expressiondemo.java

使用JAVA语言实现的四则运算(加,减,乘,除运算)

import java.io.*;
import java.lang.*;

public class ExpressionDemo
{
	public static void main(String[] args)
	{
		
		String expression=null;
		
		System.out.println("Please enter the expression:");
		expression = readLineString();
		expression = expression.trim();
		ExpressionList e=new ExpressionList(expression);
	
	 
	}
	
	private static String readLineString()
	{
		String inputString = null;
        
        try{
        	BufferedReader input =
				new BufferedReader(new InputStreamReader(System.in));
        	inputString = input.readLine().trim();
        }
        catch(IOException e)
        {
        	System.out.println("Sorry ,goodbye");
        	System.exit(0);
        }
        return inputString;
     }
}