JDK1.8源码阅读HashMap

public HashMap(int initialCapacity, float loadFactor) {}  // 初始容量，和加载因子

public HashMap(int initialCapacity) {} //　初始容量

public HashMap() {} // 空参构造

public HashMap(Mapextends K, ? extends V> m) {} // 将Map对象进行构造

public int size() {} // 长度
 
public boolean isEmpty() {} // 是否为空

public V get(Object key) {} // 根据key获取值

public boolean containsKey(Object key) {} // 判断是否含某key

public V put(K key, V value) {} // 添加Key Value

public void putAll(Mapextends K, ? extends V> m) {}  // 添加多个

public V remove(Object key) {} // 删除

public void clear() {} // 清空

public boolean containsValue(Object value) {} // 判断是否有value

public Set keySet() {} // 将key转换成Set

public Collection values() {} // 将values转换成collection对象

// Overrides of JDK8 Map extension methods

@Override
public V getOrDefault(Object key, V defaultValue) {} //　根据key获取，若不存在则设置该值
   

@Override
public V putIfAbsent(K key, V value) {} // 若key对于的值为空则设置该值，并返回

@Override
public boolean remove(Object key, Object value) {} //删除key value

@Override
public boolean replace(K key, V oldValue, V newValue) {} // 指定值替换 

@Override
public V replace(K key, V value) {} // 直接替换

@Override
public V computeIfAbsent(K key,Functionsuper K, ? extends V> mappingFunction) {}

public V computeIfPresent(K key,BiFunctionsuper K, ? super V, ? extends V> remappingFunction) {}

@Override
public V compute(K key,BiFunctionsuper K, ? super V, ? extends V> remappingFunction) {}

@Override
public V merge(K key, V value,hash, key, value, first);
      
@Override
public void forEach(BiConsumersuper K, ? super V> action) {} // 提供迭代

@Override
public void replaceAll(BiFunctionsuper K, ? super V, ? extends V> function) {}

@SuppressWarnings("unchecked")
@Override
public Object clone() {} // 复制

private void writeObject(java.io.ObjectOutputStream s)}

private void readObject(java.io.ObjectInputStream s){}