| null | an as yet uncreated, or an invalid, Object Reference |
| true, false | the two possible values of a boolean variable |
| 29 | int constant - decimal representation |
| 035 | int constant - octal (base 8) representation |
| 0x1D | int constant - hexadecimal (base 16) representation |
When an int constant (as above) is assigned to a byte variable or a short variable, it is automatically converted to byte or short as appropriate (provided its value lies within the valid range for that type).
29L long constant - decimal representation 035L long constant - octal (base 8) representation 0x1DL long constant - hexadecimal (base 16) representation 18.0F float constant - the .0 is optional, the F is mandatory 1.8E1F float constant - exponent form, the F is mandatory .18E2F float constant - exponent form, the F is mandatory 18.0D double constant - the .0 and the D are optional 1.8E1D double constant - exponent form the D is optional .18E2D double constant - exponent form the D is optionalZero can be positive or negative. These are numerically equal but give different results in certain calculations eg:
A non-float constant such as a double cannot be assigned to a float variable. You must use a float literal viz:
float x = 18.9F;