Java CopyOnWriteArraySet iterator()用法及代碼示例

CopyOnWriteArraySet的iterator()方法以正確的順序返回對此Set中的元素的迭代器。迭代器不支持remove方法。

用法:

public Iterator iterator()

返回值：該函數返回Set中元素的迭代器。

以下示例程序旨在說明上述函數：

示例1:

// 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<Integer> ArrSet 
            = new CopyOnWriteArraySet<Integer>(); 
  
        // 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()); 
        } 
    } 
}

輸出：

CopyOnWriteArraySet: [32, 67, 100]

The iterator values of CopyOnWriteArraySet are:

32
67
100

示例2:

// 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<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); 
  
        // 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()); 
        } 
    } 
}

輸出：

CopyOnWriteArraySet: [gopal, gfg, jgec, sudo]

The iterator values of CopyOnWriteArraySet are:

gopal
gfg
jgec
sudo

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

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