Java:在shuffle中排除数组索引 [英] Java: Exclude array index in shuffle

问题描述

是否可以在 shuffle 中排除数组索引?

Is it possible to exclude array indexes in a shuffle?

我对这个问题的见解:

   Array[0,1,2,3,4,5,6,7,8]
   Exclude Array index 2 and 7 in shuffle.
   Shuffle Array.
   Array[3,5,2,1,6,8,0,7,4]

这是我在洗牌中使用的:

This is my what I used in my shuffle:

List<Pokemon>list = Arrays.asList(pkm);
Collections.shuffle(list);

谢谢@Jhanvi！我研究了你的代码，它给了我一些想法.我试着玩弄你和@Rohit Jain 的代码并创建了一个示例:

Thanks, @Jhanvi! I studied your code and it gave me some ideas. I tried to play around with yours and @Rohit Jain's codes and created a sample:

import java.util.Arrays;

    import java.util.Collections;
    import java.util.List;
    import java.util.ArrayList;

public class Example {

 public static void main(String[]args){
    String[] x = {"a","b","c","d","e","f","g","h"};
    List<String> list = new ArrayList<String>(Arrays.asList(x));
    System.out.println("Before shuffling, ArrayList contains : " + list);
    Object obj = list.remove(7);
    Object obj1 = list.remove(2);
    Collections.shuffle(list);
    list.add(2, obj1);
    list.add(7, obj);
    System.out.println("After shuffling, ArrayList contains : " + list);        
 }     
}

烦人的是它给了我一个错误:在我的 list.add() 上都找不到符号方法 add(int,java.lang.Object).

Annoyingly it gives me an error: cannot find symbol method add(int,java.lang.Object) on both my list.add().

我检查了 List 是否存在 .add(int,Object) 方法，认为它会起作用.我错过了什么部分?

I checked that there exists a .add(int,Object) method for List, thinking that it will work. What part did I miss?

推荐答案

你可以试试这样的:

ArrayList arrayList = new ArrayList();
arrayList.add(0);
arrayList.add(1);
arrayList.add(2);
arrayList.add(3);
arrayList.add(4);
arrayList.add(5);
arrayList.add(6);
arrayList.add(7);
System.out.println("Before shuffling, ArrayList contains : " + arrayList);
Object obj = arrayList.remove(7); // remove by index!
Object obj1 = arrayList.remove(2);
Collections.shuffle(arrayList);
arrayList.add(2, obj1);
arrayList.add(7, obj);
System.out.println("After shuffling, ArrayList contains : " + arrayList);

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