in programing
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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Test Plans should test | ever condition possible. valid or invalid.
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Every object created with new has | Its own copy of the attributes stored in memory
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char size | 2 bytes or 16 bits
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int size | 4 bytes or 32 bits
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how to compile JavaMain.java | javac JavaMain.java
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A java file need to have what to compile | public static void main(String[] argv) {
}
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A programmer requires knowledge of the language also called | syntax
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double size | 8 bytes or 64bits
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float size | 4 bytes or 32 bits(same as int)
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long size | 8 bytes or 64bits(same as double)
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to define a number as a float you need to | (float)9.9 or 9.9f
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strings and char require | single or double qoutes
'A' "A"
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short | 2 bytes or 16 bits(same as char)
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variables can have what but can't start with it | a number
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what indicates input from a device in Java | System.in
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importing Scanner syntax | import java.util.Scanner;
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creating scanner syntax | Scanner input = new Scanner(System.in);
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getting data from user syntax | x=input.next();
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Escape Sequence for newlin | \n
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Escape Sequence for tab | \t
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Escape Sequence for Ring Bell | \r
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Escape Sequence for print special character | \\ \" \'
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Syntax error | error that stops the program from comiling
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Logic error | program runs but returns strange results
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Run-time error | program stops because of not possible answers such as divide by zero
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Given declaration Name name1; a call to displayName method would be | name1.displayName();
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Members declared as private can be accessed | buy the class they are created in
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when is memory for a class allocated | when a reference to the object name is declared
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Every Java application has at least one | public class
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Method headers must contain | name, return type, parentheses ()
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how to round 99.95 with print statement | System.out.printf("%1.1f", 99.95);
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printf statements for floats and doubles | %f %e
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printf for int | %d
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printf for char | %c
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%e does what | prints scientific notation
e+00
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Methods are | code that performs actions and returns data
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Method Modifier | public, private static
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Method return types | void, Boolean, int, double...
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Can you increase String size automatically | Yes because all strings are reference variables
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String sName.CompareTo("Thing") will return | a 0 if true and a 1 if false
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String name = "Bob Jone"; char letter =name.charAt(2); returns | b
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When is memory for an object alocated | when the object is instantiated Ex: Class objectname = new Class();
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default constructors take how many variables | none
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Three ways to assign values to Strings | name="thing"'; name = new String("thing"); name=input.nextLine();
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Review the information in the table. When you are ready to quiz yourself you can hide individual columns or the entire table. Then you can click on the empty cells to reveal the answer. Try to recall what will be displayed before clicking the empty cell.
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If you know all the data on any row, you can temporarily remove it by tapping the trash can to the right of the row.
To hide a column, click on the column name.
To hide the entire table, click on the "Hide All" button.
You may also shuffle the rows of the table by clicking on the "Shuffle" button.
Or sort by any of the columns using the down arrow next to any column heading.
If you know all the data on any row, you can temporarily remove it by tapping the trash can to the right of the row.
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