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CS2 Midterm - Exam with 100% correct answers 2024/2025 LATEST UPDATE 100% VERIFIED
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CS2 Midterm - Exam with 100% correct answers 2024/2025 LATEST UPDATE 100% VERIFIED
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CS2 Midterm"Imports" java libraries to supply useful methods, data structures, etc
Go at the top of code, outside of class declaration - ANS-Import statements
1. Constant (best) ex: popping stack, looking at an index in an array
2. Log2N (worse, but better than linear) ex: binary search
3. Linear N (worse, but better than quadratic) ex: traversing the entirety of list
4. Quadratic N^2 (worst) ex: traversing a list within a list, double for-loop - ANS-Kinds of Big O
1. HashMap: A map that does hashing stuff. The keys are not sorted, and will seem to be in an
arbitrary, random order.
2. LinkedHashMap: Keys are returned in the order in which they were added to the Map
3. TreeMap: Keys sorted in "natural order," by having keys implement Comparable, or by
supplying a Comparator - ANS-3 types of maps
1. if-else
2. for-loop
3. while-loop
4. switch break - ANS-Control structures
1. 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
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
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. No modifier (default): Visible to the package
2. Private: Visible only to the class and not to subclasses nor other packages
.3. Protected: Visible to class and to subclasses, and subclasses in OTHER packages (must be
imported)
4. Public: Visible to all packages (must be imported), classes, subclasses, etc. - ANS-Access
level modifiers
1. Open addressing uses less memory (no lists within an array, just use the space already
allocated)
2. Separate chaining, you'll never run out of memory allocated for the original array... but you
take up more memory
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