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AP Computer Science Exam Review - Java Terms Exam Questions and Answers
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AP Computer Science Exam Review - Java Terms Exam
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AP Computer Science Exam Review - Java Terms Exam Abstract class - Answer -A class that contains one or more abstract methods, and therefore can never be instantiated. Abstract classes are defined so that other classes can extend them and make them concrete by implementing the abstract methods.Abstract method - Answer -A method that has no implementation.
Argument - Answer -A data item specified in a method call. An argument can be a literal
value or a variable. Example: .get(2); //2 is the argument
Array - Answer -A collection of data items, all of the same type, in which each item's position is uniquely designated by an integer.
Block - Answer -any code between matching squiggly brackets. Example: { x = 1; }
Boolean - Answer -Refers to an expression or variable that can have only a true or false
value.
Break - Answer -A keyword that exits you out of a loop or switch.
Casting (Type Casting) - Answer -Explicit conversion from one data type to another. Example: double var = 3; int ans = (int) var;
Char - Answer -a keyword used to declare a variable of type character
Class - Answer -defines the implementation of a particular kind of object. A class definition defines instance and class variables and methods, as well as specifying the interfaces the class implements and the immediate superclass of the class. Example: public class myClass(){
}
Class variable (static field) - Answer -A data item associated with a particular class as a whole--not with particular instances of the class. Class variables are defined in class definitions. Compiler - Answer -A program to translate source code into code to be executed by a computer. The Java compiler translates source code written in the Java programming language into bytecode for the Java virtual machine.
Continue - Answer -A keyword that forces the abrupt end of the current loop iteration and begins another iteration.
constructor - Answer -A pseudo-method that creates an object. Constructors are methods with the same name as their class. Constructors are invoked using the new keyword. Example:
public class myClass{
// a constructor that takes one parameter
public myClass(int var){ } }
Continue - Answer -a keyword used to resume program execution at the end of the current loop.
Declaration - Answer -A statement that creates a variable of a specific data type. Example: int v;
Default - Answer -A keyword optionally used after all "case" conditions in a "switch" statement. If all "case" conditions are not matched by the value of the "switch" variable, the "default" keyword will be executed.
Do - Answer -A keyword used to declare a loop that will iterate a block of statements. The loop`s exit condition can be specified with the "while" keyword. A do-while loop is guaranteed to run at least once.
double - Answer -A keyword used to define a variable of type double.
else - Answer -introduces statements that are executed when the condition in an if statement isn't true.
Exception - Answer -An event during program execution that prevents the program from
continuing normally; generally, an error.
Extends - Answer -Class X extends class Y to add functionality, either by adding fields or methods to class Y, or by overriding methods of class Y. An interface extends another interface by adding methods. Class X is said to be a subclass of class Y.
Field - Answer -A data member of a class. Unless specified otherwise, a field is not static.
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