import java.util.ArrayList; import java.util.Collection; public class CollectionExample { publi...
importjava.util.ArrayList;importjava.util.Iterator;publicclassCollectionExample{publicstaticvoidmain(String[]args){// 创建一个 ArrayListArrayList<String>fruits=newArrayList<>();// 添加元素fruits.add("苹果");fruits.add("香蕉");fruits.add("橙子");// 删除元素fruits.remove("香蕉");// 遍历元素for(...
Queue接口的用法 Queue接口继承自Collection接口,它是一种用于存储和操作队列的集合。Queue接口提供了一些方法用于添加、删除和获取队列中的元素,如add、remove和peek等。下面是一个使用Queue的示例代码: importjava.util.LinkedList;importjava.util.Queue;publicclassQueueExample{publicstaticvoidmain(String[]args){Queue<...
importjava.lang.reflect.Constructor;importjava.util.ArrayList;importjava.util.Collection;importjava.util.function.Consumer;/*** @ClassName ArrayListExample * @projectName: object1 *@author: Zhangmingda * @description: XXX * date: 2021/4/8.*/publicclassArrayListExample {publicstaticvoidmain(String[]...
importjava.util.ArrayList;importjava.util.Collection;publicclassCollectionExample{publicstaticvoidmain(String[]args){Collection<String>fruits=newArrayList<>();fruits.add("apple");fruits.add("banana");fruits.add("orange");System.out.println(fruits.contains("banana"));// 输出 trueSystem.out.println(...
51、类 ExampleA 继承 Exception,类 ExampleB 继承ExampleA。 52、List、Set、Map 是否继承自 Collection 接口? List、Set 是 ,Map 不是。Map 是键值对映射容器,与 List 和 Set 有明显的区别,而 Set 存储的零散的元素且不允许有重复元素(数学中的集合也是如此),List是线性结构的容器,适用于按数值索引访问元素...
System.out.println(dupBooks.toString());//remove duoplicates using a SetCollection<Book> noDups =newHashSet<>(dupBooks); System.out.println("After removing dupliates"); System.out.println(noDups.toString());//example of using Set to eliminate dups and sort automaticallySet<Integer> numbers...
(For example, the algorithm used by sort does not have to be a mergesort, but it does have to be stable.) The "destructive" algorithms contained in this class, that is, the algorithms that modify the collection on which they operate, are specified to throw UnsupportedOperationException if ...
public class IteratorExample { public static void main(String[] args){ //创建集合，添加元素 Collection days = new ArrayList();for(int i =0;i<10;i++){ Day day = new Day(i,i*60,i*3600);days.add(day);} //获取days集合的迭代器 Iterator iterator = days.iterator();while(iterator....
Iterator接口经常被称作迭代器,它是Collection接口的父接口。但Iterator主要用于遍历集合中的元素。 Iterator接口中主要定义了2个方法: 下面程序简单示范了通过Iterator对象逐个获取元素的逻辑。 public class IteratorExample { public static void main(String[] args){ ...