package cn.com.caculate;import java.math.BigDecimal;public class caculate {	private String firstNum="0";	private String secondNum="0";	private char operator='+';	private String result="0";	public String getFirstNum() {		return firstNum;	}	public void setFirstNum(String firstNum) {		this.firstNum = firstNum;	}	public String getSecondNum() {		return secondNum;	}	public void setSecondNum(String secondNum) {		this.secondNum = secondNum;	}		public char getOperator() {		return operator;	}	public void setOperator(char operator) {		this.operator = operator;	}	public String getResult() {		return result;	}	public void setResult(String result) {		this.result = result;	}	public void calculate()	{		BigDecimal first=new BigDecimal(this.firstNum);		BigDecimal second=new BigDecimal(this.secondNum);		switch(this.operator)		{		case '+':			this.result=first.add(second).toString();			break;		case '-':			this.result=first.subtract(second).toString();					break;		case '*':			this.result=first.multiply(second).toString();			break;		case '/':			if(second.doubleValue()==0)			{				throw new RuntimeException("除零异常！");			}			this.result=first.divide(second, 20, BigDecimal.ROUND_HALF_UP).toString();			break;		default:			throw new RuntimeException("操作有错误！");		}	}}<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%><%String path = request.getContextPath();String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";%>                  	
    	
    	
        	
    	
    	
            
      
      <%  try{  	caculate.calculate();   	}   catch(Exception e){   	   	out.write(e.getMessage());   }   %>   
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   	计算结果是：   
       
       
       =   
       
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简单的计算器
  		       
  		       
  			        
第一个数
  			        
  				  			
  		       
  		       
  			        
选择操纵
  			        
	  			 + - * /   			
  		       
  		       
  			        
第二个数