# Heap sort is the loading of interview classes for Java senior engineers

mb61ab40ce80d9c 2022-01-15 03:09:42 阅读数:831

• @author JourWon

• @date 2019/7/11 23:40

*/

public static void heapSort(int[] array) {

if (array == null || array.length <= 1) {

return;

}

int length = array.length;

//1. Build the big top heap

for (int i = length / 2 - 1; i >= 0; i--) {

// From the first non leaf node, from bottom to top , Adjust the structure from right to left

}

//2. Adjust heap structure + Swapping top and end elements

for (int j = length - 1; j > 0; j--) {

// Exchange the top element with the end element

swap(array, 0, j);

}

}

/**

• Description: Adjustment of the GTR （ It's just the adjustment process , Based on the built-up of the GTR ）

• @param array

• @param i

• @param length

• @return void

• @author JourWon

• @date 2019/7/11 17:58

*/

private static void adjustHeap(int[] array, int i, int length) {

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// Take out the current element first i

int temp = array[i];

// from i The left child of the node begins , That is to say 2i+1 Start at

for (int k = i 2 + 1; k < length; k = k 2 + 1) {

// If the left child node is less than the right child node ,k Point to the right child node

if (k + 1 < length && array[k] < array[k + 1]) {

k++;

}

// If the child node is larger than the parent node , Assign the child node value to the parent node （ There's no exchange ）

if (array[k] > temp) {

array[i] = array[k];

i = k;

} else {

break;

}

}

// take temp Put the value in the final position

array[i] = temp;

}

/**

• Description: Exchange element positions

• @param array

• @param a

• @param b

• @return void

• @author JourWon

• @date 2019/7/11 17:57

*/

private static void swap(int[] array, int a, int b) {

int temp = array[a];

array[a] = array[b];

array[b] = temp;

}

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