void clear()
描述 (Description)
java.util.ArrayDeque.clear()方法从此deque删除所有元素。
声明 (Declaration)
以下是java.util.ArrayDeque.clear()方法的声明
public void clear()
参数 (Parameters)
NA
返回值 (Return Value)
此方法不返回任何值。
异常 (Exception)
NA
例子 (Example)
以下示例显示了java.util.ArrayDeque.clear()方法的用法。
package com.iowiki;
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");
}
}
让我们编译并运行上面的程序,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