用示例链接 Java 中的 List 元素()方法
原文:https://www . geeksforgeeks . org/linked list-element-method-in-Java-with-examples/
Java . util . linkedlist类的元素()方法检索但不移除该列表的头部(第一个元素)。
语法:
public E element()
返回值:该方法返回该列表的头。
以下是说明元素()方法的示例
例 1:
// Java program to demonstrate
// element() method
// for Integer value
import java.util.*;
public class GFG1 {
public static void main(String[] argv) throws Exception
{
try {
// creating object of LinkedList<Integer>
LinkedList<Integer> list = new LinkedList<Integer>();
// add some elements to list
list.add(10);
list.add(20);
list.add(30);
// print the linked list
System.out.println("LinkedList : " + list);
// getting the head of list
// using element() method
int value = list.element();
// print the head of list
System.out.println("Head of list : " + value);
}
catch (NullPointerException e) {
System.out.println("Exception thrown : " + e);
}
}
}
Output:
LinkedList : [10, 20, 30]
Head of list : 10
例 2:
// Java program to demonstrate
// element() method
// for String value
import java.util.*;
public class GFG1 {
public static void main(String[] argv) throws Exception
{
try {
// creating object of LinkedList<String>
LinkedList<String> list = new LinkedList<String>();
// add some elements to list
list.add("A");
list.add("B");
list.add("C");
// print the linked list
System.out.println("LinkedList : " + list);
// getting the head of list
// using element() method
String value = list.element();
// print the head of list
System.out.println("Head of list : " + value);
}
catch (NullPointerException e) {
System.out.println("Exception thrown : " + e);
}
}
}
Output:
LinkedList : [A, B, C]
Head of list : A
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