LinkedHashMap构造函数

public LinkedHashMap() {
        super();
        accessOrder = false;
    }

public LinkedHashMap(int initialCapacity) {
        super(initialCapacity);
        accessOrder = false;
    }

public LinkedHashMap(int initialCapacity, float loadFactor) {
        super(initialCapacity, loadFactor);
        accessOrder = false;
    }

public LinkedHashMap(Map<? extends K, ? extends V> m) {
        super();
        accessOrder = false;
        putMapEntries(m, false);
    }

 public LinkedHashMap(int initialCapacity,
                         float loadFactor,
                         boolean accessOrder) {
        super(initialCapacity, loadFactor);
        this.accessOrder = accessOrder;
    }

注意，构造函数如果不明确传入accessOrder的话，默认都是按插入序的。