从一个ArrayList删除偶数 [英] Remove even numbers from an ArrayList

问题描述

我要创建有​​一个ArrayList的方法;我需要从此ArrayList删除偶数。我已经写了code表示，但有一个逻辑错误，我无法确定。

I have to create a method which has an ArrayList; I need to remove even numbers from this ArrayList. I have written code for that but there is a logical error which I couldn't identify.

下面是我的code：

static void sortList(){

   List <Integer> number=new ArrayList <Integer>();

   number.add(11);
   number.add(45);
   number.add(12);
   number.add(32);
   number.add(36);

   System.out.println("Unsorted List: "+number);

   for (int i=0;i<number.size();i++){      
       int even=number.get(i)%2;       
        if (even==0){
            System.out.println("This is Even Number:"+ number.get(i));
            number.remove(i);
        }    
    }

    Collections.sort(number);
    System.out.println("Sorted List: "+number);

 }

在code的输出是：

The output of the code is:

Unsorted List: [11, 45, 12, 32, 36]
This is Even Number:12
This is Even Number:36
Sorted List: [11, 32, 45]

我想知道这是为什么32没有被捕获为偶数，因为它是一个偶数，然后我通过测试在同一位置使用不同的连号，但结果是一样的。为什么在索引（3）它的发生，任何偶数不可能是赶上。我真的不知道为什么。所以请任何一个可以帮助我，这和有没有其他来实施该解决方案更好的办法。

I am wondering that why 32 is not caught as an Even number as it is an even number, I tested then by using different even numbers at same position but the result is same. Why at index(3) its happening that any even number couldnt be catch. I am really wondering why. So please any one can help me out for this and is there any other better way to implement this solution.

感谢

推荐答案

使用的 的Iterator 。它拥有你需要一个删除（）方法。

List<Integer> numbers = new ArrayList<Integer>();

numbers.add(11);
numbers.add(45);
numbers.add(12);
numbers.add(32);
numbers.add(36);

System.out.println("Unsorted List: " + numbers);

for (Iterator<Integer> iterator = numbers.iterator(); iterator.hasNext();) {
    Integer number = iterator.next();
    if (number % 2 == 0) {
        System.out.println("This is Even Number: " + number);
        iterator.remove();
    }

}

Collections.sort(numbers);
System.out.println("Sorted List: " + numbers);

这篇关于从一个ArrayList删除偶数的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！