Iterable

Iterable接口来自java.lang包，实现了Iterable接口的类可以使用for each去遍历。

Iterable接口通过iterator()方法返回一个Iterator实例

package java.lang;

/**
 * Implementing this interface allows an object to be the target of
 * the "for-each loop" statement.
 */
public interface Iterable<T> {
    /**
     * Returns an iterator over elements of type
     *
     * @return an Iterator.
     */
    Iterator<T> iterator();

    /**
     * @param action The action to be performed for each element
     * @throws NullPointerException if the specified action is null
     * @since 1.8
     */
    default void forEach(Consumer<? super T> action) {
        Objects.requireNonNull(action);
        for (T t : this) {
            action.accept(t);
        }
    }

}

Java--Iterable和Iterator

原文：https://www.cnblogs.com/swifthao/p/12863355.html