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CS2 Midterm Questions & 100% Verified Correct Answers with complete solutions (Latest update
CS2 Midterm Questions & 100% Verified Correct Answers with complete solutions (Latest update
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CS2 Midterm1. Java is compiled: Have to run compiler to turn java code into machine instructions (byte code)
before you run it
2. Java is statically and strictly typed: must explicitly declare type of object or variable (ex: int,
string)
3. Much more verbose
4. Faster b/c it's compiled. Does not need time to interpret code b/c it's already compiled into
machine instructions. - ANS-Java vs Python
Class! - ANS-Everything is a ____
Javac = Java Compiler
JVM = Java Virtual Machine (runs the compiled code) - ANS-Javac vs JVM
1. Java Standard Edition
2. Java Runtime Environment : The JVM and additional code for all the libraries included by
default with Java. Lets you run programs but does not let you compile them.
3. Java Development Kit: JRE + JAVAC
4. Java Archive: A zipped-up collection of all the Java classes, metadata, resources needed for
some project. - ANS-1. Java SE
2. JRE
3. JDK
4. JAR
The words and symbols you use to write a computer program and the order they must go in
relative to one another. - ANS-Syntax
Defines the general behavior and characteristics (like methods and variables) of its
instantiations (objects) or the class itself.
Must be defined with upper case! - ANS-Classes
, A function that may take in an argument, which are set by expected parameters that define what
types of input values are taken in, and are called to be done by the program - ANS-Method
1. Most basic data types that contain the purest, simplest values (ex: int, bool, float)
2. The class that the instantiation belongs to (must be declared w upper case!). Objects must
have declared Class as its type.
3. Reference types (classes) that come by default in java.lang without needing to import (most
important being String, as well as wrappers) - ANS-Data Types
1. Primitive types
2. Reference types
3. Literals
1. if-else
2. for-loop
3. while-loop
4. switch break - ANS-Control structures
1. Primitives are not objects (note lower case)
2. Primitives do not have their own methods (not a static method, not a class)
3. Cannot use keyword "new" to create a primitive (cannot be instantiated, not a class)
4. Primitives have non-null default values (ex: for int, its 0)
5. When using == != <> compare operations, you are referring to their VALUES, not their
memory locations - ANS-Primitives
Class is the type of its instantiation, or object
To instantiate a class, must use "new"
1. Reference types are objects
2. Have their own methods
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