Question

在我的作业中，我需要得到这个输出：

输入一个词：house
你想要取代什么信？：e
你希望用什么信取代它？ w ^
新词是housw。

_____________________________________________。

我得到了使用此代码的程序，但现在我需要设置while循环。这是我目前的代码。

String word =＆＃34;＆＃34 ;; 扫描仪键盘=新扫描仪（System.in）;

    System.out.print("Enter a word: " + word);
    word = keyboard.nextLine();

    String readChar = null;
    System.out.print("What letter do you want to replace?: ");
    readChar = keyboard.next();

    String changeChar;
    System.out.print("With what letter do you wish to replace it? ");
    changeChar = keyboard.next();

    keyboard.close();
    System.out.println(word.replaceAll(readChar, changeChar));

    System.out.println();

我现在需要让我的程序输出：

输入一个词：house
你要用什么字母取代？：a 没有内部。
你想替换什么信？：b
没有内部。
你想要取代什么信？：e
你希望用什么信取代它？ w ^
新词是housw。

我的while循环如何描绘此输出？

Answer 1

在您阅读了要替换的单词和字符（以及要替换它的字符）之后，您可以使用String类中的replace方法。

以下是一个示例用法（使变量名称适应您的代码）

word = word.replace(letterToReplace, replacementLetter);

所以例如

String word = "aba";
word = word.replace('a', 'c');
System.out.println(word); // Prints out 'cbc'

此处还有replace方法的JavaDoc强制链接：

http://docs.oracle.com/javase/7/docs/api/java/lang/String.html#replace%28char,%20char%29

Answer 2

我希望你不介意硬解释，下面是你可以遵循的例子。

 String a = "HelloBrother How are you!";
 String r = a.replace("HelloBrother","Brother");

 print.i(r);

Answer 3

如果要替换所有字母，可以这样做（工作代码）：

public static void main(String[] args) {

    String word = "";
    Scanner keyboard = new Scanner(System.in);

    System.out.print("Enter a word: " + word);
    word = keyboard.nextLine();

    String readChar = null;
    System.out.print("What letter do you want to replace?: ");
    readChar = keyboard.next();

    String changeChar;
    System.out.print("With what letter do you wish to replace it? ");
    changeChar = keyboard.next();

    keyboard.close();
    System.out.println(word.replace(readChar, changeChar));
}

Answer 4

好的，这是实现编辑的第二部分问题的一种可能方式：

public static void main(String[] args) {

    String word = "";
    Scanner keyboard = new Scanner(System.in);

    System.out.print("Enter a word: " + word);
    word = keyboard.nextLine();

    boolean done = false;
    do{
        String readChar = null;
        System.out.print("What letter do you want to replace?: ");
        readChar = keyboard.next();

        if(word.contains(readChar)){

            String changeChar;
            System.out.print("With what letter do you wish to replace it? ");
            changeChar = keyboard.next();

            done = true;
            keyboard.close();
            System.out.println(word.replace(readChar, changeChar));
        }
    }
    while(!done);
}

Answer 5

这说明了你需要做什么。

import java.util.Scanner;
public class WordScrambler{

    public static void main(String[] args) {

    Scanner keyboard = new Scanner(System.in);

    System.out.print("Enter a word: ");
    String word = keyboard.nextLine();

    System.out.print("What letter do you want to replace?: ");
    char letter = keyboard.next().charAt(0);

    StringBuffer out = new StringBuffer(word);
    System.out.print("With what letter do you wish to replace it? ");
    char changeChar = keyboard.next().charAt(0);

    for (int i=0; i<word.length(); ++i) 
        if(word.charAt(i) == changeChar)
            out.setCharAt(i, changeChar);

    System.out.println("The new word is "+out);
    }
}

替换字符串中的char值（Java）

5 个答案: