Question

我是Java的新手，我的代码需要一些帮助。

import java.util.Arrays;
import java.util.Scanner;
import java.util.Random;
public class asdf {
    public static void main(String[] args)
    {
        Random generator = new Random();
        int num1;
        String theWord;
        Scanner in = new Scanner(System.in);
        System.out.println("Enter a string to rearrange");
        theWord = in.nextLine();
        int length = theWord.length();
        Random times=new Random();
        System.out.println("Length of String:"+length);
        char[] chars=theWord.toCharArray();
        Arrays.sort(chars);
        int timez=times.nextInt();
        num1=generator.nextInt(length);
        char c=theWord.charAt(num1);
        String newWord=new String(chars);
        for(int i=0;i+=1;i<timez)
        {
            newWord=newWord.replace(c, '*');
        }
        System.out.println(newWord);
     }
}

所以我试图重新排列字符串并用＆＃39; *＆＃39;替换一些字符，但它没有用，我也不知道如何解决它。< / p>

Answer 1

import java.util.Arrays;
import java.util.Scanner;
import java.util.Random;
public class asdf {
public static void main(String[] args) {
    Random generator = new Random();
    int num1;
    String theWord;
    Scanner in = new Scanner(System.in);
    System.out.println("Enter a string to rearrange");
    theWord = in.nextLine();
    int length = theWord.length();
    Random times=new Random();
    System.out.println("Length of String:"+length);
    char[] chars=theWord.toCharArray();
    Arrays.sort(chars);
    int timez=times.nextInt();
    num1=generator.nextInt(length);
    char c=theWord.charAt(num1);
    String newWord=new String(chars);
    for(int i=0;i<timez;i++) {
        newWord=newWord.replace(c, '*');
    }
    System.out.println(newWord);
    }
 }

Ideone示例：http://ideone.com/PjfAor

Answer 2

问题在于import glob filenames = glob.glob(os.path.join(dirname,'*.jpg'))循环。您应该按如下方式更改循环：

for

如果您感兴趣，这是实现您想要实现的目标的另一种更清洁的方式：

for (int i = 0; i < timez; i++)

<强>输入：

public static void main(String[] args) {
    Scanner in = new Scanner(System.in);
    char[] input = in.nextLine().toCharArray();

    Random rand = new Random();
    for (int k = 0; k < 5; k++) {
        int leftIndex = rand.nextInt(input.length - 1);
        int rightIndex = rand.nextInt(input.length - 1);

        if (leftIndex == rightIndex)
            continue;

        char buffer = input[leftIndex];
        input[leftIndex] = input[rightIndex];
        input[rightIndex] = buffer;
    }

    System.out.println(input);
    in.close();
}

<强>输出：

mango

随机替换字符串中随机数的char

2 个答案: