Term
| mixed-type expressions are |
|
Definition
| Having an int and a double in the same expression |
|
|
Term
| Java data is arranged in a hierarchy meaning |
|
Definition
| Types holding more info at the top, less at bottom |
|
|
Term
| Binary operators usually are |
|
Definition
|
|
Term
| Assignment and unary operators are |
|
Definition
|
|
Term
| You can tell Java to “try” to store closest value this is called |
|
Definition
"cast" or "type cast"
(Ex: int x = 123
byte b = (byte) x;) |
|
|
Term
| Floating-point numbers represent |
|
Definition
| approximations. So it can't be a .1 or 1/3 |
|
|
Term
| There are shorthand versions of all binary operators: |
|
Definition
a += b; // same as a = a + b;
a -= b; // same as a = a - b;
a /= b; // same as a = a / b;
a *= b; // same as a = a * b;
a %= b; // same as a = a % b; |
|
|
Term
| Increment and decrement operators are |
|
Definition
Unary operators (++, --) that add or subtract one. Can only be applied to a variable. You may use the operator before or after the variable. Both have exactly the same effect on variable. Variable is always incremented or decremented by 1.
(Ex: int a = 5;
++a; // a is now 6
a++; // a is now 7) |
|
|
Term
| The ++ and -- also have an |
|
Definition
|
|
Term
| With post-increment (after the variable) |
|
Definition
The original value is saved temporarily
The variable is updated
The original value is returned as the expression's value |
|
|
Term
| System.out.printf() allows us to |
|
Definition
|
|
Term
|
Definition
| Placeholders or format specifiers for each variable |
|
|
Term
|
Definition
%, followed by variable type. You must provide a variable for each specifier
(Ex: %f for reals, %d for integers, %s for string) |
|
|
Term
| Specifiers are fine tuned by using |
|
Definition
width, precision, and flags
(Ex: "%5d" – integer right-aligned in a 5 character field
"%5.2f" – real with 2 digits of precision, 5-wide
"%-20s" – string left aligned in a field 20 wide
"%,d" – integer with thousands separator |
|
|
Term
| In Java programming, functions: |
|
Definition
Are named blocks of code declared inside a class
Accept (take) one or more parameters (inputs)
Return a single value of a specific type |
|
|
Term
|
Definition
NOT passed explicitly as parameters. These are called instance methods
S.length(); --- OK
String.length(s); ----NOT OK |
|
|
Term
| Don't use a semi-colon when |
|
Definition
|
|
Term
|
Definition
| new String objects by transforming, (applying a rule), to existing ones |
|
|
Term
|
Definition
| s.replace("a","b"). Very useful for scrubbing user input. |
|
|
Term
| Each type has a class (object) type that "shadows" it. These are called |
|
Definition
| the wrapper types. Provide convenient methods for working with types |
|
|
Term
| Turning Strings into numbers is known as |
|
Definition
|
|
Term
| Coordinates used for x,y represent |
|
Definition
"Points" or infinitely small location located between pixels
(Ex: points 2,2 and 6,6) |
|
|
Term
| Shape-drawing methods come in two varieties |
|
Definition
| Those that draw an outline. Those that fill an area. |
|
|
