calculator.java

该源码为JSP的开发案例集锦

package ch4;
public class Calculator
{
	//属性声明
	private String first;//第一个操作数
	private String second;//第二个操作数
	private double result;//操作结果
	private String operator;//操作符
	
	/**
	 *以下是一些属性方法
	 */
	public void setFirst(String first)
	{
		this.first=first;
	}
	public void setSecond(String second)
	{
		this.second=second;
	}
	public void setOperator(String operator)
	{
		this.operator=operator;
	}
	public String getFirst()
	{
		return this.first;
	}
	public String getSecond()
	{
		return this.second;
	}
	public String getOperator()
	{
		return this.operator;
	}
	
	//获得计算结果
	public double getResult()
	{
		return this.result;
	}
	
	/**
	 *根据不同的操作符进行计算
	 */
	public void calculate()
	{
		double one=Double.parseDouble(first);
		double two=Double.parseDouble(second);	
		try
		{		
	         	if(operator.equals("+")) result=one+two;
	         	else if(operator.equals("-"))result=one-two;				
				else if(operator.equals("*"))result=one*two;
				else if(operator.equals("/"))result=one/two;	         
	      }
	      catch(Exception e)
	      {
	      	System.out.println(e);
	      }
	       
      }
}