Java LinkedBlockingDeque isEmpty()方法及示例

Java中 LinkedBlockingDeque 的 isEmpty() 方法是用来检查这个LinkedBlockingDeque是否为空。它返回一个布尔值，说明这一点。

语法

public boolean isEmpty()

参数： 该方法不接受参数。

返回： 该方法返回一个布尔值，说明LinkedBlockingDeque的这个实例是否为空。

下面的例子说明了LinkedBlockingDeque.isEmpty()方法。

程序1 :

// Java Program Demonstrate isEmpty()
// 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(7855642);
        LBD.add(35658786);
        LBD.add(5278367);
        LBD.add(74381793);
  
        System.out.println("Linked Blocking Deque: " + LBD);
  
        // using isEmpty() function
        System.out.println("Is Linked Blocking Deque empty: "
                           + LBD.isEmpty());
    }
}

输出:

Linked Blocking Deque: [7855642, 35658786, 5278367, 74381793]
Is Linked Blocking Deque empty: false

示例2

// Java Program Demonstrate isEmpty()
// method of LinkedBlockingDeque
// when the list contains characters
  
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>();
  
        System.out.println("Linked Blocking Deque: " + LBD);
  
        // using isEmpty() function
        System.out.println("Is Linked Blocking Deque empty: "
                           + LBD.isEmpty());
    }
}

输出:

Linked Blocking Deque: []
Is Linked Blocking Deque empty: true