Computer Programming Ch. 4 and 6
overloading
Having more than one method with the same name but differ- ent parameters. When you invoke an overloaded method, Java knows which version to use by looking at the arguments you provide.
dead code
Part of a program that can never be executed, often because it appears after a return statement.
Boolean Methods
Predicate methods. Most common is inside conditional statements. Common to give names sounding like yes/no true/false questions. Return is boolean- every expression returned is a boolean expression
nesting
Putting a conditional statement inside one or both branches of another conditional statement.
recursion
The process of invoking the same method you are currently executing.
return value
The value provided as the result of a method invocation.
flag=true;
initilization
unary minus
1 operand (-x)
logical operators
!, &&, ||
arithmetic operators
*, /, %, +, -
overloading
2 methods in the same scope can have the same name only if they have different parameter lists ( different in number and type )
binary minus
2 operand (x-y)
assignment operator
=
comparison operator
==
Don't compare values of type double with
== or !=
conditional/relational operators
==, !=, >, < >=, <=
conditional
A block of statements that may or may not be executed depending on some condition. If statements allowing code to respond in different ways
base case
A condition that causes a recursive method not to make a recursive call.
void
A special return type that indicates a void method; that is, one that does not return a value.
boolean
A type of variable that can contain only the two values true and false.
flag
A variable (usually boolean) that records a condition or status infor mation.
chaining
A way of joining several conditional statements in sequence. Check for a number of related conditionals
logical operator
An operator that combines boolean values and produces boolean values. AKA arithmetic operators. Conditional, relational, and comparison.
conditional operator
An operator that compares two values and produces a boolean that indicates the relationship between the operands.
typecast
An operator that converts from one type to another. In Java it appears as a type name in parentheses, like (int).
modulus
An operator that works on integers and yields the remainder when one number is divided by another. In Java it is denoted with a percent sign(%). Returns remainder. Helpful determining if odd or even.
relational and logic operators return
Boolean result
scaffolding
Code that is used during program development but is not part of the final version.
5 characteristics of a variable
Data type, name, what value is stored, scope, life time
return type
The part of a method declaration that indicates what type of value the method returns
Leap of Faith
When you come to a method invocation instead of following the flow of execution, assuming the method works correctly
return statement
causes method to stop immediately. Think of the " go to jail" stop on monopoly. To check for data that might stop errors. Any code following it will not return.
double
data type of the value being returned
boolean flag;
declaration
condition
expression in parantheses
alternative execution
gives 2 paths to follow as result of an if statement. if/else
Incremental Development
identify what output the program needs to produce, then identify what input is required and what process needs to be applied to input to produce required output
if there is a return
no "else" is needed
life time
point where its declared until the end of the code block; when it's removed from memory
type conversion
whenever you try to "add" 2 expressions, if one of them is a String, Java converts the other to a String performing string concatenation. EX. System.out.print("The answer is" + x)
scope
where you can access the variable
relational operators
x==y x!=y x>y x<y x>=y x<=y
