calculator.java

实验软装置（基于表达式的计算器ExprEval） 很不错的 有帮助于学习提高

package parser;
import java.io.*;

import exceptions.*;
public class Calculator {

	Parser myparser;
	public double calculate(String expression) throws ExpressionException
	{
	
		myparser=new Parser();
		try{
		return myparser.calculate(expression);
		}
		catch(IOException e){
			throw new exceptions.EmptyExpressionException(); 
		}
	}
	
	static public void main(String []args) throws IOException,ExpressionException
	{
		Calculator a=new Calculator();

		System.out.print(a.calculate("max(-1,0)>0?5:3>=0?4:5"));
		
	}
}