Java - 列舉 hashCode() 方法

描述

Java Enum hashCode() 方法返回此列舉常量的雜湊碼。

宣告

以下是 java.lang.Enum.hashCode() 方法的宣告

public final int hashCode()

引數

無

返回值

此方法返回此列舉常量的雜湊碼。

異常

無

獲取列舉的雜湊碼示例

以下示例演示了列舉中 hashCode() 方法的使用。

package com.tutorialspoint;

// enum showing programming languages
enum Language {
   C, Java, PHP;
}

public class EnumDemo {

   public static void main(String args[]) {

      // returns the name and hashCode of this enum constant
      System.out.print("Programming in " + Language.C.toString());      
      System.out.println(", Hashcode = " + Language.C.hashCode()); 
      System.out.print("Programming in " + Language.Java.toString());  
      System.out.println(", Hashcode = " + Language.Java.hashCode()); 
      System.out.print("Programming in " + Language.PHP.toString());  
      System.out.println(", Hashcode = " + Language.PHP.hashCode());    
   }
} 

讓我們編譯並執行以上程式，這將產生以下結果：

Programming in C, Hashcode = 745160567
Programming in Java, Hashcode = 610984013
Programming in PHP, Hashcode = 1644443712

獲取列舉的雜湊碼示例

以下示例演示了另一個列舉中 hashCode() 方法的使用。

package com.tutorialspoint;

// enum showing topics covered under Tutorials
enum Tutorials {  
   Java, HTML, Python; 
} 
 
public class EnumDemo { 

   public static void main(String args[]) {
 
      Tutorials t1, t2, t3; 
    
      t1 = Tutorials.Java; 
      t2 = Tutorials.HTML; 
      t3 = Tutorials.Python; 
    
      System.out.print("Programming in " + t1.toString());      
      System.out.println(", Hashcode = " + t1.hashCode()); 
      System.out.print("Programming in " + t2.toString());  
      System.out.println(", Hashcode = " + t2.hashCode()); 
      System.out.print("Programming in " + t3.toString());  
      System.out.println(", Hashcode = " + t3.hashCode());
   } 
} 

讓我們編譯並執行以上程式，這將產生以下結果：

Programming in Java, Hashcode = 745160567
Programming in HTML, Hashcode = 610984013
Programming in Python, Hashcode = 1644443712