在Java中你可以将其设置为空数组中删除元素？ [英] In java to remove an element in an array can you set it to null?

问题描述

我试图使该对数组实现列表的工作的删除方法。
我可以设置重复的元素设置为null删除它？假设该名单正在有序进行。

  ArrayList的一个=新的ArrayList [];公共无效removeduplicates（）{    用于：（a [i]于.equals（一个第[i + 1]）{        一个第[i + 1] =无效;    }
    一个第[i + 1] = A [];
}
 

解决方案

不，你不能从一个数组中删除元素，如使之短。 Java数组是固定大小。您需要使用 的ArrayList 了点。

如果您设置为null元素，阵列将仍然有相同的大小，但在这一点空引用。

  //假设A = [0,1,2,3,4]（整数[]）
 一个[2] = NULL;
 //现在A = [0,1，空，3,4]
 

I am trying to make a remove method that works on an array implementation of a list. Can I set the the duplicate element to null to remove it? Assuming that the list is in order.

ArrayList a = new ArrayList[];

public void removeduplicates(){

    for(a[i].equals(a[i+1]){

        a[i+1] = null;

    }
    a[i+1] = a[i];
}

解决方案

No you can't remove an element from an array, as in making it shorter. Java arrays are fixed-size. You need to use an ArrayList for that.

If you set an element to null, the array will still have the same size, but with a null reference at that point.

 // Let's say a = [0,1,2,3,4] (Integer[])
 a[2] = null;
 // Now a = [0,1,null,3,4]

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