java.util.ArrayDeque.contains(Object)%uA0如果此deque队列包含指定的元素，则返回true。
声明
以下是java.util.ArrayDeque.contains()方法的声明
public boolean contains(Object o)
参数
-
o%uA0-- 要检查包含在deque队列的对象。
返回值
如果此deque队列包含指定的元素此方法返回true，否则返回false。
异常
-
NA
例子
下面的示例演示java.util.ArrayDeque.contains()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) deque.add(18) // let us print all the elements available in deque for (Integer number : deque) { System.out.println("Number = " + number) } // deque contains element 10 boolean retval = deque.contains(10) if (retval == true) { System.out.println("element 10 is contained in the deque") } else { System.out.println("element 10 is not contained in the deque") } // deque does not contain element 25 boolean retval2 = deque.contains(25) if (retval2 == true) { System.out.println("element 25 is contained in the deque") } else { System.out.println("element 25 is not contained in the deque") } } }
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 Number = 18 element 10 is contained in the deque element 25 is not contained in the deque