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【代码】Java中判断字符串是否为数字的五种方法。

示例1：String []a="0,1,2,3,4".split(",");List<String> aList=new ArrayList<>();List<String> bList=new ArrayList<>();List<String> cList=new ArrayList<>();List<String> dList=new ArrayList<>();List<String

package com.ylzinfo.devplat.test;import java.io.BufferedReader;import java.io.FileInputStream;import java.io.InputStreamReader;public class FuZhi {public static void main(String[...