calculator.java

这是我上学期收集的一些我们班高手的JAVA期末作业的源代码

/**
 *File Name :   Calculator.java
 *Author     :   CaoChunCheng
 *Date       :   2004-04-13
 *Note       :   一个简单的Java Applet计算器
 */
 
 package com.java.calculator;
 
 import java.applet.*;
 import java.awt.*;
 import java.util.*;
 import java.math.*;
 import java.awt.event.ActionListener;
 import java.util.EventListener;
 import java.awt.event.ActionEvent;
 
 
 public class Calculator extends Applet implements ActionListener {
  private CalculatorText tp;
  private CalculatorButton1 bt1;
  private CalculatorButton2 bt2;
  private CalculatorButton3 bt3;
  private String tempText;
  private double operandOne,operandTwo,result;
  private int intFlag;
  private boolean booleanFlag;
  
  	
  public void init()
  { 
    setLayout(null);
    tempText = "";
    this.setBackground(new java.awt.Color(138,200,213));
    booleanFlag = true;
   
    tp=new CalculatorText();
    tp.setBounds(5,5,280,25);
    add(tp);
    
    bt1=new CalculatorButton1();
    bt1.setBounds(5,80,40,200);
    add(bt1);
    
    bt2=new CalculatorButton2();
    bt2.setBounds(60,35,230,35);
    add(bt2);  
  
    bt3=new CalculatorButton3();
    bt3.setBounds(60,80,230,200);
    add(bt3);
    
    bt1.button_addsub().addActionListener(this);
    bt1.getButton_MC().addActionListener(this);
    bt1.getButton_MR().addActionListener(this);
    bt1.getButton_MS().addActionListener(this);
    
    bt2.getButton_Backspace().addActionListener(this);
    bt2.getButton_C().addActionListener(this);
    bt2.getButton_CE().addActionListener(this);
    
    bt3.getButton_0().addActionListener(this);
    bt3.getButton_1().addActionListener(this);
    bt3.getButton_2().addActionListener(this);
    bt3.getButton_3().addActionListener(this);
    bt3.getButton_4().addActionListener(this);
    bt3.getButton_5().addActionListener(this);
    bt3.getButton_6().addActionListener(this);
    bt3.getButton_7().addActionListener(this);
    bt3.getButton_8().addActionListener(this);
    bt3.getButton_9().addActionListener(this);
    
    bt3.getButton_add().addActionListener(this);
    bt3.getButton_sub().addActionListener(this);
    bt3.getButton_div().addActionListener(this);
    bt3.getButton_mul().addActionListener(this);
    bt3.getButton_dived().addActionListener(this);
    bt3.getButton_sqrt().addActionListener(this);
    bt3.getButton_xx().addActionListener(this);
    bt3.getButton_d().addActionListener(this);
    bt3.getButton_result().addActionListener(this);
    bt3.getButton_mark().addActionListener(this);
  }

	public void actionPerformed(ActionEvent e) {
		
		if(e.getSource().equals(bt1.button_addsub())){
			boolean flag = true;
			if(tempText.equals("0")){
			    tempText = "";
			}
			if(tp.getTextField().getText().equals("-") && flag){
				tempText = "";
				tp.getTextField().setText("0");
				flag = false;
			}			
			if(tp.getTextField().getText().equals("") && flag){
				tempText = tempText + "-";
				tp.getTextField().setText(tempText);
				flag = false;
			}
			if(tp.getTextField().getText().equals("0") && flag){
			    tempText = tempText + "-";
			    tp.getTextField().setText(tempText);
			    flag = false;
			}
			if(tempText.substring(0,1).equals("-") && !tempText.substring(1,2).equals("") && flag){
			    tempText = tempText.substring(1,tempText.length());
			    tp.getTextField().setText(tempText);
			    flag = false;
			}
			if(!tp.getTextField().getText().substring(0,1).equals("-") && flag){
			    tempText = "-" + tempText;
			    tp.getTextField().setText(tempText);
			    flag = false;
			}
			
