用某种方法在java中的字符串中选择一个随机字符

selecting a random char in a string in java with a certain method(用某种方法在java中的字符串中选择一个随机字符)

问题描述

我必须使用此方法从字符串中选择并返回 1 个随机字符(与 main 方法分开):

I have to select and return 1 random character out of a string using this method (separate from main method):

public static char selectAChar(String s)

public static char selectAChar(String s)

我不确定如何选择随机变量，也不确定是否应该使用 for 循环.我尝试过的所有方法都无法返回正确的变量类型.

I'm not sure how to select the random variable, and not sure if i should use a for loop. everything I've tried I couldn't get it to return the right variable type.

这是我到目前为止的编码

heres the coding i have so far

public static void main(String args[])
{
    Scanner kbd = new Scanner (System.in);

    System.out.println("Enter a string: ");
    String s = kbd.next();

    selectAChar(s);
}



public  static  char selectAChar(String s)
{


}

我用这个 for 循环尝试了一些东西for(int i = 0; i

i tried something using this for loop for(int i = 0; i < s.length(); i++) but i can't figure out how to choose a random character and return it.

推荐答案

public static char selectAChar(String s){

    Random random = new Random();
    int index = random.nextInt(s.length());
    return s.charAt(index);

}

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