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我正在尝试在 Java 中创建代码，用户在其中创建（输入）一个短语，然后选择（输入）一个字符。从那里我假设接受用户输入并将他们选择的字符替换为他们创建的短语中的 X。我不完全确定如何创建它，我知道我想使用 Scanner 然后我不知道我是否必须创建一个新字符串或使用突变方法。运行时应该是这样的：

  • 输入短语：披萨很好
  • 输入字符：z
  • Pixxa 不错

我对Java相当陌生，这是我迄今为止尝试过的

这是我的代码：

import java.util.Scanner;
public class ModifyStrings 
{ 
public static void main (String[] args)
{
String enterPhrase;
    String enterCharacter;

    //Scanner
    Scanner scan2 = new Scanner (System.in);

    //Print out that the user will see and type in
    System.out.println("Enter a phrase or sentence: ");
            enterPhrase = scan.nextLine();

    //Second print out that the user will enter in for a character to change
    System.out.println("Enter Character: ");
    enterCharacter = scan.nextLine();

    //mutation
            ?

    //Character changes that letter into x
    System.out.println("New phrase: "+ enterPhrase);
  }
}

谢谢！

4

1 回答 1

2

这可以通过使用 String 方法 replaceAll() 来完成。试试下面的代码，这对你有用。

import java.util.Scanner;

public class ModifyStrings { 

    public static void main (String[] args) {   

        String enterPhrase;
        String enterCharacter;

        //Scanner
        Scanner scan = new Scanner (System.in);

        //Print out that the user will see and type in
        System.out.println("Enter a phrase or sentence: ");
                enterPhrase = scan.nextLine();

        //Second print out that the user will enter in for a character to change
        System.out.println("Enter Character: ");

        // This line of code firstly get the string truncate white spaces and then get the first character not all
        enterCharacter =  scan.nextLine().trim().substring(0, 1);

        //Mutation code replace x with your desired character do you want to replaces
        enterPhrase =  enterPhrase.replaceAll(enterCharacter, "x");


        //Character changes that letter into x
        System.out.println("New phrase: "+ enterPhrase);
 }
}
于 2014-09-11T05:30:49.530 回答