Java LinkedBlockingDeque contains()用法及代碼示例

LinkedBlockingDeque的contains(Object o)方法檢查容器中是否存在參數中傳遞的元素。如果該元素存在於容器中，則返回true，否則返回false值。

用法:

public boolean contains(Object o)

參數：此方法接受一個強製性參數o，該參數要檢查容器中是否存在容器。

返回值：如果該元素存在，則此方法返回true，否則返回false。

以下示例程序旨在說明LinkedBlockingDeque的contains()方法：

示例1:

// Java Program Demonstrate contains() 
// method of LinkedBlockingDeque 
  
import java.util.concurrent.LinkedBlockingDeque; 
import java.util.*; 
  
public class GFG { 
    public static void main(String[] args) 
        throws IllegalStateException 
    { 
  
        // create object of LinkedBlockingDeque 
        LinkedBlockingDeque<Integer> LBD 
            = new LinkedBlockingDeque<Integer>(); 
  
        // Add numbers to end of LinkedBlockingDeque 
        LBD.add(10); 
        LBD.add(20); 
        LBD.add(30); 
        LBD.add(40); 
  
        // before removing print queue 
        System.out.println("Linked Blocking Deque: " + LBD); 
  
        // check for presence using function 
        if (LBD.contains(10)) { 
            System.out.println("Linked Blocking Deque contains 10"); 
        } 
        else { 
            System.out.println("Linked Blocking Deque does not contain 10"); 
        } 
    } 
}

輸出：

Linked Blocking Deque: [10, 20, 30, 40]
Linked Blocking Deque contains 10

示例2:

// Java Program Demonstrate contains() 
// method of LinkedBlockingDeque 
import java.util.concurrent.LinkedBlockingDeque; 
import java.util.*; 
  
public class GFG { 
    public static void main(String[] args) 
        throws IllegalStateException 
    { 
  
        // create object of LinkedBlockingDeque 
        LinkedBlockingDeque<String> LBD 
            = new LinkedBlockingDeque<String>(); 
  
        // Add numbers to end of LinkedBlockingDeque 
        LBD.add("ab"); 
        LBD.add("cd"); 
        LBD.add("fg"); 
        LBD.add("xz"); 
  
        // before removing print queue 
        System.out.println("Linked Blocking Deque: " + LBD); 
  
        // check for presence using function 
        if (LBD.contains("go")) { 
            System.out.println("Linked Blocking Deque contains 'go'"); 
        } 
        else { 
            System.out.println("Linked Blocking Deque does not contain 'go'"); 
        } 
    } 
}

輸出：

Linked Blocking Deque: [ab, cd, fg, xz]
Linked Blocking Deque does not contain 'go'

參考： https://docs.oracle.com/javase/7/docs/api/java/util/concurrent/LinkedBlockingDeque.html#contains(java.lang.Object)

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注：本文由純淨天空篩選整理自gopaldave大神的英文原創作品 LinkedBlockingDeque contains() method in Java。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。