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CSE 2221 Midterm 1 Exam/113 Answered Questions
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CSE 2221 Midterm 1 Exam/113 Answered Questions
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CSE 2221 Midterm 1 Exam/113Answered Questions
What is Java? - - programming language developed by Sun
Microsystems/Oracle
- Java vs C/C++ - - - similar syntax, control, data structures
- imperative, object-oriented
- Imperative vs Declarative - - imperative: has instructions
declarative: mathematical
- Java: then vs now - - - originally designed for interactive television, found
its initial success in Internet applications
- now viewed as a general-purpose programming language
- Java Compilation - - 1) The Java compiler checks the source code of the
program in a .java file
2) If there are no compile-time errors, it generates a bytecode for the for the
program and saves it in a .class file
- JVM - - the program is executed by interpreting the bytecode that is
loaded
java and the JVM are a part of the JRE for your computer and OS
- Java End-to-End - - MyProg.java -> MtProg.class -> JVM / hardware/OS
- Significance of JVM - - - portability: "write once, run anywhere", JVM is
ubiquitous
- universality: program source code need not be in Java
- performace: extra layer comes at (surprisingly small) penalty in
performance
- javac - - a batch style compiler
, - command line arguments - - String[] args means that the main expects
the JVM to hand it an array of strings (called command-line arguments) when
it is executed
- Package - - i.e components w/ OSU CSE components,,
- Character-string constants/String literals - - "hello!"
- type - - the name of the set of all possible values that a variable might
have
ex. a set of strings, ints, etc
- Program vs. Mathematical Variable - - program variable: can change
mathematical variable: fixed value
- Examples of Program Type and Mathematical Models - - - String vs. string
of character
- boolean vs. boolean
- double vs. real
- Built-In/Primitive Data Types - - built-in: String
primitive: boolean, char, int, double
- camel case - - - the standard java convention for naming variables
- ex. myLuckyNumber
- literal - - - a data value appearing literally in a program
- int j = 14, char win = 'w'
- octoliteral stuff - - -
- escaped special character: single quote - - "I\'m"
- non-printing character: tab - - '\t'
- unicode character - - small greek pi
- octal integer (base-8)
hexadecimal integer (base-16) - - 035, oxla
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