Java中，数组中的元素转移 [英] Java, Shifting Elements in an Array

问题描述

我在Java对象的数组，我想一个元素拉至顶部，一个休息下移。

I have an array of objects in Java, and I am trying to pull one element to the top and shift the rest down by one.

假设我有大小为10的数组，而我试图拉第五元素。第五元素进入位置 0 从0到5的所有元素将依次下移。

Assume I have an array of size 10, and I am trying to pull the fifth element. The fifth element goes into position 0 and all elements from 0 to 5 will be shifted down by one.

这个算法不正确转移的元素：

This algorithm does not properly shift the elements:

Object temp = pool[position];

for (int i = 0; i < position; i++) {                
    array[i+1] = array[i];
}
array[0] = temp;

我怎么做是正确的？

How do I do it correctly?

推荐答案

假设你的数组是{} 10,20,30,40,50,60,70,80,90,100

Assuming your array is {10,20,30,40,50,60,70,80,90,100}

你的循环的作用是：

迭代1：阵列[1] =阵列[0]; {} 10,10,30,40,50,60,70,80,90,100

Iteration 1: array[1] = array[0]; {10,10,30,40,50,60,70,80,90,100}

迭代2：数组[2] =阵列[1]; {} 10,10,10,40,50,60,70,80,90,100

Iteration 2: array[2] = array[1]; {10,10,10,40,50,60,70,80,90,100}

你应该做的是

Object temp = pool[position];

for (int i = (position - 1); i >= 0; i--) {                
    array[i+1] = array[i];
}

array[0] = temp;

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