value1 = map.get("key1"); System.out.println("Value for 'key1': " + value1); // 输出: Value for 'key1': value1 // 尝试获取一个不存在的key String value2 = map.get("key3"); if (value2 == null) { System.out.println("'key3' does not exist in the map. Returning null...
publicV get(Object key) {//调用genEntry得到EntryEntry<K,V> e = (Entry<K,V>)getEntry(key);if(e ==null)returnnull;//如果LinkedHashMap是访问顺序的,则get时,也需要重新排序e.recordAccess(this);returne.value; } 先是调用了getEntry方法,通过key得到Entry,而LinkedHashMap并没有重写getEntry方法,...
} while (t != null); } Entry<K,V> e = new Entry<>(key, value, parent); if (cmp < 0) parent.left = e; else parent.right = e; fixAfterInsertion(e); size++; modCount++; return null; } 10. jdk7 ConcurrentHashMap的get,size,put方法 public V get(Object key) { Segment<K,V...
Search and transformation functions provided as arguments should similarly return null to indicate the lack of any result (in which case it is not used). In the case of mapped reductions, this also enables transformations to serve as filters, returning null (or, in the case of primitive specia...
return null; } public V put(K key, V value) { if (table == EMPTY_TABLE) { inflateTable(threshold); } if (key == null) return putForNullKey(value); int hash = hash(key); int i = indexFor(hash, table.length); for (Entry<K,V> e = table[i]; e != null; e = e.next...
前面提到了,accessOrder为true,表示LinkedHashMap为访问顺序,当对已存在LinkedHashMap中的Entry进行get和put操作时,会把Entry移动到双向链表的表尾(其实是先删除,再插入)。 我们拿LruCache的put方法举例: public final V put(K key, V value) { if (key == null || value == null) { throw new NullPointe...
() + ", Value = " + entry.getValue()); } 打印HashMap...pairs.getKey() + " = " + pairs.getValue()); it.remove(); // avoids a ConcurrentModificationException } } 根据HashMap...(base.get(a) >= base.get(b)) { return -1; } else { return 1; } // returning 0 would ...
LinkedHashMap 的读取实现 :get(Object key) 相对于LinkedHashMap的存储而言,读取就显得比较简单了。LinkedHashMap中重写了HashMap中的get方法,源码如下: publicVget(Objectkey) {// 根据key获取对应的Entry,若没有这样的Entry,则返回nullEntry<K,V> e = (Entry<K,V>)getEntry(key);if(e ==null)// 若不...
LinkedHashMap有对get方法进行了重写,如下: 代码语言:javascript 代码运行次数:0 运行 AI代码解释 public V get(Object key) { // 调用genEntry得到Entry Entry<K,V> e = (Entry<K,V>)getEntry(key); if (e == null) return null; // 如果LinkedHashMap是访问顺序的,则get时,也需要重新排序 e.recor...
get publicVget(Objectkey) Returns the value to which the specified key is mapped, ornullif this map contains no mapping for the key. More formally, if this map contains a mapping from a keykto a valuevsuch that(key==null ? k==null : key.equals(k)), then this method returnsv; other...