Java字符串未转换为小写 [英] Java string not converted to lower case

问题描述

为什么字符串 s 转换为小写字母后会打印"Hello，World" ?

Why does the string s print "Hello, World" after converting to lower case?

public class Practice {
    public static void main(String[] args){
        String s = "Hello, World";
        s.toLowerCase();
        System.out.println(s);
    }
}

推荐答案

String 是不可变的.您需要将 String#toLowerCase 的结果重新分配给变量:

Strings are immutable. You need to re assign the result of String#toLowerCase to the variable:

s = s.toLowerCase();

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