Java CopyOnWriteArraySet clear()用法及代碼示例

CopyOnWriteArraySet的clear()方法將擦除Set中的所有元素。調用函數後，Set的大小變為零。

用法:

public void clear()

返回值：該函數不返回任何內容。

以下示例程序旨在說明上述函數：

示例1:

// Java Program to illustrate the CopyOnWriteArraySet 
// clear() method in Java 
  
import java.util.concurrent.CopyOnWriteArraySet; 
import java.util.*; 
  
public class GFG { 
    public static void main(String[] args) 
    { 
  
        // create object of CopyOnWriteArraySet 
        CopyOnWriteArraySet<Integer> ArrSet 
            = new CopyOnWriteArraySet<Integer>(); 
  
        // Add elements 
        ArrSet.add(32); 
        ArrSet.add(67); 
        ArrSet.add(98); 
        ArrSet.add(98); 
  
        // print CopyOnWriteArraySet 
        System.out.println("CopyOnWriteArraySet: "
                           + ArrSet); 
  
        // Clear the CopyOnWriteArraySet 
        // Using clear() method 
        ArrSet.clear(); 
  
        System.out.println("\nCopyOnWriteArraySet cleared\n"); 
  
        // Print the updated CopyOnWriteArraySet 
        System.out.println("Updated CopyOnWriteArraySet: "
                           + ArrSet); 
    } 
}

輸出：

CopyOnWriteArraySet: [32, 67, 98]

CopyOnWriteArraySet cleared

Updated CopyOnWriteArraySet: []

示例2:

// Java Program to illustrate the CopyOnWriteArraySet 
// clear() method in Java 
  
import java.util.concurrent.CopyOnWriteArraySet; 
import java.util.*; 
  
public class GFG { 
    public static void main(String[] args) 
    { 
  
        // create object of CopyOnWriteArraySet 
        CopyOnWriteArraySet<String> ArrSet 
            = new CopyOnWriteArraySet<String>(); 
  
        // Add elements 
        ArrSet.add("gopal"); 
        ArrSet.add("gfg"); 
        ArrSet.add("jgec"); 
        ArrSet.add("jgec"); 
  
        // print CopyOnWriteArraySet 
        System.out.println("CopyOnWriteArraySet: "
                           + ArrSet); 
  
        // Clear the CopyOnWriteArraySet 
        // Using clear() method 
        ArrSet.clear(); 
  
        System.out.println("\nCopyOnWriteArraySet cleared\n"); 
  
        // Print the updated CopyOnWriteArraySet 
        System.out.println("Updated CopyOnWriteArraySet: "
                           + ArrSet); 
    } 
}

輸出：

CopyOnWriteArraySet: [gopal, gfg, jgec]

CopyOnWriteArraySet cleared

Updated CopyOnWriteArraySet: []

參考： https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/CopyOnWriteArraySet.html#clear–

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