containsall

向量類containsAll()方法 (Vector Class containsAll() method)

• containsAll() method is available in java.util package.

  containsAll()方法在java.util包中可用。

• containsAll() method is used to test the existence of all the elements of this Vector in the given Collection (co).

  containsAll()方法用于測試給定Collection(co)中此Vector的所有元素的存在。

• containsAll() method is a non-static method, it is accessible with the class object only and if we try to access the method with the class name then we will get an error.

  containsAll()方法是一個非靜態方法，只能通過類對象訪問，如果嘗試使用類名稱訪問該方法，則會收到錯誤消息。

• containsAll() method may throw an exception at the time of checking the existence of the collection.

  在檢查集合是否存在時， containsAll()方法可能會引發異常。

  NullPointerException: This exception may throw when the given parameter is null exists.

  NullPointerException ：當給定參數為null時，可能引發此異常。

Syntax:

句法：

public boolean containsAll(Collection co);

Parameter(s):

參數：

• Collection co – represents the Collection object whose element will be checked for the existence in this Vector.

  Collection co –表示Collection對象，將檢查其元素是否存在于此Vector中。

Return value:

返回值：

The return type of the method is boolean, it returns true when this Vector hold all of the given Collection elements otherwise it returns false.

方法的返回類型為boolean ，當此Vector包含所有給定的Collection元素時，它返回true ，否則返回false 。

Example:

例：

// Java program to demonstrate the example // of boolean containsAll(Collection co) method // of Vector import java.util.*;public class ContainsAllOfVector {public static void main(String[] args) {// Instantiates a Vector object with// initial capacity of "10"Vector < String > v = new Vector < String > (10);ArrayList arr_l = new ArrayList();// By using add() method is to add the// elements in this vv.add("C");v.add("C++");v.add("JAVA");// By using add() method is to add the// elements in this arr_larr_l.add("C");arr_l.add("C++");arr_l.add("SFDC");// Display Vector and ArrayListSystem.out.println("v: " + v);System.out.println("arr_l: " + arr_l);// By using containsAll(arr_l) method is to// check whether this vector contains all of the// elements in the given collection arr_l or notboolean status = v.containsAll(arr_l);// Display statusSystem.out.println("v.containsAll(arr_l): " + status);} }

Output

輸出量

v: [C, C++, JAVA] arr_l: [C, C++, SFDC] v.containsAll(arr_l): false

翻譯自: https://www.includehelp.com/java/vector-containsall-method-with-example.aspx

containsall

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