java笔试题3

题目：从控制台输入 n个表达式，判断哪个表达式绝对值最小。表达式格式：a+b,a*b,a-b,a/b;

这是我自己写的代码，希望和大家交流。

package com.li.test.classes;

/**
 * 从控制台输入 n个表达式，判断哪个表达式绝对值最小。表达式格式：a+b,a*b,a-b,a/b;
 */
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.Stack;

public class Test {

	public String s = "ddd";
	public String getString() {
		BufferedReader bu = new BufferedReader(new InputStreamReader(System.in));
		try {
			s = bu.readLine();
		}
		catch (IOException e) {
			e.getMessage();
		}
		return s;
	}

	public String[] stringToint(String str) {
		return str.split(" ");
	}

	public boolean compare(float a, float b) {
		if (a <= b) {
			return false;
		}
		else {
			return true;
		}
		// return a;
	}

	public int parser(String[] s) {
		float Dvalue = Integer.MAX_VALUE;
		int x = 0;
		Stack stack = new Stack();
		for (int j = 0; j < s.length; j++) {
			String str = s[j];
			char[] chararray = str.toCharArray();
			int index = 1;
			for (int i = 0; i < chararray.length; i++) {
				char c = chararray[i];
				if (!(c >= 48 && c <= 57)) {
					index = i;
					System.out.println(c);
					stack.push(c);
				}
			}
			String sssss = str.substring(0, index);
			System.out.println(sssss);
			int int1 = Integer.parseInt(str.substring(0, index));
			int int2 = Integer.parseInt(str.substring(index + 1, str.length()));
			char c = (char) stack.pop().toString().charAt(0);
			switch (c) {
				case '/':
					if (compare(Dvalue, (float) int1 / int2)) {
						Dvalue = (float) int1 / int2;
						x = j;
					}
					break;
				case '*':
					if (compare(Dvalue, (float) int1 * int2)) {
						Dvalue = (float) int1 * int2;
						x = j;
					}
					break;
				case '+':
					if (compare(Dvalue, (float) int1 + int2)) {
						Dvalue = (float) int1 + int2;
						x = j;
					}
					break;
				case '-':

					if (compare(Dvalue, (float) int1 - int2)) {
						Dvalue = (float) int1 - int2;
						x = j;
					}
					break;
			}
			System.out.println("Dvalue:" + Dvalue + "  x:  " + x);
		}
		// System.out.println(Dvalue);
		return x;

	}

	public String toString() {
		return "ss";
	}

	public static void main(String args[]) {
		Test test = new Test();
		String[] str = test.stringToint(test.getString());
		for (String s : str)
			System.out.println(s);
		int index = test.parser(str);
		System.out.println(index);
	}
}