	    }
	    
	    if(e.getSource().equals(bt1.getButton_MC())){
			tp.getTextField().setText("这个功能还没有实现,请见谅!");  
	    }
	    if(e.getSource().equals(bt1.getButton_MR())){
			tp.getTextField().setText("这个功能还没有实现,请见谅!");  
	    }
	    if(e.getSource().equals(bt1.getButton_MS())){
			tp.getTextField().setText("这个功能还没有实现,请见谅!");  
	    }
	    if(e.getSource().equals(bt3.getButton_sqrt())){
	    	if(tp.getTextField().getText().length() != 0){
	    	 this.operandOne = Double.parseDouble(tp.getTextField().getText());
        	  if(this.operandOne >= 0){
        	  	result = Math.sqrt(this.operandOne);
        	  	tempText = "";
        	  	if(String.valueOf(result).substring(String.valueOf(result).length()-2,String.valueOf(result).length()).equals(".0"))
        	     tp.getTextField().setText(String.valueOf(result).substring(0,String.valueOf(result).length()-2));
        	   else
        	     tp.getTextField().setText(String.valueOf(result));
        	  }
	    	}
	    }
	    if(e.getSource().equals(bt2.getButton_CE())){
	    	tp.getTextField().setText("");
	    	tempText = "";
	    	booleanFlag = true;
	    	this.operandTwo = 0;
	    }
	    if(e.getSource().equals(bt2.getButton_C())){
	    	tp.getTextField().setText("0");
	    	tempText = "";
	    	booleanFlag = true;
	    	this.operandTwo = 0;
	    }
	    if(e.getSource().equals(bt2.getButton_Backspace())){
	    	
            String stringTemp =new String(tp.getTextField().getText());
        	int len=stringTemp.length();
        	if(len==0)
        	{
        	 tempText = "";
        	 tp.getTextField().setText(tempText);
            }
        	else
        	{
        	  stringTemp =stringTemp.substring(0,len-1);
        	  tempText = stringTemp;
        	  tp.getTextField().setText(tempText);
            }
	    }
	    if(e.getSource().equals(bt3.getButton_0())){
	      tempText = tempText + "0";
	    	String stringTemp = new String(tp.getTextField().getText());
            if((stringTemp.equals("-0")&&stringTemp.length()==2)||(stringTemp.equals("-00")&&stringTemp.length()==4))
            {                            
              	tempText = "-";
              	tp.getTextField().setText("-0");                             
            }
            if((stringTemp.equals("0")&&stringTemp.length()==1)||(stringTemp.equals("00")&&stringTemp.length()==2))
            {
              	tempText = "";
                tp.getTextField().setText("0");
            }
            if(!(stringTemp.equals("-0")&&stringTemp.length()==2)&&!(stringTemp.equals("-00")&&stringTemp.length()==4)
               &&!(stringTemp.equals("0")&&stringTemp.length()==1)&&!(stringTemp.equals("00")&&stringTemp.length()==2))
            {
              tp.getTextField().setText(tempText);
            }
	    }
	    if(e.getSource().equals(bt3.getButton_1())){
	    	tempText = tempText+"1";
		    if(tempText.substring(0,1).equals("0") && !tempText.substring(0,2).equals("0."))
		       tempText = tempText.substring(1,tempText.length());
		    tp.getTextField().setText(tempText);
	    }
	    if(e.getSource().equals(bt3.getButton_2())){
	    	tempText = tempText+"2";
		    if(tempText.substring(0,1).equals("0") && !tempText.substring(0,2).equals("0."))
		       tempText = tempText.substring(1,tempText.length());
		    tp.getTextField().setText(tempText);
	    }
	    if(e.getSource().equals(bt3.getButton_3())){
	    	tempText = tempText+"3";
		    if(tempText.substring(0,1).equals("0") && !tempText.substring(0,2).equals("0."))
		       tempText = tempText.substring(1,tempText.length());
		    tp.getTextField().setText(tempText);