stack peek_Java Stack peek（）方法与示例

不念不忘少年蓝@ 2023-03-05 12:41 4阅读 0赞

stack peek

## 堆栈类的peek()方法 **(**Stack Class peek() method**)** ##

*  **peek() method** is available in java.util package.
    
    **peek()方法**在java.util包中可用。
 *  **peek() method** is used to return the top element from this Stack and it retrieves elements without removing.
    
    **peek()方法**用于从此Stack中返回顶部元素，并且它不删除就检索元素。
 *  **peek() method** is a non-static method, it is accessible with the class object only and if we try to access the method with the class name then we will get an error.
    
    **peek()方法**是一种非静态方法，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。
 *  **peek() method** does not throw an exception at the time of returning top element.
    
    **peek()方法**在返回top元素时不会引发异常。

**Syntax:**

**句法：**

public Object peek();

**Parameter(s):**

**参数：**

*  It does not accept any parameter.
    
    它不接受任何参数。

**Return value:**

**返回值：**

The return type of the method is Object, it returns head element from the stack.

该方法的返回类型为Object ，它从堆栈中返回head元素。

**Example:**

**例：**

// Java program to demonstrate the example 
    // of Object peek() method of Stack Class
    
    import java.util.*;
    
    public class PeekOfStack {
        
     public static void main(String args[]) {
        
      // Instantiates Stack object
      Stack s = new Stack();
    
      // By using push() method isto
      // push the given onto the stack
      s.push(10);
      s.push(20);
      s.push(30);
      s.push(40);
      s.push(50);
    
      // Display Stack
      System.out.println("s:" + s);
    
      // By using peek() method is
      // to return the top element
      // without removing
      Object ele = s.peek();
    
      // Display Peek Element
      System.out.println("s.peek(): " + ele);
     }
    }

**Output**

**输出量**

s:[10, 20, 30, 40, 50]
    s.peek(): 50

> 翻译自: [https://www.includehelp.com/java/stack-peek-method-with-example.aspx][https_www.includehelp.com_java_stack-peek-method-with-example.aspx]

stack peek

[https_www.includehelp.com_java_stack-peek-method-with-example.aspx]: https://www.includehelp.com/java/stack-peek-method-with-example.aspx