- Java.lang Package classes
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Java - Integer hashCode() method
Description
The Java Integer hashCode() method returns a hash code for this Integer.
Declaration
Following is the declaration for java.lang.Integer.hashCode() method
public int hashCode()
Parameters
NA
Return Value
This method returns a hash code value for this object, equal to the primitive int value represented by this Integer object.
Exception
NA
Example 1
The following example shows the usage of Integer hashCode() method to get a hashcode of an integer. We've created a Integer variable and assigned it an Integer object created using a positive int value. Then using hashCode() method, we're printing the hashcode of the Integer object.
package com.tutorialspoint; public class IntegerDemo { public static void main(String[] args) { Integer i = new Integer("20"); /* returns a hash code value for this object, equal to the primitive int value represented by this Integer 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 Integer hashCode() method to get a hashcode of an integer. We've created a Integer variable and assigned it an Integer object created using a negative int value. Then using hashCode() method, we're printing the hashcode of the Integer object.
package com.tutorialspoint; public class IntegerDemo { public static void main(String[] args) { Integer i = new Integer("-20"); /* returns a hash code value for this object, equal to the primitive int value represented by this Integer 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 3
The following example shows the usage of Integer hashCode() method to get a hashcode of an integer. We've created a Integer variable and assigned it an Integer object created using a zero int value. Then using hashCode() method, we're printing the hashcode of the Integer object.
package com.tutorialspoint; public class IntegerDemo { public static void main(String[] args) { Integer i = new Integer("0"); /* returns a hash code value for this object, equal to the primitive int value represented by this Integer 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 Integer hashCode() method to get a hashcode of an integer. We've created a Integer variable and assigned it an Integer object created using a negative zero int value. Then using hashCode() method, we're printing the hashcode of the Integer object.
package com.tutorialspoint; public class IntegerDemo { public static void main(String[] args) { Integer i = new Integer("-0"); /* returns a hash code value for this object, equal to the primitive int value represented by this Integer 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