Java 中的抽象列表迭代器()方法,示例
原文:https://www . geesforgeks . org/abstract list-iterator-method-in-Java-with-examples/
Java . util . abstract list类的迭代器()方法用于以适当的顺序返回该列表中元素的迭代器。
这个实现返回迭代器接口的简单实现,依赖于支持列表的 size(),get(int)和 remove(int)方法。
语法:
public Iterator iterator()
返回值:这个方法返回一个迭代器,以适当的顺序遍历列表中的元素。
下面是说明迭代器()方法的例子。
例 1:
// Java program to demonstrate
// iterator() method
// for Integer value
import java.util.*;
public class GFG1 {
public static void main(String[] argv)
throws Exception
{
try {
// Creating object of AbstractList<Integer>
AbstractList<Integer>
arrlist1 = new ArrayList<Integer>();
// Populating arrlist1
arrlist1.add(10);
arrlist1.add(20);
arrlist1.add(30);
arrlist1.add(40);
arrlist1.add(50);
// print arrlist1
System.out.println("ArrayList : "
+ arrlist1);
// creating object of Iterator
// using iterator() method
Iterator it = arrlist1.iterator();
// printing the iterated value
while (it.hasNext()) {
System.out.println("Value is : "
+ it.next());
}
}
catch (NullPointerException e) {
System.out.println("Exception thrown : " + e);
}
}
}
Output:
ArrayList : [10, 20, 30, 40, 50]
Value is : 10
Value is : 20
Value is : 30
Value is : 40
Value is : 50
例 2:
// Java program to demonstrate
// iterator() method
// for String value
import java.util.*;
public class GFG1 {
public static void main(String[] argv)
throws Exception
{
try {
// Creating object of AbstractList<String>
AbstractList<String>
arrlist1 = new ArrayList<String>();
// Populating arrlist1
arrlist1.add("A");
arrlist1.add("B");
arrlist1.add("C");
arrlist1.add("D");
arrlist1.add("E");
// print arrlist1
System.out.println("ArrayList : "
+ arrlist1);
// creating object of Iterator
// using iterator() method
Iterator it = arrlist1.iterator();
// printing the iterated value
while (it.hasNext()) {
System.out.println("Value is : "
+ it.next());
}
}
catch (NullPointerException e) {
System.out.println("Exception thrown : " + e);
}
}
}
Output:
ArrayList : [A, B, C, D, E]
Value is : A
Value is : B
Value is : C
Value is : D
Value is : E
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