util.Iterator; public class CollectionExample { public static void main(String[] args) { // 创建一个 ArrayList ArrayList<String> fruits = new ArrayList<>(); // 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 ...
importjava.util.HashSet;importjava.util.Set;publicclassSetExample{publicstaticvoidmain(String[]args){Set<String>set=newHashSet<>();set.add("Apple");set.add("Apple");set.add("Banana");set.add("Cherry");System.out.println(set);// prints [Apple, Banana, Cherry] (order may vary)}} 运...
import java.util.Collection; public class CollectionExample { public static void main(String[] args) { Collection collection = new ArrayList<>(); collection.add("Java"); collection.add("Python"); collection.add("C++"); collection.remove("Python"); System.out.println("Collection size: " + ...
import java.util.Iterator; public class CollectionExample { public static void main(String[] args) { // 创建一个 ArrayList ArrayList<String> fruits = new ArrayList<>(); // 添加元素 fruits.add("苹果"); fruits.add("香蕉"); fruits.add("橙子"); // 删除元素 fruits.remove("香蕉"); // ...
6. New Methods Added inCollectionsClass The Collections class is a utility class that contains methods for common operations on collection types. One such operation is converting a mutable collection to an immutable one. For example,Collections.unmodifiableList()method returns an unmodifiable view of ...
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: AI检测代码解析 importjava.util.LinkedList;importjava.util.Queue;publicclassQueueExample{publicstaticvoidmain(String[]args){Queue<...
* date: 2021/4/8.*/publicclassArrayListLambdaExample {publicstaticvoidmain(String[] args) { Collection persons=newArrayList(); System.out.println(persons.size());//判断集合元素核数persons.add("帅哥"); persons.add("美女"); persons.add("大爷");//添加元素//查找需要传入的匿名类对象persons.fo...
(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 ...
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Java Generics Example Generics was added in Java 5 to providecompile-time type checkingand removing risk ofClassCastExceptionthat was common while working with collection classes. The whole collection framework was re-written to use generics for type-safety. Let’s see how generics help us using ...