Java LinkedHashSet clear()用法及代码示例

java.util.LinkedHashSet类的clear()方法用于从该集合中删除所有元素。该调用返回后，该集合将为空。

用法:

public void clear()

返回值：此方法不返回任何内容。

以下示例说明了clear()方法。

示例1:

// Java program to demonstrate 
// clear() method 
// for Integer value 
  
import java.util.*; 
  
public class GFG1 { 
    public static void main(String[] argv) throws Exception 
    { 
        try { 
  
            // Create the object of LinkedHashSet<Integer> 
            LinkedHashSet<Integer> 
                linkset = new LinkedHashSet<Integer>(); 
  
            // populate hash set 
            linkset.add(10); 
            linkset.add(20); 
            linkset.add(30); 
  
            // print the LinkedHashSet 
            System.out.println("LinkedHashSet: "
                               + linkset); 
  
            // clear set values 
            // using clear() method 
            linkset.clear(); 
  
            // print the LinkedHashSet 
            System.out.println("LinkedHashSet after "
                               + "use of clear() method: "
                               + linkset); 
        } 
  
        catch (NullPointerException e) { 
  
            System.out.println("Exception thrown : " + e); 
        } 
    } 
}

输出：

LinkedHashSet: [10, 20, 30]
LinkedHashSet after use of clear() method: []

示例2:

// Java program to demonstrate 
// clear() method 
// for String value 
  
import java.util.*; 
  
public class GFG1 { 
    public static void main(String[] argv) throws Exception 
    { 
        try { 
  
            // Create the object of LinkedHashSet<Integer> 
            LinkedHashSet<String> 
                linkset = new LinkedHashSet<String>(); 
  
            // populate hash set 
            linkset.add("A"); 
            linkset.add("B"); 
            linkset.add("C"); 
  
            // print the LinkedHashSet 
            System.out.println("LinkedHashSet: "
                               + linkset); 
  
            // clear set values 
            // using clear() method 
            linkset.clear(); 
  
            // print the LinkedHashSet 
            System.out.println("LinkedHashSet after "
                               + "use of clear() method: "
                               + linkset); 
        } 
  
        catch (NullPointerException e) { 
  
            System.out.println("Exception thrown : " + e); 
        } 
    } 
}

输出：

LinkedHashSet: [A, B, C]
LinkedHashSet after use of clear() method: []

相关用法

注：本文由纯净天空筛选整理自RohitPrasad3大神的英文原创作品 LinkedHashSet clear() method in Java with Examples。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。