Java集合框架Iterable接口

Posted 2021-07-04 11biscuits

Main.java

package 集合框架.Collection接口;
/*
*           Iterable(接口)
*           Collection(接口)
* List(接口)        Queue(接口)          Set(接口)
* ArrayList(接口类)    PriorityQueue (接口类)     HashSet(接口类)
* LinkedList(接口类)
* */

import java.util.Collections;

public class Main {
    public static void main(String[]argv){
        //CollectionDemo.show();/*Collection接口*/
        //CollectionDemo.listDemo();/*List接口*/
        //CollectionDemo.queueDemo();/*Queue接口*/
        //CollectionDemo.setDemo();/*Set接口*/
        CollectionDemo.hashMapDemo();/*Map接口*/
    }
}

GenericList.java

package 集合框架.关于Iterable接口;

import java.util.Iterator;

public class GenericList<T> implements Iterable<T>{
    //public class GenericList<T extends Comparable>
//public class GenericList<T extends Comparable & Cloneable>
//public class GenericList<T extends Number> {
    private T[] items=(T[])new Object[10];
    private int count=0;
    public void add(T item){
        items[count++]=item;
    }
    public T get(int index){
        return items[index];
    }

    @Override
    public Iterator<T> iterator() {
        return new ListIterator(this);
    }

    /*实现迭代器*/
    private class ListIterator implements Iterator<T>{
        private GenericList<T>list;
        private int index;
        public ListIterator(GenericList<T> list){
            this.list=list;
        }
        @Override
        public boolean hasNext() {
            return (index<list.count);
        }

        @Override
        public T next() {
            return list.items[index++];
        }
    }
}