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CSE 2221 Midterm 1 Exam/92 Questions with verified Answers
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CSE 2221 Midterm 1 Exam/92 Questions with verified Answers
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CSE 2221 Midterm 1 Exam/92Questions with verified Answers
When was java developed? by who? - - Devleoped in early 1990s by Sun
Microsystems, now part of Oracle
- What is java based on? - - C/ C++
- Java was originally developed for: - - Interactive TV, but first sucessful in
Internet applications
- What is a Java compiler? - - The compiler checks the source code of a
program in a .java file and if there are no compile-time errors, bytecode for
the program is saved in a .class file
- .java file type? - - Just the source code, this is human readable
- .class file type? - - the bytecode generated by the java compiler is created
in a .class file, it is not human readable
- What is javac? - - The batch-style compiler that is part of the JDK
- Is your program in java run directly on the hardware? - - no, the JVM
executes the .class files by interpreting the bytecode and communicating
with the hardware, so you only need to compile once
Think of JVM as an intermediate between the hardware/OS and MyProg.class
- All java programs must have a method name what? - - public static void
main(String[] args)
- args is by convention
- public keyword means? - - anyone can use this class/method
- final keyword for a class means? - - no one can change the class by using
inheritance
- having a private constructor means? - - No one can create an object of
that class, this type of class is a utility class
- new keyword in java? - - creates a new object to which a variable
references to.
- Why do we use OSU components? - - They help practice best software
engineering practices
, - If you want to write output to a file instead of the console how would you
do that? - - use SimpleWriter1L("file.txt"), instead of leaving () empty as you
would normally
- Character-String literals - - Character-string constatns, aka String literals,
they are enclosed within double quotes, such as "Hello World!"
- String variable - - a variable that stores a character-string values
- variable - - name of a "location" that "stores" a value of a particular type
- type - - name of the set of all possible values that a varible might have, for
example a String might have values like "foo", "Hello World", etc.
int could have values like -1, 4, 18, etc
same applies for double, long, short, etc.
- program variable - - has a particular value at any one time during program
execution, and that value may change at other times
- mathematical varible - - stands for an arbitrary but fixed value
- Program vs mathematical variable? - - Program type has a corresponding
mathematical type that models it, at any given time in the program there is
a mathematical representation of the program variables
- mathematical type of String? - - string of characters
- mathematical type of boolean? - - boolean
- mathematical type of char? - - character
- mathematical type of int? - - integer (about -2 billion to 2 billion)
- mathematical type of double? - - real number between +- 10^+_308, with
15 significant digits in the decimal place
- How many primitive data types in java? - - 8
- How does OSU disginguish program code from mathematics? - - program
is in blue fixed-width, while mathematics is in green fixed-width, italic
- Declaring a variable vs initializing it? - - declaring a variable is just
creating the variable, which provides the name for a location to store its
value and indicate its program type, no value is assigned to it thought
Initializing is when you assign a value to a variable,
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