Java - Integer longValue() method

Description

The Java Integer longValue() method returns the value of this Integer as a long.

Declaration

Following is the declaration for java.lang.Integer.longValue() method

public long longValue()

Parameters

NA

Return Value

This method returns the numeric value represented by this object after conversion to type long.

Exception

NA

Getting long value from an Integer Object having Positive int value Example

The following example shows the usage of Integer longValue() method to get long value from an Integer object. We've created a Integer variable and assign it a Integer object containing a positive integer number. Then using longValue method, we're obtaining the long value from this object and then printed it.

package com.tutorialspoint;
public class IntegerDemo {
   public static void main(String[] args) {
      Integer obj = new Integer(5);
 
      // returns the value of this Integer as a long
      long l = obj.longValue();
      System.out.println("Value of l = " + l);
   }
}

Output

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

Value of l = 5

Getting long value from an Integer Object having Negative int value Example

The following example shows the usage of Integer longValue() method to get long value from an Integer object. We've created a Integer variable and assign it a Integer object containing a negative integer number. Then using longValue method, we're obtaining the long value from this object and then printed it.

package com.tutorialspoint;
public class IntegerDemo {
   public static void main(String[] args) {
      Integer obj = new Integer(-5);
 
      // returns the value of this Integer as a long
      long l = obj.longValue();
      System.out.println("Value of l = " + l);
   }
}

Output

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

Value of l = -5

Getting long value from an Integer Object having Positive Zero value Example

The following example shows the usage of Integer longValue() method to get long value from an Integer object. We've created a Integer variable and assign it a Integer object containing a zero value. Then using longValue method, we're obtaining the long value from this object and then printed it.

package com.tutorialspoint;
public class IntegerDemo {
   public static void main(String[] args) {
      Integer obj = new Integer(0);
 
      // returns the value of this Integer as a long
      long l = obj.longValue();
      System.out.println("Value of l = " + l);
   }
}

Output

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

Value of l = 0

Getting long value from an Integer Object having Negative Zero value Example

The following example shows the usage of Integer longValue() method to get long value from an Integer object. We've created a Integer variable and assign it a Integer object containing a negative zero value. Then using longValue method, we're obtaining the long value from this object and then printed it.

package com.tutorialspoint;
public class IntegerDemo {
   public static void main(String[] args) {
      Integer obj = new Integer(-0);
 
      // returns the value of this Integer as a long
      long l = obj.longValue();
      System.out.println("Value of l = " + l);
   }
}

Output

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

Value of l = 0