String split方法

       

String split方法 当在末尾含有空字符时尤其应注意

        String a = ",,";
        System.out.println(a.split(",").length);//0
        System.out.println(a.split(",",-1).length);//3
        a = ",,1";
        System.out.println(a.split(",").length);//3
        System.out.println(a.split(",",-1).length);//3
        a = "1,,";
        System.out.println(a.split(",").length);//1
        System.out.println(a.split(",",-1).length);//3