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AbstractSet抽象类源码解析

来源:互联网 作者:佚名 时间:2016-07-17 21:15
继承AbstractCollection 实现Set 源码如下 package java.util; public abstract class AbstractSet E extends AbstractCollection E implements Set E { protected AbstractSet() { } public boolean equals(Object o) { if (o == this ) return true ; if (

继承AbstractCollection
实现Set
源码如下



package java.util;



public abstract class AbstractSet<E> extends AbstractCollection<E> implements Set<E> {

    protected AbstractSet() {
    }


    public boolean equals(Object o) {
        if (o == this)
            return true;

        if (!(o instanceof Set))
            return false;
        Collection c = (Collection) o;
        if (c.size() != size())
            return false;
        try {
            return containsAll(c);
        } catch (ClassCastException unused)   {
            return false;
        } catch (NullPointerException unused) {
            return false;
        }
    }

    public int hashCode() {
        int h = 0;
        Iterator<E> i = iterator();
        while (i.hasNext()) {
            E obj = i.next();
            if (obj != null)
                h += obj.hashCode();
        }
        return h;
    }

    public boolean removeAll(Collection<?> c) {
        boolean modified = false;

        if (size() > c.size()) {
            for (Iterator<?> i = c.iterator(); i.hasNext(); )
                modified |= remove(i.next());
        } else {
            for (Iterator<?> i = iterator(); i.hasNext(); ) {
                if (c.contains(i.next())) {
                    i.remove();
                    modified = true;
                }
            }
        }
        return modified;
    }

}
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