Explain all Java Primitive Data Types?

boolean

1-bit. May take on the values true and false only.
true and false are describe constants of the language and are not the similar as True and False, TRUE and FALSE, zero and nonzero, 1 and 0 or any another numeric value. Booleans might not be cast into any other category of variable nor may any other variable be cast within a boolean.

byte

1 signed byte (two's complement). Covers values from -128 to 127.

short

2 bytes, signed (two's complement), -32,768 to 32,767

int

4 bytes, signed (two's complement). -2,147,483,648 to 2,147,483,647. Like all numeric kinds ints may be cast into other numeric types (byte, short, long, float, double). While lossy casts are done (e.g. int to byte) the conversion is completed modulo the length of the smaller kind.

long

8 bytes signed (two's complement). Ranges from -9,223,372,036,854,775,808 to +9,223,372,036,854,775,807.

float

4 bytes, IEEE 754. Covers a range from 1.40129846432481707e-45 to 3.40282346638528860e+38 (positive or negative).
Such as all numeric kinds floats may be cast into other numeric types (byte, short, long, int, double). When lossy casts to integer types are done (e.g. float to short) the fractional part is truncated and the conversion is completed modulo the length of the smaller kind.

double

8 bytes IEEE 754. Covers a range from 4.94065645841246544e-324d to 1.79769313486231570e+308d (positive or negative).

char

2 bytes, unsigned, Unicode, 0 to 65,535
Chars are not the similar as ints, bytes, shorts or Strings.