- CopyOnWriteArrayList的listIterator()方法以适当的顺序返回此列表中元素的listIterator。 listIterator不支持remove,set或add方法。
用法:
public ListIterator listIterator()
参数:该函数不接受任何参数。
返回值:该函数返回此列表中元素的列表迭代器(按正确顺序)
以下示例程序旨在说明上述函数:
示例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 listIterator() method of Iterator iteratorVals = ArrLis.listIterator(); // 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
- CopyOnWriteArrayList的listIterator(index)方法从特定索引开始,以适当的顺序在此列表中的元素上返回一个listIterator。 listIterator不支持remove,set或add方法。
用法:
public ListIterator listIterator(int index)
参数:该函数接受参数索引,该索引指定要从列表迭代器返回的第一个元素的索引。
返回值:该函数从指定的索引(以正确的顺序)开始,在此列表中的元素上返回列表迭代器。
异常:如果索引超出范围,该函数将抛出IndexOutOfBoundsException。
以下示例程序旨在说明上述函数:
示例1:
// Java Program to illustrate the CopyOnWriteArrayList // listIterator() 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 listIterator() method from 2nd index Iterator iteratorVals = ArrLis.listIterator(2); // 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: jgec sudo
程序2:
// Java Program to illustrate the CopyOnWriteArrayList // listIterator() method in Java, exception 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 listIterator() method from 6th index // hence exception is returned Iterator iteratorVals = ArrLis.listIterator(6); // 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:
Exception in thread "main" java.lang.IndexOutOfBoundsException: Index: 6 at java.util.concurrent.CopyOnWriteArrayList.listIterator(CopyOnWriteArrayList.java:1107) at GFG.main(GFG.java:25)
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