Java ConcurrentLinkedDeque contains()用法及代碼示例

java.util.concurrent.ConcurrentLinkedDeque.contains()方法是Java中的內置方法，用於檢查雙端隊列中是否存在作為參數傳遞的指定元素。

用法:

public boolean contains(Object elem)

參數：該方法接受參數elem，該參數檢查指定的元素是否存在於雙端隊列中。

返回值：如果雙端隊列中存在元素，則函數返回True，否則返回False。

以下示例程序旨在說明ConcurrentLinkedDeque.contains()方法：

程序1：

// Java Program to Demonstrate contains() 
// method of ConcurrentLinkedDeque 
  
import java.util.concurrent.*; 
  
class GFG { 
    public static void main(String[] args) 
    { 
  
        // Creating an empty Deque 
        ConcurrentLinkedDeque<String> cld = new ConcurrentLinkedDeque<String>(); 
  
        // Add elements into the Deque 
        cld.add("Welcome"); 
        cld.add("To"); 
        cld.add("Geeks"); 
        cld.add("4"); 
        cld.add("Geeks"); 
  
        // Displaying the Deque 
        System.out.println("ConcurrentLinkedDeque: "
                           + cld); 
  
        // Check if GFG is present using contains() 
        if (cld.contains("GFG")) { 
  
            // Displaying message 
            System.out.println("GFG is present"); 
        } 
        else { 
  
            // Displaying message 
            System.out.println("GFG is not present"); 
        } 
    } 
}

輸出：

ConcurrentLinkedDeque: [Welcome, To, Geeks, 4, Geeks]
GFG is not present

示例2:

// Java Program to Demonstrate contains() 
// method of ConcurrentLinkedDeque 
  
import java.util.concurrent.*; 
  
class GFG { 
    public static void main(String[] args) 
    { 
  
        // Creating an empty Deque 
        ConcurrentLinkedDeque<String> cld = new ConcurrentLinkedDeque<String>(); 
  
        // Add elements into the Deque 
        cld.add("Welcome"); 
        cld.add("To"); 
        cld.add("Geeks"); 
        cld.add("4"); 
        cld.add("Geeks"); 
  
        // Displaying the Deque 
        System.out.println("ConcurrentLinkedDeque: "
                           + cld); 
  
        // Check if Geeks is present using contains() 
        if (cld.contains("Geeks")) { 
  
            // Displaying message 
            System.out.println("Geeks is present"); 
        } 
        else { 
  
            // Displaying message 
            System.out.println("Geeks not present"); 
        } 
    } 
}

輸出：

ConcurrentLinkedDeque: [Welcome, To, Geeks, 4, Geeks]
Geeks is present

參考： https://docs.oracle.com/javase/9/docs/api/java/util/concurrent/ConcurrentLinkedDeque.html#contains-java.lang.Object-

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注：本文由純淨天空篩選整理自Aishwarya Jayashankar大神的英文原創作品 ConcurrentLinkedDeque contains() method in Java with Examples。非經特殊聲明，原始代碼版權歸原作者所有，本譯文未經允許或授權，請勿轉載或複製。