Question

对所有编码员都很高兴，任何帮助都表示赞赏，因为这是一个个人项目，而不是我认为会很有趣的学校，但事实并非如此。现在该项目是读入一个输入文件，将其与srting [] alphabets = {“a”，“b”，“c”......“z”}进行比较，然后用另一个字符串替换字母[ ] newAlphabets = {“Apple”，“Ball”，“Cat”，......“Zebra”}。现在我尝试了简单的replaceAll（）示例，它有点工作。但计划是输入.txt文件并使用新文件进行替换运行和输出。 JamesBond.txt ：姓名是邦德，詹姆斯邦德。 Output.txt 应为：NoAppleMonkeyElephant InsectSnake BallOpenNoDuck，JungelAppleMonkeyElephantSnake BallOpenNoDuck。 这是我到目前为止所拥有的：

import java.io.IOException;
import java.io.File;
import java.util.Scanner;

public class FnR {
// array of alphabets 
static String[] alphabet = {"a","b","c","d","e","f","g","h","i",
        "j","k","l","m","n","o","p","q","r","s","t","u",
        "v","w","x","y","z"};
 // replace the alphabets with substituted string
 static String[] newAlphabets = 
{"Apple","Bat","Cat","Dog","Egale","Fox","Goat","Horse","Insect","Jungle",
"King","Lion","Monkey","Nose","Open","Push","Quit","Run","Stop","Turn",
 "Up","Volume","Water","X-mas","Yes","Zip"};
@SuppressWarnings("resource")
 public static void main(String[] arg) throws IOException{
    try {
        //reads in the file 
        Scanner input = new Scanner("JamesBond.txt");
        File file = new File(input.nextLine());
        input = new Scanner(file);

        while (input.hasNextLine()) {
            String line = input.nextLine();
            //prints the txt file out
            System.out.println(line);
            // replaces the letter j with Jungel in the text regardless of 
        case
            String newtxt1 = line.replaceAll("J","Jungle");

            //prints new text 
            System.out.println(newtxt1);
        }
        input.close();
    } catch (Exception ex) {
        ex.printStackTrace();
    }
}   }
Output:
Name is Bond, James Bond
Name is Bond, Jungleames Bond

Answer 1

不会给你代码。这个答案为您提供了自己编写代码的提示。

不要使用replaceAll()。你必须做26次，这不是一个好的解决方案。

而是创建一个StringBuilder来构建结果字符串。然后使用String方法length()和charAt()以正常for循环遍历输入字符串的字符。

现在这里是主要的＆＃34;技巧＆＃34;这将简化您的代码。 Java以Unicode格式存储文本，其中连续存储字母a到z。这意味着您可以计算索引到newAlphabets数组中。为此，您将编写如下代码：

char ch = ...;
if (ch >= 'a' && ch <= 'z') {
    int idx = ch - 'a';  // number between 0 and 25, inclusive
    // use idx here
} else if (ch >= 'A' && ch <= 'Z') {
    int idx = ch - 'A';  // number between 0 and 25, inclusive
    // use idx here
} else {
    // not a letter
}

希望这可以帮助您自己编写代码。

用java中字符串数组中的字符串替换字符

1 个答案: