copy onwriterarrayset 包含 Java 中的 All()方法，示例
原文:https://www . geeksforgeeks . org/copy onwriterarrayset-contains all-in-Java-method-with-example/
Java copy onwriterarrayset的 containsAll() 方法用于检查两个集合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。
语法:
public boolean containsAll(Collection C)
参数:参数 C 为集合。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:如果这个集合包含其他集合的所有元素，方法返回真，否则返回假。
下面的程序说明了 copy onwriterarrayset . contains all()方法:
程序 1:
// Java code to illustrate
// CopyOnWriteArraySet containsAll()
import java.util.*;
import java.util.concurrent.*;
class StackDemo {
public static void main(String args[])
{
// Creating an empty set
CopyOnWriteArraySet<String>
set = new CopyOnWriteArraySet<String>();
// Use add() method to
// add elements in the set
set.add("Geeks");
set.add("for");
set.add("Geeks");
set.add("10");
set.add("20");
// prints the set
System.out.println("CopyOnWriteArraySet 1: "
+ set);
// Creating another empty set
CopyOnWriteArraySet<String>
set2 = new CopyOnWriteArraySet<String>();
// Use add() method to
// add elements in the set
set2.add("Geeks");
set2.add("for");
set2.add("Geeks");
set2.add("10");
set2.add("20");
// prints the set
System.out.println("CopyOnWriteArraySet 2: "
+ set2);
// Check if the set
// contains same elements
System.out.println("\nDoes set 1 contains set 2: "
+ set.containsAll(set2));
}
}
Output:
CopyOnWriteArraySet 1: [Geeks, for, 10, 20]
CopyOnWriteArraySet 2: [Geeks, for, 10, 20]
Does set 1 contains set 2: true
Output:
CopyOnWriteArraySet 1: [Geeks, for, Geeks, 10, 20]
CopyOnWriteArraySet 2: [Geeks, for, Geeks, 10, 20]
Does set 1 contains set 2: true
程序 2:
// Java code to illustrate boolean containsAll()
import java.util.*;
import java.util.concurrent.*;
class StackDemo {
public static void main(String args[])
{
// Creating an empty set
CopyOnWriteArraySet<String>
set = new CopyOnWriteArraySet<String>();
// Use add() method to
// add elements in the set
set.add("Geeks");
set.add("for");
set.add("Geeks");
// prints the set
System.out.println("CopyOnWriteArraySet 1: "
+ set);
// Creating another empty set
CopyOnWriteArraySet<String>
set2 = new CopyOnWriteArraySet<String>();
// Use add() method to
// add elements in the set
set2.add("10");
set2.add("20");
// prints the set
System.out.println("CopyOnWriteArraySet 2: "
+ set2);
// Check if the set
// contains same elements
System.out.println("\nDoes set 1 contains set 2: "
+ set.containsAll(set2));
}
}
Output:
CopyOnWriteArraySet 1: [Geeks, for]
CopyOnWriteArraySet 2: [10, 20]
Does set 1 contains set 2: false
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