Jdk原始碼詳解之Iterable 介面

1. 介面釋義

Implementing this interface allows an object to be the target of the "foreach" statement.

2. 原始碼

package java.lang;

import java.util.Iterator;
import java.util.Objects;
import java.util.Spliterator;
import java.util.Spliterators;
import java.util.function.
 
Consumer;

public interface Iterable<T> {
  
    Iterator<T> iterator();

    default void forEach(Consumer<? super T> action) {
        Objects.requireNonNull(action);
        for (T t : this) {
            action.accept(t);
        }
    }
 
    default Spliterator<T> spliterator
 
() {
        return Spliterators.spliteratorUnknownSize(iterator(), 0);
    }
}

3. 方法簡介

• iterator()方法

    Iterator<T> iterator();

返回型別為T的元素的迭代器。【這裡的T是泛型】