Java AbstractSequentialList isEmpty()用法及代码示例

Java中的AbstractSequentialList的isEmpty()方法用于检查此AbstractSequentialList是否为空。它返回一个表示是否相同的布尔值。

用法:

public boolean isEmpty()

参数：此函数没有参数。

返回：该方法返回一个布尔值，该值表明AbstractSequentialList的实例为空。

以下示例说明了AbstractSequentialList.isEmpty()方法：

范例1：

// Java code to demonstrate the working of 
// isEmpty() method in AbstractSequentialList 
  
import java.util.*; 
  
public class GFG { 
    public static void main(String[] args) 
    { 
        // creating an AbstractSequentialList 
        AbstractSequentialList<Integer> arr 
            = new LinkedList<Integer>(); 
  
        // using add() to initialize values 
        // [1, 2, 3, 4] 
        arr.add(1); 
        arr.add(2); 
        arr.add(3); 
        arr.add(4); 
  
        // print AbstractSequentialList 
        System.out.println("AbstractSequentialList:"
                           + arr); 
  
        // Check if AbstractSequentialList is empty 
        // using isEmpty() value 
        System.out.println("Is AbstractSequentialList empty? "
                           + arr.isEmpty()); 
    } 
}

输出：

AbstractSequentialList:[1, 2, 3, 4]
Is AbstractSequentialList empty? false

范例2：

// Java code to demonstrate the working of 
// isEmpty() method in AbstractSequentialList 
  
import java.util.*; 
  
public class GFG { 
    public static void main(String[] args) 
    { 
        // creating an AbstractSequentialList 
        AbstractSequentialList<String> arr 
            = new LinkedList<String>(); 
  
        // print AbstractSequentialList 
        System.out.println("AbstractSequentialList:"
                           + arr); 
  
        // Check if AbstractSequentialList is empty 
        // using isEmpty() value 
        System.out.println("Is AbstractSequentialList empty? "
                           + arr.isEmpty()); 
    } 
}

输出：

AbstractSequentialList:[]
Is AbstractSequentialList empty? true

相关用法

注：本文由纯净天空筛选整理自Code_r大神的英文原创作品 AbstractSequentialList isEmpty() method in Java with Example。非经特殊声明，原始代码版权归原作者所有，本译文未经允许或授权，请勿转载或复制。