CSCI 111 Final Exam
A while-loop is an ___________ controlled loop
event
Declaring a constant
final double PI = 3.14159;
Logic error
produces incorrect results
What is the structure of a simple java program?
public class Welcome{ public static void main(String[]args){ System.out.println("Welcome to Java!"); } }
How to write a Switch with break
switch (num){ case 1: System.out.println("one"); break; case 2: System.out.println("two");
What are overloaded methods?
they enable you to define the methods with the same name as long as their signatures are different (different parameter list)
What is a while-loop that never evaluates to false?
Infinite loop
Syntax error
detected by a compiler
1110001 into a decimal number
(1 x 2^6) + (1 x 2^5) + (1 x 2^4) + (0 x 2^3) + (0 x 2^2) + (0 x 2^1) + ( 0 x 2^1) + (1 x 2^0) = 113
What are the numeric operations
+ - * / %
What are the assignment operators
+= -= *= /= %=
What is the syntax for method header?
modifier returnValueType methodName(list of formal parameters)
Construct an if-statement that outputs "hot" if the temp is above 90 degrees or "cold" if the temperature is below 55 degrees
((Attempt on paper))
What is assembly language?
-An assembler is used to convert assembly language programs into machine code
What is high level language?
-English like language
What is machine language?
-Written in binary code -set of primitive instructions
What are the 6 data types?
-byte -short -int -long -float -double
Writing a class in Java
-class is a template -an object is an instance of class -a class uses variables to define data fields & methods to define actions -constructors are invoked to create a new object and designed to perform initializing actions
How often for a for-loop execute?
A fixed number of times
What does 52 % 8 yield?
4 (the remainder)
What is a method?
A collection of statements grouped together to perform an operation
What is an array?
A data structure that represents a collection of the same types of data
Can an int be assigned to a double and vice versa?
An int can be assigned to a double but a double cannot be assigned to an int
Runtime error
Causes program to abort
What are the values in an array called?
Element
How is a constructor named?
It must have the same name as the class itself
What is a void method?
It preforms actions
Does a constructor have a return type?
No it does not have a return type and it is invoked using the new operator
Does a void method have a return statement?
No it does not return a value
What must formal and actual parameters match in? (3)
Number Order Data Type
What is an iteration?
One execution of a loop block
Public vs Private class
Public is acceptable to all clients, private is not
Using sample as your array name, how can you represent the length of an array?
Sample.length
Scope of a Variable
Start from the declaration of a variable and continues to the end of the block that contains the variable
Pass by Reference
The declared functions are declared as references, so any changes made to the reference can be passed through the argument
Naming a variable
Use lowercase letters unless it is multiple words, then use lowercase for the first letter, and uppercase each word after
Local Variable
Variable thats declared within the body of a method
Pass by Value
When invoking a method with an argument, the value of the argument is passed to a parameter
When is a while loop used?
When we don't know how many iterations are to be preformed
1110001 into a hexadecimal number
add a zero to the beginning 0111 / 0001 = 71
How to create an array
arrayRefVar = new dataType[arraySize]; ex: myList = new double[10]
A for-loop is a ___________ controlled loop
count
Declare & create an array
dataType[ ] arrayRefVar = new.dataType[arraySize];
How to declare an array
dataType[ ] arrayRefVar; ex: double[ ] myList;
Declaring a variable
int x; double radius; char a;
How to run a file?
java TestFile
How to compile a file?
javac TestFile.java
What do you call a method from the same class?
methodName(yyy,zzz)
