Java 中的 CopyOnWriteArrayList 迭代器()方法
原文:https://www . geeksforgeeks . org/copy onwriterarraylist-iterator-method-in-Java/
的迭代器()方法以适当的顺序返回该列表中元素的迭代器。迭代器不支持移除方法。
语法:
public Iterator iterator()
参数: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:
程序 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
程序二:
// 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
版权属于：月萌API www.moonapi.com，转载请注明出处
