Java 中的 LinkedList addAll()方法
原文:https://www . geesforgeks . org/Java-util-linked list-addall-method-in-Java/
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java.util.LinkedList.addAll(Collection C): This method is used to append all of the elements from the collection passed as parameter to this function to the end of a list keeping in mind the order of return by the collections iterator.
语法:
java *boolean* addAll(Collection C)参数:参数 C 是数组列表的集合。它是需要在列表末尾追加元素的集合。
返回值:如果至少执行了一个追加动作，则该方法返回真。
下面的程序说明了 Java.util.LinkedList.addAll()方法:
```java // Java code to illustrate boolean addAll() import java.util.*; import java.util.LinkedList; import java.util.ArrayList;
public class LinkedListDemo { public static void main(String args[]) {
// Creating an empty LinkedList LinkedList list = new LinkedList();
// Use add() method to add elements in the list list.add("Geeks"); list.add("for"); list.add("Geeks"); list.add("10"); list.add("20");
// A collection is created Collection collect = new ArrayList(); collect.add("A"); collect.add("Computer"); collect.add("Portal"); collect.add("for"); collect.add("Geeks");
// Displaying the list System.out.println("The LinkedList is: " + list);
// Appending the collection to the list list.addAll(collect);
// Clearing the list using clear() and displaying System.out.println("The new linked list is: " + list);
} } ```
Output:
```java The LinkedList is: [Geeks, for, Geeks, 10, 20] The new linked list is: [Geeks, for, Geeks, 10, 20, A, Computer, Portal, for, Geeks]
```
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java.util.LinkedList.addAll(int index, Collection C): This method is used to append all of the elements from the collection passed as parameter to this function at a specific index or position of a list.
语法:
java boolean addAll(int index, Collection C)参数:该函数接受两个参数，如上语法所示，描述如下。
- 索引:该参数为整数数据类型，指定列表中从容器元素插入位置开始的位置。
- C :是数组列表的集合。它是需要追加元素的集合。
返回值:如果至少执行了一个追加操作，则该方法返回真。
下面的程序说明了 Java.util.LinkedList.addAll()方法:
```java // Java code to illustrate boolean addAll() import java.util.*; import java.util.LinkedList; import java.util.ArrayList;
public class LinkedListDemo { public static void main(String args[]) {
// Creating an empty LinkedList LinkedList list = new LinkedList();
// Use add() method to add elements in the list list.add("Geeks"); list.add("for"); list.add("Geeks"); list.add("10"); list.add("20");
// Creating a Collection Collection collect = new ArrayList(); collect.add("A"); collect.add("Computer"); collect.add("Portal"); collect.add("for"); collect.add("Geeks");
// Displaying the list System.out.println("The LinkedList is: " + list);
// Appending the collection to the list list.addAll(1, collect);
// Clearing the list using clear() and displaying System.out.println("The new linked list is: " + list);
} } ```
Output:
```java The LinkedList is: [Geeks, for, Geeks, 10, 20] The new linked list is: [Geeks, A, Computer, Portal, for, Geeks, for, Geeks, 10, 20]
```
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