java 集合addall

集合類的addAll()方法 (Collections Class addAll() method)

• addAll() Method is available in java.lang package.

  addAll()方法在java.lang包中可用。

• addAll() Method is used to put all the given elements(ele) to the given collection (co).

  addAll()方法用于將所有給定的element( ele )放入給定的集合( co )。

• addAll() Method is a static method, it is accessible with the class name and if we try to access the method with the class object then we will not get an error.

  addAll()方法是一個(gè)靜態(tài)方法，可以使用類名進(jìn)行訪問(wèn)，如果嘗試使用類對(duì)象訪問(wèn)該方法，則不會(huì)收到錯(cuò)誤。

• addAll() Method may throw an exception at the time of add the elements(ele) to the given Collection(co).

  在將elements( ele )添加到給定Collection( co )時(shí)， addAll()方法可能會(huì)引發(fā)異常。

  • UnsupportedOperationException: This exception may throw when collection unsupport add() method.UnsupportedOperationException ：集合不支持add()方法時(shí)，可能引發(fā)此異常。
  • NullPointerException: This exception may throw when elements (ele) may have at least one null & the given collection unsupport null.
  • NullPointerException ：當(dāng)元素( ele )可能至少具有一個(gè)null且給定的集合不支持null時(shí)，可能引發(fā)此異常。
  • IllegalArgumentException: This exception may throw when the given element (ele) is not valid.
  • IllegalArgumentException ：如果給定元素( ele )無(wú)效，則可能引發(fā)此異常。

Syntax:

句法：

public static boolean addAll(Collection co, Type.. ele);

Parameter(s):

參數(shù)：

• Collection co – represents the container of "Collection" type.

  集合co –表示“集合”類型的容器。

• Type.. ele – represents the elements to add into given collection co.

  Type .. ele –表示要添加到給定集合co中的元素。

Return value:

返回值：

The return type of the method is Boolean, it returns true when the given set of elements(ele) to be added into collection successfully otherwise it returns false.

該方法的返回類型為Boolean ，如果要成功將給定的元素集(ele)添加到集合中，則返回true，否則返回false。

Example:

例：

// Java Program is to demonstrate the example // of boolean addAll(Collection co, Type.. ele) of Collections classimport java.util.*;public class AddAll {public static void main(String args[]) {// Create a linked list object List link_list = new LinkedList();// By using add() method is to add the// given elements in linked listlink_list.add(10);link_list.add(20);link_list.add(30);link_list.add(40);link_list.add(50);//Display Linked ListSystem.out.println("link_list: " + link_list);// By using addAll() method is to add all the// elements in the given collection linked listboolean status = Collections.addAll(link_list, 60, 70, 80, 90);System.out.println();System.out.println("Collections.addAll(link_list, 60,70,80,90) :");// Display Linked ListSystem.out.println("link_list: " + link_list);} }

Output

輸出量

link_list: [10, 20, 30, 40, 50]Collections.addAll(link_list, 60,70,80,90) : link_list: [10, 20, 30, 40, 50, 60, 70, 80, 90]

翻譯自: https://www.includehelp.com/java/collections-addall-method-with-example.aspx

java 集合addall

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