Java 实例 - 删除集合中指定元素
以下实例演示了如何使用 Collection 类的 collection.remove() 方法来删除集合中的指定的元素:
/* author by w3cschool.cc Main.java */ import java.util.*; public class Main { public static void main(String [] args) { System.out.println( "集合实例!\n" ); int size; HashSet collection = new HashSet (); String str1 = "Yellow", str2 = "White", str3 = "Green", str4 = "Blue"; Iterator iterator; collection.add(str1); collection.add(str2); collection.add(str3); collection.add(str4); System.out.print("集合数据: "); iterator = collection.iterator(); while (iterator.hasNext()){ System.out.print(iterator.next() + " "); } System.out.println(); collection.remove(str2); System.out.println("删除之后 [" + str2 + "]\n"); System.out.print("现在集合的数据是: "); iterator = collection.iterator(); while (iterator.hasNext()){ System.out.print(iterator.next() + " "); } System.out.println(); size = collection.size(); System.out.println("集合大小: " + size + "\n"); } }
以上代码运行输出结果为:
集合实例! 集合数据: White Yellow Blue Green 删除之后 [White] 现在集合的数据是: Yellow Blue Green 集合大小: 3