String 类的replace方法替换字符串“无效”、“不起作用”原因
为了去掉"abcdefg"中间的c
public class Main {
public static void main(String[] args) {
String s = "abcdefg";
s.replace("c","");
System.out.println(s);
}
}
//输出结果abcdefg
问题所在就是s= s.replace("","");需要一个变量在接受他的返回值
public class Main {
public static void main(String[] args) {
String s = "abcdefg";
s = s.replace("c","");
System.out.println(s);
}
}
//输出结果abdefg