Java 中的 Vector addAll()方法
原文:https://www.geeksforgeeks.org/vector-addall-method-in-java/
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java.util.Vector.addAll(Collection C): This method is used to append all of the elements from the collection passed as a parameter to this function to the end of a vector keeping in mind the order of return by the collection’s iterator.
语法:
java boolean addAll(Collection C)参数:该方法接受一个强制参数 C ，它是数组列表的集合。它是一个集合，其元素需要追加到向量的末尾。
返回值:如果至少执行了一个追加动作，则该方法返回真，否则返回假。
下面的程序说明了 Java.util.Vector.addAll()方法:
```java // Java code to illustrate boolean addAll() import java.util.*; import java.util.ArrayList;
public class GFG { public static void main(String args[]) {
// Creating an empty Vector Vector vt = new Vector();
// Use add() method to add elements in the Vector vt.add("Geeks"); vt.add("for"); vt.add("Geeks"); vt.add("10"); vt.add("20");
// A collection is created Collection c = new ArrayList(); c.add("A"); c.add("Computer"); c.add("Portal"); c.add("for"); c.add("Geeks");
// Displaying the Vector System.out.println("The Vector is: " + vt);
// Appending the collection to the vector vt.addAll(c);
// Clearing the vector using clear() and displaying System.out.println("The new vector is: " + vt); } } ```
Output:
```java The Vector is: [Geeks, for, Geeks, 10, 20] The new vector is: [Geeks, for, Geeks, 10, 20, A, Computer, Portal, for, Geeks]
```
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java.util.Vector.addAll(int index, Collection C): This method is used to append all of the elements from the collection passed as a parameter to this function at a specific index or position of a vector.
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，指定向量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动作，则该方法返回真，否则返回假。
下面的程序说明了 Java.util.Vector.addAll()方法:
```java // Java code to illustrate boolean addAll() import java.util.*; import java.util.ArrayList;
public class GFG { public static void main(String args[]) { // Creating an empty Vector Vector vt = new Vector();
// Use add() method to add elements in the Vector vt.add("Geeks"); vt.add("for"); vt.add("Geeks"); vt.add("10"); vt.add("20");
// A collection is created Collection c = new ArrayList(); c.add("A"); c.add("Computer"); c.add("Portal"); c.add("for"); c.add("Geeks");
// Displaying the Vector System.out.println("The Vector is: " + vt);
// Appending the collection to the vector vt.addAll(1, c);
// Clearing the vector using clear() and displaying System.out.println("The new vector is: " + vt); } } ```
Output:
```java The Vector is: [Geeks, for, Geeks, 10, 20] The new vector is: [Geeks, A, Computer, Portal, for, Geeks, for, Geeks, 10, 20]
```
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