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Java - Long Class

Introduction

The Java Long class wraps a value of the primitive type long in an object. An object of type Long contains a single field whose type is long.

Class Declaration

Following is the declaration for java.lang.Long class −

public final class Long
   extends Number
      implements Comparable<Long>

Field

Following are the fields for java.lang.Long class −

  • static long MAX_VALUE − This is a constant holding the maximum value a long can have, 263-1.

  • static long MIN_VALUE − This is a constant holding the minimum value a long can have, -263.

  • static int SIZE − This is the number of bits used to represent a long value in two's complement binary form.

  • static Class<Long> TYPE − This is the class instance representing the primitive type long.

YPE − This is the class instance representing the primitive type int.

Class constructors

Sr.No. Constructor & Description
1

Long(long value)

This constructs a newly allocated Long object that represents the specified long argument.
2

Long(String s)

This constructs a newly allocated Long object that represents the long value indicated by the String parameter.

Class methods

Methods inherited

This class inherits methods from the following classes −

  • java.lang.Object

Getting a Long Object from A String Example

The following example shows the usage of Long class to get int from a string.

package com.tutorialspoint;

public class LongDemo {

   public static void main(String[] args) {

      // create a String s and assign value to it
      String s = "+120";

      // create a Long object l
      Long l;

      // get the value of long from string
      l = Long.valueOf(s);

      // print the value
      System.out.println( "Long value of string " + s + " is " + l );
   }
}

Output

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

Long value of string +120 is 120

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