A complete argument in java. Example: System.out.print(“literal”);
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What is a class in Java? Give an example.
A template that associates and creates objects that share common properties and methods. Your public class must match the name of the file with a .java extention. Example: public class MyClass
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What is a keyword in Java? Give an example.
A word reserved by java to run code. Example: if, public, and class
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How do you make comments in java?
With two slashes (//) or with a slash and an asterisk and a backslash and an asterisk (/\*\*/)
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What is a variable?
A name associated with a memory location in the computer where you can create a value to change or vary.
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Give an example of how to combine literals and variables and have the computer print both.
System.out.print (“base: “ + base);
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Give an example on how to declare a variable only.
int a
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Give an example on how to set an initial value for a variable only.
a = 4
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Give an example of how to set a variable and give it a variable.
int a = 4
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What is an int variable?
Interger (math variable)
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What is a double variable?
Decimal (math variable)
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What is a String variable?
A variable that includes quotes and string text
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What is a boolean variable?
A variable that can only be True or False
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How do you find the answer of a decimal problem in decimals in java?
Use the primitive variable double and include decimal points in any number included.
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List all the math operators.
\+,-,\*,/,and %
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What are compound operators? List them.
Operators that use two math symbols. -- subtracts one, ++ adds one, a+=2 would set a to a + 2.
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What does / do in java?
Divides two numbers and gives an integer answer (no remainder)
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What does % do in java?
Gives only the remainder of a division problem.
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What are the types of variables?
Primitive and object or reference variables
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What are the primitive variable types in java?
int, double, string, boolean
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What is the string variable used for?
Secquences of charectes
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How many bits does a boolean variable use?
1
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What is the string concatenation operator?
\+
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What does final do in java?
stops a variable from being changed
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What is camel case?
When you uppercase the first letter
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What is an assign statement?
A statement that changes the value
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What is this operator called %?
Modulo
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What is 11 % 10 saying?
What is the remainder of how many times 10 goes into 11?
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Does the division operator drop the decimal after dividing?
Yes, no rounding
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Variable
A name associated with a memory location in the computer.
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boolean
used to declare a variable that can only have the value true or false.
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double
used to declare a variable that is a decimal number like 3.25.
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int
used to declare a variable of type integer (a whole number like -3 or 235).
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static
means that the field or method exists in the object that defines the class.
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compiler
Software that translates the Java source code into the Java class file that can be run.
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compiler or syntax error
An error or bug that is found by the compiler like a missing semicolon
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Main Method
Where execution starts in a Java program.
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Boolean
An expression that is either true or false.
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Camel Case
One way to create a variable name by appending several words together and uppercasing the first letter of each word after the first word (myScore).
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Casting a Variable
Changing the type of a variable using (type) name.
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System.out.println()
Java method that lets us print out a line of output followed by a newline to the user
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Declare a Variable
Specifying the type and name for a variable. This sets aside memory for a variable of that type and associates the name with that memory location.
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Initializing a Variable
The first time you set the value of a variable.
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String literal
Text enclosed by double quotes.
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modulo
The % operator which returns the remainder from one number divide by another.
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Operator
Common mathematical symbols such as + for addition and \* for multiplication.
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Shortcut or compound assignment operators
Operators like x++ or x+= 1 which mean x = x + 1
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assignment statements
initialize or change the value stored in a variable using the assignment operator =.
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data type
determines the size of memory reserved for a variable, for example int, double, boolean, String.
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ArithmeticException
If you divide by zero, you will get this error.
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operator precedence
Some operators are done before others, for example \*, /, % have precedence over + and -, unless parentheses are used.
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arithmetic expression
a sequence of operands and operators that describe a calculation to be performed, for example 3\*(2 + x)
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increment operator
The operator (++) that increases the value of a numerical variable by one.
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Flashcard (38)