Java CopyOnWriteArraySet size()用法及代码示例

CopyOnWriteArraySet的size()方法返回Set的大小。它返回当前Set中的元素数。

用法:

public int size()

返回值：该函数返回当前Set中的元素数。

以下示例程序旨在说明上述函数：

示例1:

// Java Program to illustrate the CopyOnWriteArraySet 
// size() method in Java 
  
import java.util.concurrent.CopyOnWriteArraySet; 
import java.util.*; 
  
public class GFG { 
    public static void main(String[] args) 
    { 
  
        // create object of CopyOnWriteArraySet 
        CopyOnWriteArraySet<Integer> ArrSet 
            = new CopyOnWriteArraySet<Integer>(); 
  
        // print CopyOnWriteArraySet 
        System.out.println("CopyOnWriteArraySet: "
                           + ArrSet); 
  
        // size value print 
        System.out.println("size of ArrSet: "
                           + ArrSet.size()); 
  
        // Add elements 
        ArrSet.add(32); 
        ArrSet.add(67); 
        ArrSet.add(98); 
        ArrSet.add(100); 
  
        // print CopyOnWriteArraySet 
        System.out.println("CopyOnWriteArraySet: "
                           + ArrSet); 
  
        // size value print 
        System.out.println("size of ArrSet: "
                           + ArrSet.size()); 
    } 
}

输出：

CopyOnWriteArraySet: []
size of ArrSet: 0
CopyOnWriteArraySet: [32, 67, 98, 100]
size of ArrSet: 4

示例2:

// Java Program to illustrate the CopyOnWriteArraySet 
// size() method in Java 
  
import java.util.concurrent.CopyOnWriteArraySet; 
import java.util.*; 
  
public class GFG { 
    public static void main(String[] args) 
    { 
  
        // create object of CopyOnWriteArraySet 
        CopyOnWriteArraySet<String> ArrSet 
            = new CopyOnWriteArraySet<String>(); 
  
        // Add elements 
        ArrSet.add("gopal"); 
        ArrSet.add("gfg"); 
        ArrSet.add("jgec"); 
        ArrSet.add("sudo"); 
  
        // print CopyOnWriteArraySet 
        System.out.println("CopyOnWriteArraySet: "
                           + ArrSet); 
  
        // size value print 
        System.out.println("size of ArrSet: "
                           + ArrSet.size()); 
    } 
}

输出：

CopyOnWriteArraySet: [gopal, gfg, jgec, sudo]
size of ArrSet: 4

参考： https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/CopyOnWriteArraySet.html#size–

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