java.util.ArrayDeque.clear()%uA0方法移除此deque队列的所有元素。
声明
以下是java.util.ArrayDeque.clear()方法的声明
public void clear()
参数
-
NA
返回值
此方法不返回任何值。
异常
-
NA
例子
下面的示例演示java.util.ArrayDeque.clear()方法的用法。
package com.yiibai import java.util.ArrayDeque import java.util.Deque public class ArrayDequeDemo { public static void main(String[] args) { // create an empty array deque with an initial capacity Deque<Integer> deque = new ArrayDeque<Integer>(8) // use add() method to add elements in the deque deque.add(20) deque.add(30) deque.add(10) // let us print all the elements available in deque for (Integer number : deque) { System.out.println("Number = " + number) } // finding size of this deque int retval = deque.size() System.out.println("Deque consists of "+ retval +" elements") System.out.println("Performing clear operation !!") deque.clear() retval = deque.size() System.out.println("Now, deque consists of "+ retval +" elements") } }
让我们来编译和运行上面的程序，这将产生以下结果：
Number = 20 Number = 30 Number = 10 Deque consists of 3 elements Performing clear operation !! Now, deque consists of 0 elements