6445695
Description
Flashcards by Anika Patry, updated more than 1 year ago
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Created by Anika Patry
over 8 years ago
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| Question | Answer |
| Procedural | tells the computer how to preform task in a series |
| Object oriented | driven by an even or user emphasis on code reuse by creating objects (Like Java) |
| who was java invented by? | james gosling sun micro-systems |
| what are the types of programming error, and how many are there? | 1)syntax errors; 2)semantic errors 3)Run Time Errors: |
| what is an algorithm? | an algorithm is a piece of rough draft/ plan of the code you are going to write. |
| what are the components of an algorithm? how many components are there? | there are 7 define the problem, inputs, outputs, assumptions, hand cals, general, detailed ver. |
| what are the two types of algorithms? | pseudo code and flow charts |
| name the primitive data types | byte, int, short, long, double, float, char, boolean |
| what is the size of a byte data type? | 8 bit storage 1- 127/128 |
| what is the size of a long data type? | 64 bit storage hold numbers 2^63 and 2^63 -1 |
| what is the size of a short data type? | 16 bit storage hold number 1/0 - 32768 and 32767 |
| what is the size of a int type? | 32bit storage hold numbers 1 - 2^31 and 2^31 - 1 |
| what is the size of a float type? | 32 bits values between -3.4E38 to 3.4E38(6 to 7 digits of precision) |
| what is the size of a double type? | 64 bits values between -1.7E308 to 1.7E308(14 to 15 digits of precision) |
| what is the size of a char type? | 16bits holds one character |
| what is the size of a boolean type? | 16bits true or false values |
| what is a literal? | They are constant values that can be assigned to a variable or used in an equation |
| what is implicit cast? | automatic promotion from a lower data type to a higher data type. The compiler does the work, and nothing is required from the programmer. |
| what is an explicit cast? | casting from a higher data type to a lower data type, explicit casting with most likely result in the loss of data. Situations where an explicit cast is required will be a syntax error unless the programmer does the explicit cast. |
| what is a named constant? | This is like a variable except the value stays constant. Constants give literal values that have a specific meaning a name so that we can use it in the program. |
| how do you declare a named constant? | Directly after the public class public static final ex/ public static final int( or var type) NUMB=30; |
| what are the two types of system outputs that we can use? | 1) Println - displays to the user and moves to the next line on the display 2) Print - displays information and stays on the same line |
| how do we receive input from a user? | we can prompt for input by using the scanner function. |
| why dont we use system.in? | it is very difficult to work with |
| what do we use instead of system.in? | we use the scanner packet |
| how can we use the scanner function in the java code? | we will have to import it : import java.util.Scanner; we will also have to rename it, Scanner input(new scanner name) = new Scanner(system.in); |
| how can we different data types from scanner? | scannername.next[var-type](); |
| what type of data is a string? | class data type |
| how do you declare a string variable? | String "this is the string variable" |
| what method tells you if a string is empty? | isEmpty(); |
| what method extracts a part, or parts of a string? | Substring( beginIndex) substring(beginIndex, endIndex) |
| how would you create a new string in all caps? how about all lowercase? | toUpperCase() ; toLOWERCase() ; |
| how can you check if a string equals another | use the equals method |
| what is the order of operations that java follows? | () ++ -- ! * / % + - <, > , >= , <= == != && || |
| what is a decision statement? | in java it is if's, and else if's |
| what is the proper syntax of an if statement? | if ( Boolean expression ) { then statement(s) } |
| can you have an if statement in another if statement? | yes. |
| if you have an if statement with in another what is it called? | a nested if statement |
| how would you scan a char data type with the next function? | you cannot use the next function so you will have to use the following: scanner.next.charAt(0); |
| what is a switch statement? | a switch statement is similar to an else if statement. It is also used for mutually exclusive situations |
| what is the syntax for a switch statement? | switch(controlling expression) case label: statement break; |
| how do you check the validity of inputs with a switch statement? | using the default (case |
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