Java ArrayDeque removeFirstOccurrence()方法

java.util.ArrayDeque.removeFirstOccurrence(Object) 此方法删除此双端队列中指定元素的首次出现。

1 语法

public boolean removeFirstOccurrence(Object o)

2 参数

o：首次出现的元素，将从此双端队列移除（如果存在）。

3 返回值

如果双端队列包含指定的元素，则此方法返回true。

4 示例 

package com.yiidian;

/**
 * 一点教程网： http://www.yiidian.com
 */
/**
 * java.util.ArrayDeque.removeFirstOccurrence(Object)方法的例子
 */
import java.util.ArrayDeque;
import java.util.Deque;

public class Demo {
    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(15);
        deque.add(20);
        deque.add(25);
        deque.add(20);

        // let us print all the elements available in deque
        for (Integer number : deque) {
            System.out.println("Number = " + number);
        }

        // this will remove first occurrence of element 20
        deque.removeFirstOccurrence(20);

        System.out.println("Remaining Elements: ");
        // let us print all the elements available in deque
        for (Integer number : deque) {
            System.out.println("Number = " + number);
        }
    }
}

输出结果为：

Number = 15
Number = 20
Number = 25
Number = 20
Remaining Elements: 
Number = 15
Number = 25
Number = 20