Java,移动数组中的元素 [英] Java, Shifting Elements in an Array
问题描述
我在 Java 中有一个对象数组,我试图将一个元素拉到顶部并将其余元素向下移动一个.
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.
假设我有一个大小为 10 的数组,我想拉出第五个元素.第五个元素进入 0
位置,所有从 0 到 5 的元素将向下移动一.
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.
这个算法没有正确地移动元素:
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;
我该如何正确操作?
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: array[1] = array[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: array[2] = array[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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