这个 迭代器（） 方法 CopyOnWriteArrayList 按正确的顺序返回此列表中元素的迭代器。迭代器不支持remove方法。
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语法：
public Iterator iterator()
参数： 该函数不接受任何参数。
返回值： 函数返回列表中元素的迭代器。
以下程序说明了上述功能：
项目1：
// Java Program to illustrate the CopyOnWriteArrayList // iterator() method in Java import java.util.concurrent.CopyOnWriteArrayList; import java.util.*; public class GFG { public static void main(String[] args) { // create object of CopyOnWriteArrayList CopyOnWriteArrayList<Integer> ArrLis = new CopyOnWriteArrayList<Integer>(); // Add elements ArrLis.add( 32 ); ArrLis.add( 67 ); ArrLis.add( 67 ); ArrLis.add( 100 ); // print CopyOnWriteArrayList System.out.println( "CopyOnWriteArrayList: " + ArrLis); // Call iterator() method of Iterator iteratorVals = ArrLis.iterator(); // Print elements of iterator // created from CopyOnWriteArrayList System.out.println( "The iterator values" + " of CopyOnWriteArrayList are:" ); // prints the elements using an iterator while (iteratorVals.hasNext()) { System.out.println(iteratorVals.next()); } } } |
输出：
CopyOnWriteArrayList: [32, 67, 67, 100] The iterator values of CopyOnWriteArrayList are: 32 67 67 100
项目2：
// Java Program to illustrate the CopyOnWriteArrayList // iterator() method in Java import java.util.concurrent.CopyOnWriteArrayList; import java.util.*; public class GFG { public static void main(String[] args) { // create object of CopyOnWriteArrayList CopyOnWriteArrayList<String> ArrLis = new CopyOnWriteArrayList<String>(); // Add elements ArrLis.add( "gopal" ); ArrLis.add( "gfg" ); ArrLis.add( "jgec" ); ArrLis.add( "sudo" ); // print CopyOnWriteArrayList System.out.println( "CopyOnWriteArrayList: " + ArrLis); // Call iterator() method of Iterator iteratorVals = ArrLis.iterator(); // Print elements of iterator // created from CopyOnWriteArrayList System.out.println( "The iterator values" + " of CopyOnWriteArrayList are:" ); // prints the elements using an iterator while (iteratorVals.hasNext()) { System.out.println(iteratorVals.next()); } } } |
输出：
CopyOnWriteArrayList: [gopal, gfg, jgec, sudo] The iterator values of CopyOnWriteArrayList are: gopal gfg jgec sudo
参考： https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/CopyOnWriteArrayList.html#iterator–
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