java push技术 java中的push

java中的push方法

(ArrayDeque Class push() method)

• push() Method
  push()方法在java.lang包中可用。
• push() Method
  push()方法用于将元素压入此双端队列表示的堆栈上。
• push() Method
  push()方法是一个非静态方法，只能通过类对象访问，如果尝试使用类名称访问该方法，则会收到错误消息。
• push() Method may throw an exception at the time of pushing an element onto the stack.NullPointerException: This exception may throw when the given element is null exists.
  push()方法在将元素压入堆栈时可能会引发异常。 NullPointerException

Syntax:

句法：

public void push(T element);

Parameter(s):

参数：

• T element
  T element –表示要成功推入堆栈的元素。

Return value:

返回值：

The return type of the method is void, it returns nothing.

该方法的返回类型为void ，不返回任何内容。

Example:

例：

// Java program to demonstrate the example 
// of void push(T element) method of ArrayDeque 

import java.util.*;

public class PushOfArrayDeque {
    public static void main(String[] args) {
        // Creating an ArrayDeque with initial capacity of
        // storing elements
        Deque < String > d_queue = new ArrayDeque < String > (10);

        // By using add() method to add elements
        // in ArrayDeque
        d_queue.add("C");
        d_queue.add("C++");
        d_queue.add("Java");
        d_queue.add("Php");
        d_queue.add("DotNet");

        // Display Deque Elements
        System.out.println("d_queue before push(): ");
        System.out.println("ArrayDeque Elements = " + d_queue);

        System.out.println();

        // By using push() method to push the
        // elements at the front of ArrayDeque
        d_queue.push("Python");

        System.out.println();

        // Display Deque Elements
        System.out.println("d_queue after push(): ");
        System.out.println("ArrayDeque Elements = " + d_queue);
    }
}

Output

输出量

d_queue before push(): 
ArrayDeque Elements = [C, C++, Java, Php, DotNet]


d_queue after push(): 
ArrayDeque Elements = [Python, C, C++, Java, Php, DotNet]