staticfinal inthash(Object key){int h;return(key==null)?0:(h=key.hashCode())^(h>>>16);} 其中,key.hashCode() 是Java中自带的 hashCode() 方法,返回一个 int 类型的散列值,后面 hashCode 再右移 16 位,正好是 32bit 的一半,与自己本身做异或操作(相同为 0,不
查找过程类似于getEntry()方法；如果没有找到，则会通过addEntry(int hash, K key, V value, int b...
当新建一个HashMap的时候,就会初始化一个数组。 其中Java源码如下: /** * The table, resized as necessary. Length MUST Always be a power of two. */ transientEntry[] table; staticclassEntryimplementsMap.Entry{ finalK key; V value; Entrynext; finalinthash; …… } 可以看出,Entry就是数组中的...
intsize() Returns the number of key-value mappings in this map. Collection<V>values() Returns aCollectionview of the values contained in this map. Methods inherited from class java.util.AbstractMap equals,hashCode,toString Methods inherited from class java.lang.Object ...
private static final int SIZE = 10; private Map<Integer, String> mapOf; private Map<Integer, String> hashMap; @Setup public void setup() { mapOf = Map.of( 0, "value0", 1, "value1", 2, "value2", 3, "value3", 4, "value4", ...
HashMap<Integer, String> map = Map.of(1,"one",2,"two",3,"three"); 1. 四、常规使用方法 1.引入类 import java.util.HashMap; // 引入 HashMap 类 1. 2.初始化 HashMap<Integer, String> Sites = new HashMap<Integer, String>(); ...
int newPrice = prices.compute("Shoes", (key, value) -> value - value * 10/100); System.out.println("Discounted Price of Shoes: " + newPrice);// 输出更新后的HashMap System.out.println("Updated HashMap: " + prices); }}执行以上程序输出结果为:HashMap: {Pant=150, Bag=300, Shoes=...
else if (p instanceof TreeNode) e = ((TreeNode<K,V>)p).putTreeVal(this, tab, hash, key, value); else { for (int binCount = 0; ; ++binCount) { if ((e = p.next) == null) { p.next = newNode(hash, key, value, null); ...
= null && key.equals(k))) e = p; else if (p instanceof TreeNode) e = ((TreeNode<K,V>)p).putTreeVal(this, tab, hash, key, value); else { for (int binCount = 0; ; ++binCount) { if ((e = p.next) == null) { p.next = newNode(hash, key, val...
Sample use: this override will allow the map to grow up to 100 entries and then delete the eldest entry each time a new entry is added, maintaining a steady state of 100 entries. private static final int MAX_ENTRIES = 100; protected boolean removeEldestEntry(Map.Entry eldest) { return size...