Hashtable类hashCode()方法 (Hashtable Class hashCode() method)

• hashCode() method is available in java.util package.

  hashCode()方法在java.util包中可用。

• hashCode() method is used to return the hash code value for this object in this Hashtable.

  hashCode()方法用于返回此哈希表中此对象的哈希码值。

• hashCode() 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.

  hashCode()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。

• hashCode() method does not throw an exception at the time of returning hash code value.

  hashCode()方法在返回哈希码值时不会引发异常。

Syntax:

句法：

public int hashCode();

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 int, it returns hash code value of this Hashtable.

方法的返回类型为int ，它返回此Hashtable的哈希码值。

Example:

例：

// Java program to demonstrate the example // of int hashCode() method of Hashtable import java.util.*;public class HashCodeOfHashtable {
       public static void main(String[] args) {
           // Instantiate a hashtable object          Hashtable ht = new Hashtable();        // By using put() method is to        // add the linked values in an        // Hashtable ht        ht.put(10, "C");        ht.put(20, "C++");        ht.put(30, "JAVA");        ht.put(40, "PHP");        ht.put(50, "SFDC");        // Display Hashtable        System.out.println("Hashtable: " + ht);        // By using hashCode() method is to return        // the hash code of this Hashtable        int hash_code = ht.hashCode();        // Display hash code        System.out.println("ht.hashCode(): " + hash_code);    }}

Output

输出量

Hashtable: {10=C, 20=C++, 30=JAVA, 40=PHP, 50=SFDC}ht.hashCode(): 4956940

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