四则运算----封装

我的结对伙伴是:陈思明   http://www.cnblogs.com/chensiming/

package size;
import java.util.Stack;
public class opt
{
    public int math(String str)
    { 
        String[] operater =new String[20]; 
        String[] number = new String[20]; 
        Stack countStack1 = new Stack(); 
        Stack countStack2 = new Stack(); 
        int result =0; 
        number = str.split("\/|\*|\+|\-"); 
        operater= str.split("\d+"); 
        for(int i = 0; i<number.length;i++)
        { 
            countStack1.push(number[i]); 
            if(i!=number.length-1)
            {
                countStack1.push(operater[i+1]); 
            } 
        } 
        while(!countStack1.isEmpty())countStack2.push(countStack1.pop()); 
        String op;
        while(!countStack2.isEmpty())
        { 
            result=0; 
            op = countStack2.pop().toString(); 
            if(op.equals("*"))
            { 
            result=Integer.parseInt(countStack1.pop().toString())*Integer.parseInt(countStack2.pop().toString()); 
            countStack1.push(result); 
            continue; 
            }
            if(op.equals("/"))
            { 
            result=Integer.parseInt(countStack1.pop().toString())/Integer.parseInt(countStack2.pop().toString()); 
            countStack1.push(result); 
            continue; 
            } 
            countStack1.push(op); 
        }
        while(!countStack1.isEmpty())countStack2.push(countStack1.pop()); 
        while(!countStack2.isEmpty())
        {
            result=0; 
            op = countStack2.pop().toString(); 
            if(op.equals("+"))
            { 
                result=Integer.parseInt(countStack1.pop().toString())+Integer.parseInt(countStack2.pop().toString()); 
                countStack1.push(result); 
                continue; 
            } 
            if(op.equals("-"))
            { 
                result=Integer.parseInt(countStack1.pop().toString())-Integer.parseInt(countStack2.pop().toString()); 
                countStack1.push(result); 
                continue; 
            } 
            countStack1.push(op); 
        }
        return result;
    } 
}

上一次我已经将计算的模块独立出来了,这次将他丢到另一个CLASS里封装了起来,方便测试以及其他用途