Java中的 CopyOnWriteArraySet iterator() 方法

CopyOnWriteArraySet的iterator()方法以正确的顺序返回此 Set 中元素的迭代器。迭代器不支持 remove 方法。

句法：

public Iterator iterator()

返回值：该函数返回 Set 中元素的迭代器。

下面的程序说明了上述函数：

方案一：

// Java Program to illustrate the CopyOnWriteArraySet
// iterator() 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 ArrSet
            = new CopyOnWriteArraySet();
  
        // Add elements
        ArrSet.add(32);
        ArrSet.add(67);
        ArrSet.add(67);
        ArrSet.add(100);
  
        // print CopyOnWriteArraySet
        System.out.println("CopyOnWriteArraySet: "
                           + ArrSet);
  
        // Call iterator() method of
        Iterator iteratorVals = ArrSet.iterator();
  
        // Print elements of iterator
        // created from CopyOnWriteArraySet
        System.out.println("\nThe iterator values of "
                           + "CopyOnWriteArraySet are:\n");
  
        // prints the elements using an iterator
        while (iteratorVals.hasNext()) {
            System.out.println(iteratorVals.next());
        }
    }
}

输出：

CopyOnWriteArraySet: [32, 67, 100]

The iterator values of CopyOnWriteArraySet are:

32
67
100

方案二：

// Java Program to illustrate the CopyOnWriteArraySet
// iterator() 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 ArrSet
            = new CopyOnWriteArraySet();
  
        // Add elements
        ArrSet.add("gopal");
        ArrSet.add("gfg");
        ArrSet.add("jgec");
        ArrSet.add("sudo");
  
        // print CopyOnWriteArraySet
        System.out.println("CopyOnWriteArraySet: "
                           + ArrSet);
  
        // Call iterator() method of
        Iterator iteratorVals = ArrSet.iterator();
  
        // Print elements of iterator
        // created from CopyOnWriteArraySet
        System.out.println("\nThe iterator values of "
                           + "CopyOnWriteArraySet are:\n");
  
        // prints the elements using an iterator
        while (iteratorVals.hasNext()) {
            System.out.println(iteratorVals.next());
        }
    }
}

输出：

CopyOnWriteArraySet: [gopal, gfg, jgec, sudo]

The iterator values of CopyOnWriteArraySet are:

gopal
gfg
jgec
sudo

参考： https: Java/util/concurrent/CopyOnWriteArraySet.html#iterator–