字符串替换函数无法正确替换字符 - Java

发布于 2024-11-24 21:41:08 字数 653 浏览 3 评论 0 原文

我正在尝试将字符串中的特定字符“8”替换为“2”。我认为我已经正确设置了所有内容，当我在网上查找示例时，这看起来应该是这样。当我打印字符串时，它就像我输入的那样。要运行它，请使用“80802”或一些类似的输入对其进行测试。谢谢！

import java.util.Scanner;

class PhoneNumber {

    public static void main(String[] args) {

        String number = null;

        Scanner scan = new Scanner(System.in);

        // Prompt the user for a telephone number
        System.out.print("Enter your telephone number: ");

        // Input the user's name
        number = scan.nextLine();

        // Replace the relevant letters with numbers
        number.replace('8', '2');

        System.out.println("Your number is: " + number );

    }
}

原文

I am trying to replace a specific character '8' with a '2' in a string. I think I have everything set up correctly and when I look online for examples, this looks like it should. When I print the string though, it is just as I entered it. To run it, test it with "80802" or some similar input. Thanks!

import java.util.Scanner;

class PhoneNumber {

    public static void main(String[] args) {

        String number = null;

        Scanner scan = new Scanner(System.in);

        // Prompt the user for a telephone number
        System.out.print("Enter your telephone number: ");

        // Input the user's name
        number = scan.nextLine();

        // Replace the relevant letters with numbers
        number.replace('8', '2');

        System.out.println("Your number is: " + number );

    }
}

分享到QQ

分享到微博

如果你对这篇内容有疑问，欢迎到本站社区发帖提问参与讨论，获取更多帮助，或者扫码二维码加入 Web 技术交流群。

发布评论

需要登录才能够评论，你可以免费注册一个本站的账号。

dawn曙光 2024-12-01 21:41:08

一个常见的错误...您想要：

    number = number.replace('8', '2');

String.replace() 不会更改字符串，因为字符串是不可变的（它们不能更改）。相反，此类方法返回带有计算值的新字符串。

A common mistake... You want:

    number = number.replace('8', '2');

String.replace() doesn't change the String, because Strings are immutable (they can not be changed). Instead, such methods return a new String with the calculated value.

回复收藏 0 原文

九厘米的零° 2024-12-01 21:41:08

number.replace() 返回一个新字符串。它不会改变“数字”。

回复收藏 0 原文

十级心震 2024-12-01 21:41:08

number.replace('8','2');返回正确的字符串，但不修改数字。要获得您想要的功能，您必须输入
number = number.replace('8','2');

public static void main(String[] args) {

    String number = null;

    Scanner scan = new Scanner(System.in);

    // Prompt the user for a telephone number
    System.out.print("Enter your telephone number: ");

    // Input the user's name
    number = scan.nextLine();

    // Replace the relevant letters with numbers
    number = number.replace('8', '2');

    System.out.println("Your number is: " + number );

}

希望这有帮助。

number.replace('8','2'); returns the correct string it does not modify number. To get your desired functionality you must type
number = number.replace('8','2');

public static void main(String[] args) {

    String number = null;

    Scanner scan = new Scanner(System.in);

    // Prompt the user for a telephone number
    System.out.print("Enter your telephone number: ");

    // Input the user's name
    number = scan.nextLine();

    // Replace the relevant letters with numbers
    number = number.replace('8', '2');

    System.out.println("Your number is: " + number );

}

Hope this helps.

回复收藏 0 原文

~没有更多了~