Java中的 AbstractSequentialList conatinsAll() 方法与示例

Java AbstractSequentialList的containsAll()方法用于检查两个 Collection 是否包含相同的元素。它将一个集合作为参数，如果该集合的所有元素都存在于另一个集合中，则返回 True。

句法：

public boolean containsAll(Collection C)

参数：参数C是一个集合。该参数是指需要在该集合中检查其元素出现的集合。

返回值：如果此集合包含其他集合的所有元素，则该方法返回 True，否则返回 False。

下面的程序说明了 AbstractSequentialList.conatinsAll() 方法：

方案一：

// Java code to illustrate
// AbstractSequentialList containsAll()
  
import java.util.*;
  
class AbstractSequentialListDemo {
    public static void main(String args[])
    {
  
        // Creating an empty Collection
        AbstractSequentialList
            abs = new LinkedList();
  
        // Use add() method to
        // add elements in the collection
        abs.add("Geeks");
        abs.add("for");
        abs.add("Geeks");
        abs.add("10");
        abs.add("20");
  
        // prints the list
        System.out.println("AbstractSequentialList 1: "
                           + abs);
  
        // Creating another empty Collection
        AbstractSequentialList
            abs2 = new LinkedList();
  
        // Use add() method to
        // add elements in the collection
        abs2.add("Geeks");
        abs2.add("for");
        abs2.add("Geeks");
        abs2.add("10");
        abs2.add("20");
  
        // prints the list
        System.out.println("AbstractSequentialList 2: "
                           + abs2);
  
        // Check if the collection
        // contains same elements
        System.out.println("\nBoth the collections same: "
                           + abs.containsAll(abs2));
    }
}

输出：

AbstractSequentialList 1: [Geeks, for, Geeks, 10, 20]
AbstractSequentialList 2: [Geeks, for, Geeks, 10, 20]

Both the collections same: true

方案二：

// Java code to illustrate boolean containsAll()
  
import java.util.*;
  
class AbstractSequentialListDemo {
    public static void main(String args[])
    {
  
        // Creating an empty Collection
        AbstractSequentialList
            abs = new LinkedList();
  
        // Use add() method to
        // add elements in the collection
        abs.add("Geeks");
        abs.add("for");
        abs.add("Geeks");
  
        // prints the list
        System.out.println("AbstractSequentialList 1: "
                           + abs);
  
        // Creating another empty Collection
        AbstractSequentialList
            abs2 = new LinkedList();
  
        // Use add() method to
        // add elements in the collection
        abs2.add("10");
        abs2.add("20");
  
        // prints the list
        System.out.println("AbstractSequentialList 2: "
                           + abs2);
  
        // Check if the collection
        // contains same elements
        System.out.println("\nAre both collections same: "
                           + abs.containsAll(abs2));
    }
}

输出：

AbstractSequentialList 1: [Geeks, for, Geeks]
AbstractSequentialList 2: [10, 20]

Are both collections same: false