java替换和replaceAll.全部替换不起作用 [英] java replace e replaceAll. ReplaceAll not working

问题描述

我有这个练习.为什么不使用 replaceAll?我有一个错误:字符串索引超出范围:1

I have this exercise. Why not work with replaceAll? I have an error: String index out of range: 1

 public class e3 {

    public static void main(String[] args) {
        String x="Sessione successiva";
        String nuova=x.replace("i", "!");
        String nuova2=nuova.replace("s", "$");
        String nuova3=nuova2.replace("e", "&");
        System.out.println(nuova3);

            //replaceAll
        String nuovaz=x.replaceAll("i", "!");
        String nuova2z=nuovaz.replaceAll("s", "$");
        String nuova3z=nuova2.replaceAll("e", "&");
        System.out.println(nuova3z);


    }

}

推荐答案

replaceAll 适用于正则表达式.在 replacAll 方法中，$ 是一个保留字符，用于引用作为第一个参数给出的正则表达式中定义的组，因此您需要对其进行转义.

replaceAll works with regular expressions. In the replacAll method, $ is a reserved character used to reference groups defined in the regular expression given as first parameter, so you need to escape it.

String nuova2z=nuovaz.replaceAll("s", "\\$");

演示

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