在我检查负载因子是否指示要调整大小的后备阵列之后,我实际上如何通过二次探测来调整大小?
这是代码。这只是课堂的一部分。另外,你能检查一下我是否正确地实现了 add 方法吗?
import java.util.*;
public class HashMap<K, V> implements HashMapInterface<K, V> {
// Do not make any new instance variables.
private MapEntry<K, V>[] table;
private int size;
/**
* Create a hash map with no entries.
*/
public HashMap() {
table = new MapEntry[STARTING_SIZE];
size = 0;
}
@Override
public V add(K key, V value) {
if (key == null || value == null) {
throw new IllegalArgumentException("Passed in null arguments.");
}
if (getNextLoadFactor() > MAX_LOAD_FACTOR) {
resize();
}
MapEntry<K, V> entry = new MapEntry<>(key, value);
V val = null;
int index = Math.abs(key.hashCode()) % table.length;
int temp = index;
int q = 1;
do {
if (table[index] == null) {
table[index] = entry;
} else if (table[index].getKey().equals(key)) {
val = table[index].getValue();
table[index].setValue(value);
}
index = index + q*q % table.length;
q++;
} while (temp != index);
size++;
return val;
}
private double getNextLoadFactor() {
return (double) size / (double) table.length;
}
private void resize() {
MapEntry<K, V>[] temp = table;
table = new MapEntry[table.length * 2 + 1];
for (int i = 0; i < table.length; i++) {
}
}