    public TextField inputArea = new TextField(30);
    Panel p1 = new Panel(),p2 = new Panel();
    boolean dotFg = false;    //记录有没有按下小数点
    boolean opFlag =false;
    double d1,d2;//两操作 数
    int whichSymbol =0;
    int dfg = 1;
        numButton b1 = new numButton("1")
        ,b2 = new numButton("2")
        ,b3 = new numButton("3")
        ,b4 = new numButton("4")
        ,b5 = new numButton("5")
        ,b6 = new numButton("6")
        ,b7 = new numButton("7")
        ,b8 = new numButton("8")
        ,b9 = new numButton("9")
        ,b0 = new numButton("0");
         
        zfButton bzf= new zfButton("-");
       dotButton dot = new dotButton(".");
       basCalButton  add = new basCalButton("+")
                    ,sub = new basCalButton("-")
                    ,mul = new basCalButton("*")
                    ,div = new basCalButton("/");
       funCalButton sqrt = new funCalButton("sqrt")
                    ,sin = new funCalButton("sin")
                    ,cos = new funCalButton("cos")
                    ,power = new funCalButton("power")
                    ,ln = new funCalButton("ln");
       clearButton1  ce = new clearButton1("CE");
       clearButton2  back = new clearButton2("<-"); 
       resultButton equal = new resultButton("=");
     
  public CalcFrame(){
         
        super("Calculator");
        setLayout(new FlowLayout());
        setBackground(Color.lightGray);
        setSize(250,180);
        setVisible(true);
        inputArea.setBackground(Color.white);
        p1.setBackground(Color.white);
        p1.setSize(100,100);
        p1.setLayout(new GridLayout(4,3));
        p1.add(b1);
        p1.add(b2);
        p1.add(b3);
        p1.add(b4);
        p1.add(b5);
        p1.add(b6);
        p1.add(b7);
        p1.add(b8);
        p1.add(b9);
        p1.add(b0);
        p1.add(bzf);
        p1.add(dot);
        p2.setBackground(Color.white);
        p2.setSize(100,100);
        p2.setLayout(new GridLayout(4,3));
        p2.add(div);
        p2.add(sqrt);
        p2.add(ln);
        p2.add(mul);
        p2.add(sin);
        p2.add(back);
        p2.add(sub);
        p2.add(cos);
        p2.add(ce);
        p2.add(add);
        p2.add(power);
        p2.add(equal);
         
        add("North",inputArea);
        add(p1);
        add(p2);
         
        addWindowListener(new WindowAdapter(){
            public void windowClosing(WindowEvent e){
                System.exit(0);}
            });
    }
     
       
   
  class numButton extends Button implements ActionListener{   //数字键类 
            public String s1;
            public numButton(String s){
                super(s);
                s1 =s;
                setBackground(Color.cyan);
                addActionListener(this);
            }
              
            public void actionPerformed(ActionEvent e) {  //重写响应单击操作
                    if( inputArea.getText().equals("0.0")||opFlag )
                    {
                        inputArea.setText("");
                        opFlag = false;
                    }
                    String temp = inputArea.getText();
                    inputArea.setText("");
                    inputArea.setText(temp+s1);
                    
                
            }
         
         }
 class zfButton extends Button implements ActionListener{  //正负键 
            public String s1;
            static final int flag = 0;
            public zfButton(String s){
                super(s);
                s1 =s;
                setBackground(Color.cyan);
                addActionListener(this);
            }
              
            public void actionPerformed(ActionEvent e) {  //重写响应单击操作
                 
               String temp = inputArea.getText();
               if(!dotFg)
               inputArea.setText("");
               inputArea.setText("-"+temp);
               
                 
             }
         
         }
       class dotButton extends Button implements ActionListener{
           public String s1;
           public dotButton(String s){
                super(s);
                s1 =s;
                setBackground(Color.cyan);
                addActionListener(this);
            }
              
            public void actionPerformed(ActionEvent e) {  //重写响应单击操作
                dotFg = true;
                String temp = inputArea.getText();
                if(temp.equals(""))
                 inputArea.setText("0.");
                else{
                inputArea.setText(temp+".");
                 
             }
                 
             }
       }
       class basCalButton extends Button implements ActionListener{
           public String s1;
           public basCalButton(String s){
                super(s);
                s1 =s;
                setBackground(Color.cyan);
                addActionListener(this);
            }
              
            public void actionPerformed(ActionEvent e) {  //重写响应单击操作
                 opFlag =true;
                 d1 = Double.parseDouble(inputArea.getText());
                inputArea.setText("");
                if(s1.equals("+"))
                    whichSymbol = 1;
                else if(s1.equals("-"))
                    whichSymbol  = 2;
                else if(s1.equals("*"))
                     whichSymbol = 3;
                else if(s1.equals("/"))
                    whichSymbol = 4 ;       
                    }
       }
     class funCalButton extends Button implements ActionListener{
           public String s1;
           public funCalButton(String s){
                super(s);
                s1 =s;
                setBackground(Color.cyan);
                addActionListener(this);
            }
              
            public void actionPerformed(ActionEvent e) {  //重写响应单击操作
               double temp = Double.parseDouble(inputArea.getText());
               if(s1.equals("sqrt"))
                 temp = Math.sqrt(temp*3.14159/180);
               else if(s1.equals("sin"))
                 temp = Math.sin(temp*3.14159/180);
               else if(s1.equals("cos"))
                 temp = Math.cos(temp*3.14159/180);
               else if(s1.equals("power"))
                { opFlag =true;
                whichSymbol = 5;
                d1 = temp;
                inputArea.setText("");
               }
               else if(s1.equals("ln"))
                 temp = Math.log(temp);
                 inputArea.setText(String.valueOf(temp));
             }
       }
       class clearButton1 extends Button implements ActionListener{
           public String s1;
           public clearButton1(String s){
                super(s);
                s1 =s;
                setBackground(Color.cyan);
                addActionListener(this);
            }
              
            public void actionPerformed(ActionEvent e) {  //重写响应单击操作
             inputArea.setText("");
             d1 =0;
             d2 =0;
             dotFg = false;
             whichSymbol = 0;
             opFlag =false;
             }
       }
       class clearButton2 extends Button implements ActionListener{
           public String s1;
           public clearButton2(String s){
                super(s);
                s1 =s;
                setBackground(Color.cyan);
                addActionListener(this);
            }
              
            public void actionPerformed(ActionEvent e) {  //重写响应单击操作
              String temp,s1;
              temp = inputArea.getText();
              s1 = temp.substring(0, temp.length()-1);
              inputArea.setText(s1);
             }
       }
      class resultButton extends Button implements ActionListener{
           public String s1;
           public resultButton(String s){
                super(s);
                s1 =s;
                setBackground(Color.cyan);
                addActionListener(this);
            }
              
            public void actionPerformed(ActionEvent e) {  //重写响应单击操作
                double result = 0;
                d2 = Double.parseDouble(inputArea.getText());
                switch(whichSymbol){
                case 1:
                    result = d1 + d2;
                    break;
                case 2:
                    result = d1 - d2;
                    break;
                case 3:
                    result = d1 * d2;
                    break;
                case 4:
                    result = d1 / d2;
                    break;
                case 5:
                    result = Math.pow(d1,d2);
                 
                }
 
                NumberFormat form = NumberFormat.getIntegerInstance();
                form.setMinimumFractionDigits(8);
                String is = form.format(result);
                inputArea.setText(is);
                    d1 = 0;
                    d2 = 0;
                    dotFg = false;
                    whichSymbol = 0;
                    opFlag =false;
             }
       }
        
       
}
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