java isempty

ArrayDeque类isEmpty()方法 (ArrayDeque Class isEmpty() method)

• isEmpty() Method is available in java.lang package.

  isEmpty()方法在java.lang包中可用。

• isEmpty() Method is used to check whether this deque is "empty" or "non-empty".

  isEmpty()方法用于检查此双端队列是“空”还是“非空”。

• isEmpty() Method is a non-static method, it is accessible with the class object only and if we try to access the method with the class name then we will get an error.

  isEmpty()方法是一个非静态方法，只能通过类对象访问，如果尝试使用类名称访问该方法，则会收到错误消息。

• isEmpty() Method does not throw an exception at the time of checking the empty status of this deque.

  在检查此双端队列的空状态时， isEmpty()方法不会引发异常。

Syntax:

句法：

    public boolean isEmpty();

Parameter(s):

参数：

• It does not accept any parameter.

  它不接受任何参数。

Return value:

返回值：

The return type of the method is boolean, it returns true if this queue is empty else it returns false.

方法的返回类型为boolean ，如果此队列为空，则返回true ，否则返回false 。

Example:

例：

// Java program to demonstrate the example 
// of boolean isEmpty() method of ArrayDeque 
import java.util.*;
public class IsEmptyOfArrayDeque {
public static void main(String[] args) {
// Creating an ArrayDeque with initial capacity of
// storing elements
Deque < String > d_queue = new ArrayDeque < String > (10);
// By using add() method to add elements
// in ArrayDeque
d_queue.add("C");
d_queue.add("C++");
d_queue.add("Java");
d_queue.add("Php");
d_queue.add("DotNet");
// Display Deque Elements
System.out.println("d_queue : ");
System.out.println("ArrayDeque Elements = " + d_queue);
System.out.println();
// By using isEmpty() method is to check the 
// empty status of ArrayDeque
boolean b = d_queue.isEmpty();
System.out.println("d_queue.isEmpty() : " + b);
}
}

Output

输出量

d_queue : 
ArrayDeque Elements = [C, C++, Java, Php, DotNet]d_queue.isEmpty() : false

翻译自: https://www.includehelp.com/java/arraydeque-isempty-method-with-example.aspx

java isempty