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Variables are nothing but reserved memory locations to store values.

• Data Types

• Variables

• Primitive Data Types

• Reference/Object Data Types

are created using defined constructors

of the classes. They are used to access objects. These

variables are declared to be of a specific type that cannot be

changed. For example, Employee, Puppy, etc.

• Data Types

• Variables

• Primitive Data Types

• Reference/Object Data Types

1 byte - Store whole numbers from -128 to 127

• Char

• Byte

• Short

• Int

2 bytes whole numbers -37, 768 to 37, 767

• Char

• Byte

• Short

• Int

4 bytes, store whole numbers from -2, 147, 483, 648 to 2, 147, 483, 647

• Char

• Byte

• Short

• Int

8 bytes, stores whole numbers from -9, 223, 372, 036, 854, 775, 808 to 9, 223, 372, 036, 854, 775, 807

• Char

• Long

• Float

• Double

4 bytes, stores fractional numbers, sufficient for storing 6 to 7 decimal digits

• Char

• Long

• Float

• Double

8 bytes, stores fractional numbers. Sufficient for storing 15 decimal digits

• Char

• Long

• Float

• Double

1 bit, stores true or false values

• Char

• Long

• Boolean

• Double

2 bytes, Stores single character/letter or ASCII values

• Char

• Long

• Boolean

• Double