Java 中的数组列表迭代器()方法，示例
原文:https://www . geesforgeks . org/ArrayList-iterator-method-in-Java-with-examples/
Java 集合框架中数组列表类的迭代器()方法用于以适当的顺序获取该列表中元素的迭代器。返回的迭代器是快速失败的。
语法:
Iterator iterator()
参数:此方法不接受任何参数。
返回值:这个方法返回一个迭代器在这个列表中的元素上以适当的顺序
下面的例子说明了 ArrayList.iterator()方法:
程序 1:
// Java code to illustrate iterator()
import java.util.*;
public class GFG {
public static void main(String[] args)
{
// Create and populate the list
ArrayList<String> list
= new ArrayList<>();
list.add("Geeks");
list.add("for");
list.add("Geeks");
list.add("is");
list.add("a");
list.add("CS");
list.add("Students");
list.add("Portal");
// Displaying the list
System.out.println("The list is: \n"
+ list);
// Create an iterator for the list
// using iterator() method
Iterator<String> iter
= list.iterator();
// Displaying the values after iterating
// through the list
System.out.println("\nThe iterator values"
+ " of list are: ");
while (iter.hasNext()) {
System.out.print(iter.next() + " ");
}
}
}
Output:
The list is:
[Geeks, for, Geeks, is, a, CS, Students, Portal]
The iterator values of list are:
Geeks for Geeks is a CS Students Portal
程序 2:
// Java code to illustrate iterator()
import java.util.*;
public class GFG {
public static void main(String args[])
{
// Creating an empty ArrayList
ArrayList<Integer> list
= new ArrayList<Integer>();
// Use add() method to add
// elements into the list
list.add(10);
list.add(15);
list.add(30);
list.add(20);
list.add(5);
// Displaying the list
System.out.println("The list is: \n"
+ list);
// Create an iterator for the list
// using iterator() method
Iterator<Integer> iter = list.iterator();
// Displaying the values
// after iterating through the list
System.out.println("\nThe iterator values"
+ " of list are: ");
while (iter.hasNext()) {
System.out.print(iter.next() + " ");
}
}
}
Output:
The list is:
[10, 15, 30, 20, 5]
The iterator values of list are:
10 15 30 20 5
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