Java GregorianCalendar hashCode()用法及代碼示例

java.util.GregorianCalendar.hashCode()是Java中的內置函數，該函數為此GregorianCalendar實例生成哈希碼。

用法:

public int hashCode()

參數：該函數不接受任何參數。

返回值：此函數返回一個整數值，該值表示此GregorianCalendar實例的哈希碼。

例子：

Input : Thu Jul 24 00:53:29 UTC 1997
Output : 2121703905

Input : Tue Jul 24 00:54:11 UTC 2018
Output : -909136554

下麵的程序演示了java.util.GregorianCalendar.hashCode()函數：
示例1:

// Java Program to illustrate hashCode() function 
// of GregorianCalendar class 
  
import java.io.*; 
import java.util.*; 
  
class GFG { 
     public static void main(String[] args) { 
      
      // Create a new calendar 
      GregorianCalendar c = (GregorianCalendar)  
                GregorianCalendar.getInstance(); 
  
      // Display the current date and time 
      System.out.println("Current Date and Time : "
                                    + c.getTime()); 
        
      // Display hashcode for this calendar 
      System.out.println("Hash Code:" + c.hashCode()); 
   } 
}

輸出：

Current Date and Time : Fri Jul 27 11:43:16 UTC 2018
Hash Code:-612105832

示例2:

// Java Program to illustrate hashCode() function 
// of GregorianCalendar class 
  
import java.io.*; 
import java.util.*; 
  
class GFG { 
     public static void main(String[] args) { 
      
      // Create a new calendar 
      GregorianCalendar c = (GregorianCalendar)  
                 GregorianCalendar.getInstance(); 
  
      // Display the current date and time 
      System.out.println("Current Date and Time : "
                                     + c.getTime()); 
        
      c.add((GregorianCalendar.YEAR), -12); 
      System.out.println("Modified Date and Time : "
                                    + c.getTime()); 
        
      // Display hashcode for this calendar 
      System.out.println("Hash Code of the " +  
      "modified date and time:" + c.hashCode()); 
   } 
}

輸出：

Current Date and Time : Fri Jul 27 11:43:18 UTC 2018
Modified Date and Time : Thu Jul 27 11:43:18 UTC 2006
Hash Code of the modified date and time:-1346149059

參考： https://docs.oracle.com/javase/7/docs/api/java/util/GregorianCalendar.html#hashCode()

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注：本文由純淨天空篩選整理自RICHIK BHATTACHARJEE大神的英文原創作品 GregorianCalendar hashCode() Method in Java。非經特殊聲明，原始代碼版權歸原作者所有，本譯文未經允許或授權，請勿轉載或複製。