Java中的ConcurrentLinkedQueue contains()方法

这个 包含() 方法 ConcurrentLinkedQueue 如果ConcurrentLinkedQueue包含作为参数传递的对象o,则返回true。当且仅当此ConcurrentLinkedQueue包含至少一个元素e,该元素e等于作为参数传递的对象o,即o.equals(e),则此方法返回true。

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语法:

public boolean contains(Object o)

参数: 此方法只接受一个参数 O 表示检查ConcurrentLinkedQueue是否包含指定对象的对象。

返回: 此方法返回 符合事实的 如果此ConcurrentLinkedQueue包含该对象。

下面的程序演示了ConcurrentLinkedQueue的contains()方法:

例1:

// Java Program Demonstrate contains()
// method of ConcurrentLinkedQueue
import java.util.concurrent.*;
public class GFG {
public static void main(String[] args)
{
// create an ConcurrentLinkedQueue
ConcurrentLinkedQueue<String>
queue = new ConcurrentLinkedQueue<String>();
// Add String to queue
queue.add( "Aman" );
queue.add( "Amar" );
queue.add( "Sanjeet" );
queue.add( "Rabi" );
// Displaying the existing ConcurrentLinkedQueue
System.out.println( "ConcurrentLinkedQueue: " + queue);
// check whether queue contains String "Aman"
boolean response1 = queue.contains( "Aman" );
// print after applying contains method
System.out.println( "queue contains String "Aman" : "
+ response1);
// check whether queue contains "Ram"
boolean response2 = queue.contains( "Ram" );
// print after applying contains method
System.out.println( "queue contains String "Ram" : "
+ response2);
}
}


输出:

ConcurrentLinkedQueue: [Aman, Amar, Sanjeet, Rabi]
queue contains String "Aman" : true
queue contains String "Ram" : false

例2:

// Java Program Demonstrate contains()
// method of ConcurrentLinkedQueue
import java.util.concurrent.*;
public class GFG {
public static void main(String[] args)
{
// create an ConcurrentLinkedQueue
ConcurrentLinkedQueue<Integer>
queue = new ConcurrentLinkedQueue<Integer>();
// Add Numbers to queue
queue.add( 4353 );
queue.add( 7824 );
queue.add( 78249 );
queue.add( 8724 );
// Displaying the existing ConcurrentLinkedQueue
System.out.println( "ConcurrentLinkedQueue: " + queue);
// check whether queue contains 78249
boolean response1 = queue.contains( 78249 );
// print after applying contains method
System.out.println( "queue contains Number 78249 : "
+ response1);
// check whether queue contains 9876
boolean response2 = queue.contains( 9876 );
// print after applying contains method
System.out.println( "queue contains Number 9876: "
+ response2);
}
}


输出:

ConcurrentLinkedQueue: [4353, 7824, 78249, 8724]
queue contains Number 78249 : true
queue contains Number 9876: false

参考: https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/ConcurrentLinkedQueue.html#contains-爪哇。lang.反对-

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