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32 Cards in this Set
- Front
- Back
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What are alternative names for variables |
Identifier, reference, handle |
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How do you create a variable |
You must declare it which means setting a name and datatype |
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What is happening when you declare a variable? |
You are binding the name of the variable to a memory location |
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What can the first character be in a variable name |
A letter, _ , $ |
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What is the naming convention for java variables |
camelCase, camelBack which means a lower case first letter, and capitalize the first letter of every word |
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Naming convention for class names |
TitleCase, everyword has a capital first letter |
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What is the goal of declaring the datatype |
Tells the operating system how much memory to put aside. Tells the program how to interpret the data |
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How many characters from unicode and ascii are identical |
The first 256 |
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What is stored in a char |
A single character |
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What is stored in an int |
A whole number |
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What is stored in a double |
A real or floating point number |
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What is stored in a boolean |
True or False values |
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A string, or Scanner are examples of what data type |
Objects |
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What does a string store |
Holds a string of alphanumeric characters |
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What is a Scanner (data type) |
It's an object that reads the data typed in by user |
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What are the only things in java that are not objects |
Primitive datatypes |
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What is a method |
It is a block of code with a name associated to it |
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Why are they called primitives |
They don't have any methods associated to them |
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Can integer numbers be easilyconverted and represented in binairy form |
Yes |
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Can floats be easily converted and represented in binairy form |
No, the computer has to store the number as two seperate parts called mantissa and exponent |
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What is the naming convention for constants |
UPPER_CASE_LETTERS with underscores seperatimg every word |
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When can you assign a value to a declared constant |
When you declare it or anytime after declaring it |
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What is a data literal |
It is an actual data value that appears in the program |
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If you divide an integer by anoter integer what datatype will you get |
An integer |
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What happens when you divide an integer literal with another integer literal |
Java will truncate any decimal numbers |
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If you divide a double by an integer what is the datatype that will be returned |
Double |
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What is a datatype |
Its hoe a computer language represents the various types of numbers and text characters we use in our real world |
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What are the only things in java that are not objects |
Primitive data types |
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myValue = 3 + 6. What are the operators |
The + |
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myValue = 3 + 6 What are the operands |
3 and 6 |
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What is the % used for |
Returning the remainder from a division operation |
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What is modulus useful for |
It's useful to determine if a value is odd or even. By doing: myValue % 2 == 1 |
