Java Nepali tutorial series: Variables


We are going to take a look at java variables today.

What is a variable?

In a Java program variable acts like a container that holds a certain value. Each variable must have it’s own data type.

8 primitive data types are as follows:

  • byte : Byte is an an 8-bit signed two’s complement integer. It holds value from -128 to 127.
  • short: Short is a 16-bit signed two’s complement integer. It’s value ranges from  -32,768 to32,767.
  • int: Int is 32 bit.
  • long: Long is 64 bit.  It has minimum value of -2^31 and a maximum value of 2^31-1.
  • float: 32 bit. It is used for floating point i.e fractional numbers.
  • double: 64 bit.  Double is used for fractional numbers. It is used way more than float in Java.
  • char: It is a single 16 bit unicode character. It holds a single character value.
  • boolean: A boolean is either true or false. Nothing more.




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