Java LinkedBlockingDeque clear()用法及代碼示例

LinkedBlockingDeque的clear()方法將擦除LinkedBlockingDeque容器中存在的所有元素。調用該函數後，容器將變為空。

用法:

public void clear()

參數：此方法不接受任何參數

返回值：此方法不返回任何內容。

以下示例程序旨在說明LinkedBlockingDeque的clear()方法：

示例1:

// Java Program Demonstrate clear() 
// 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); 
  
        // before using erase() function 
        System.out.println("Linked Blocking Deque: " + LBD); 
  
        LBD.clear(); 
        // after using erase() function 
        System.out.println("Linked Blocking Deque: " + LBD); 
    } 
}

輸出：

Linked Blocking Deque: [7855642, 35658786, 5278367, 74381793]
Linked Blocking Deque: []

示例2:

// Java Program Demonstrate clear() 
// 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>(); 
  
        // Add numbers to end of LinkedBlockingDeque 
        LBD.add("1"); 
        LBD.add("2"); 
        LBD.add("3"); 
        LBD.add("4"); 
  
        // before using erase() function 
        System.out.println("Linked Blocking Deque: " + LBD); 
  
        LBD.clear(); 
        // after using erase() function 
        System.out.println("Linked Blocking Deque: " + LBD); 
    } 
}

輸出：

Linked Blocking Deque: [1, 2, 3, 4]
Linked Blocking Deque: []

參考： https://docs.oracle.com/javase/7/docs/api/java/util/concurrent/LinkedBlockingDeque.html#clear()

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