long Java Keyword with Examples

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Key points about long Java Keyword

1. The long keyword is used to declare a variable as a long primitive type.
2. The long primitive type is a signed 64-bit type and is useful for those occasions where an int type is not large enough to hold the desired value.
3. The Long class is a wrapper class for the long primitive type. It defines MIN_VALUE and MAX_VALUE constants representing the range of values for this type.

long Java Keyword Example

For example, here is a program that computes the number of miles that light will travel in a specified number of days:

// Compute distance light travels using long variables. class Light { public static void main(String args[]) { int lightspeed; long days; long seconds; long distance; // approximate speed of light in miles per second lightspeed = 186000; days = 1000; // specify number of days here seconds = days * 24 * 60 * 60; // convert to seconds distance = lightspeed * seconds; // compute distance System.out.print("In " + days); System.out.print(" days light will travel about "); System.out.println(distance + " miles."); } }

This program generates the following output:

In 1000 days light will travel about 16070400000000 miles. 

Clearly, the result could not have been held in an int variable.