Java 實例 - 刪除集合中指定元素

Java 實例 Java 實例

以下實例演示了如何使用 Collection 類的 collection.remove() 方法來刪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( "集合實例!\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("集合數(shù)據(jù): ");  
      iterator = collection.iterator();     
      while (iterator.hasNext()){
         System.out.print(iterator.next() + " ");  
      }
      System.out.println();
      collection.remove(str2);
      System.out.println("刪除之后 [" + str2 + "]\n");
      System.out.print("現(xiàn)在集合的數(shù)據(jù)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");
   }
}

以上代碼運行輸出結(jié)果為：

集合實例!

集合數(shù)據(jù): White Yellow Blue Green 
刪除之后 [White]

現(xiàn)在集合的數(shù)據(jù)是: Yellow Blue Green 
集合大小: 3

Java 實例 Java 實例