Java 中的 linked list removefirst occurrence()方法
原文:https://www . geesforgeks . org/linked list-removefirst occurrence-method-in-Java/
Java . util . linkedlist . removefirst occurrence()用于从列表中移除指定元素的第一个匹配项。如果指定的元素没有出现，列表保持不变。
语法:
LinkedListObject.removeFirstOccurrence(Object element)
参数:该方法取一个参数元素，从列表中删除。对象类型应该与列表中的元素相同。 返回值:如果列表包含指定的元素并被删除，则该方法返回布尔值 True，否则返回 false。 以下程序说明了 removeFirstOccurrence()方法: 程序 1 :
Java 语言（一种计算机语言，尤用于创建网站）
// Java code to demonstrate removeFirstOccurrence() method
import java.util.LinkedList;
public class GfG {
// Main method
public static void main(String[] args)
{
// Creating a LinkedList object
LinkedList<String> list = new LinkedList<String>();
// Adding an element at the last
list.addLast("one");
// Adding an element at the last
list.addLast("two");
// Adding an element at the last
list.addLast("three");
// Adding an element at the last
list.addLast("one");
System.out.print("List before removing the "+
"first Occurrence of \"one\" : ");
// Printing the list
System.out.println(list);
// Removing first occurrence of one.
boolean returnValue = list.removeFirstOccurrence("one");
// Printing the returned value
System.out.println("Returned Value : " + returnValue);
System.out.print("List after removing the"+
" first Occurrence of \"one\" : ");
// Printing the list
System.out.println(list);
}
}
Output:
List before removing the first Occurrence of "one" : [one, two, three, one]
Returned Value : true
List after removing the first Occurrence of "one" : [two, three, one]
程序 2 :
Java 语言(一种计算机语言，尤用于创建网站)
// Java code to demonstrate removeFirstOccurrence method in LinkedList
import java.util.LinkedList;
public class GfG {
// Main method
public static void main(String[] args)
{
// Creating a LinkedList object
LinkedList<Integer> list = new LinkedList<Integer>();
// Adding an element at the last
list.addLast(10);
// Adding an element at the last
list.addLast(20);
// Adding an element at the last
list.addLast(30);
// Adding an element at the last
list.addLast(10);
System.out.print("List before removing the"+
" first Occurrence of \"10\" : ");
// Printing the list
System.out.println(list);
// Removing first occurrence of one.
boolean returnValue = list.removeFirstOccurrence(10);
// Printing the returned value
System.out.println("Returned Value : " + returnValue);
System.out.print("List after removing the"+
" first Occurrence of \"10\" : ");
// Printing the list
System.out.println(list);
}
}
Output:
List before removing the first Occurrence of "10" : [10, 20, 30, 10]
Returned Value : true
List after removing the first Occurrence of "10" : [20, 30, 10]
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