Java CopyOnWriteArraySet containsAll()用法及代码示例

Java CopyOnWriteArraySet的containsAll()方法用于检查两个集合是否包含相同的元素。它使用一个集合作为参数，如果该集合的所有元素都存在于另一个集合中，则返回True。

用法:

public boolean containsAll(Collection C)

参数：参数C是一个Collection。此参数表示需要在此集合中检查其元素出现的集合。

返回值：如果此集合包含其他集合的所有元素，则该方法返回True，否则返回False。

以下示例程序旨在说明CopyOnWriteArraySet.containsAll()方法：

示例1:

// Java code to illustrate 
// CopyOnWriteArraySet containsAll() 
  
import java.util.*; 
import java.util.concurrent.*; 
  
class StackDemo { 
    public static void main(String args[]) 
    { 
  
        // Creating an empty set 
        CopyOnWriteArraySet<String> 
            set = new CopyOnWriteArraySet<String>(); 
  
        // Use add() method to 
        // add elements in the set 
        set.add("Geeks"); 
        set.add("for"); 
        set.add("Geeks"); 
        set.add("10"); 
        set.add("20"); 
  
        // prints the set 
        System.out.println("CopyOnWriteArraySet 1: "
                           + set); 
  
        // Creating another empty set 
        CopyOnWriteArraySet<String> 
            set2 = new CopyOnWriteArraySet<String>(); 
  
        // Use add() method to 
        // add elements in the set 
        set2.add("Geeks"); 
        set2.add("for"); 
        set2.add("Geeks"); 
        set2.add("10"); 
        set2.add("20"); 
  
        // prints the set 
        System.out.println("CopyOnWriteArraySet 2: "
                           + set2); 
  
        // Check if the set 
        // contains same elements 
        System.out.println("\nDoes set 1 contains set 2: "
                           + set.containsAll(set2)); 
    } 
}

输出：

CopyOnWriteArraySet 1: [Geeks, for, 10, 20]
CopyOnWriteArraySet 2: [Geeks, for, 10, 20]

Does set 1 contains set 2: true

输出：

CopyOnWriteArraySet 1: [Geeks, for, Geeks, 10, 20]
CopyOnWriteArraySet 2: [Geeks, for, Geeks, 10, 20]

Does set 1 contains set 2: true

示例2:

// Java code to illustrate boolean containsAll() 
  
import java.util.*; 
import java.util.concurrent.*; 
  
class StackDemo { 
    public static void main(String args[]) 
    { 
  
        // Creating an empty set 
        CopyOnWriteArraySet<String> 
            set = new CopyOnWriteArraySet<String>(); 
  
        // Use add() method to 
        // add elements in the set 
        set.add("Geeks"); 
        set.add("for"); 
        set.add("Geeks"); 
  
        // prints the set 
        System.out.println("CopyOnWriteArraySet 1: "
                           + set); 
  
        // Creating another empty set 
        CopyOnWriteArraySet<String> 
            set2 = new CopyOnWriteArraySet<String>(); 
  
        // Use add() method to 
        // add elements in the set 
        set2.add("10"); 
        set2.add("20"); 
  
        // prints the set 
        System.out.println("CopyOnWriteArraySet 2: "
                           + set2); 
  
        // Check if the set 
        // contains same elements 
        System.out.println("\nDoes set 1 contains set 2: "
                           + set.containsAll(set2)); 
    } 
}

输出：

CopyOnWriteArraySet 1: [Geeks, for]
CopyOnWriteArraySet 2: [10, 20]

Does set 1 contains set 2: false

相关用法

注：本文由纯净天空筛选整理自akshajjuneja9大神的英文原创作品 CopyOnWriteArraySet containsAll() method in Java with Example。非经特殊声明，原始代码版权归原作者所有，本译文未经允许或授权，请勿转载或复制。