Java - Long hashCode() method



Description

The Java Long hashCode() method returns a hash code for this Long.

Declaration

Following is the declaration for java.lang.Long.hashCode() method

public int hashCode()

Parameters

NA

Return Value

This method returns a hash code value for this object, equal to the primitive long value represented by this Long object.

Exception

NA

Example 1

The following example shows the usage of Long hashCode() method to get a hashcode of an integer. We've created a Long variable and assigned it an Long object created using a positive long value. Then using hashCode() method, we're printing the hashcode of the Long object.

package com.tutorialspoint;
public class LongDemo {
   public static void main(String[] args) {
      Long i = new Long("20");
    
      /* returns a hash code value for this object, equal to the primitive
         long value represented by this Long object */
      int retval = i.hashCode();
      System.out.println("Value = " + retval);
   }
}

Output

Let us compile and run the above program, this will produce the following result −

Value = 20

Example 2

The following example shows the usage of Long hashCode() method to get a hashcode of an integer. We've created a Long variable and assigned it an Long object created using a negative long value. Then using hashCode() method, we're printing the hashcode of the Long object.

package com.tutorialspoint;
public class LongDemo {
   public static void main(String[] args) {
      Long i = new Long("-20");
    
      /* returns a hash code value for this object, equal to the primitive
         long value represented by this Long object */
      int retval = i.hashCode();
      System.out.println("Value = " + retval);
   }
}

Output

Let us compile and run the above program, this will produce the following result −

Value = 19

Example 3

The following example shows the usage of Long hashCode() method to get a hashcode of an integer. We've created a Long variable and assigned it an Long object created using a zero long value. Then using hashCode() method, we're printing the hashcode of the Long object.

package com.tutorialspoint;
public class LongDemo {
   public static void main(String[] args) {
      Long i = new Long("0");
    
      /* returns a hash code value for this object, equal to the primitive
         long value represented by this Long object */
      int retval = i.hashCode();
      System.out.println("Value = " + retval);
   }
}

Output

Let us compile and run the above program, this will produce the following result −

Value = 0

Example 4

The following example shows the usage of Long hashCode() method to get a hashcode of an integer. We've created a Long variable and assigned it an Long object created using a negative zero long value. Then using hashCode() method, we're printing the hashcode of the Long object.

package com.tutorialspoint;
public class LongDemo {
   public static void main(String[] args) {
      Long i = new Long("-0");
    
      /* returns a hash code value for this object, equal to the primitive
         long value represented by this Long object */
      int retval = i.hashCode();
      System.out.println("Value = " + retval);
   }
}

Output

Let us compile and run the above program, this will produce the following result −

Value = 0
java_lang_long.htm
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