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compiler
translates our English into 0s and 1s for the processor to understand
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source code
Human written code
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byte code
a class file, which contains 0s and 1s also called machine code
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case-sensitive language
Capital letters and lowercase letters are interpreted differently
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public class
The start of every Java program and containsthe code: public class {}
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main method
public static void main(String[ ] args) {}
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Code to print to system?
System.out.println(“text”);
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memory
What a computer uses to store information it needs
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variable
is placeholder for data in a computer program
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identifier
The name of a variable
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keyword/reserved word
Words that are set aside for use in the Java language
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int
Whole Numbers (5, 10, 100,-50)
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double
Decimal Numbers (5.5,10.0583)
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char
A single Character (‘A’,‘b’, ‘&’)
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initialization of the variable
Giving a variable an initial value
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How does Java compute concerning the equal sign?
The right side of the equal sign is computed first.
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5 % 2 calculates what?
The remainder so the answer would be 1.
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Syntax error
grammatical problem with the source code.
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Runtime error
when your source code compiles, but when you execute it an error occurs
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Logic error
is when the code has correct syntax, causes no errors during execution, but it produces undesired results
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Comments
are sections of our source code that are ignored by the compiler
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Single Line Comments
// comment
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Area Comments
/* comment */
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All _____ files start with public class and the name of the class?
Java
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The ______ tells Java where your program should begin execution?
main method
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promotion
When we divide two numbers where one is an int and the other is a double, the integer value is temporarily changed into a double for the operation.
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casting
- When we want to force Java to temporarily change a value’s type, we can cast the type into something else.
- (double) 5 // Casts 5 into 5.0
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constant
is a variable whose value can not be changed. Any attempt to do so will cause a syntax error.
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how do we decade a variable as a constant?
- we use the keyword final before the declaration
- final double PI = 3.14;
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methods
is a group of code that performs a single task
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How does a simple method begin?
public static void ( ) {}
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calling or invoking a method means what?
New methods you write must be told to run from the main method which is invoking or calling the method.
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parameters
When a method needs information to complete its task, it accepts that information through the use of parameters
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give an example of a parameter
public static void method(int x)
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argument
The value you provide in the parenthesis gets stored into the parameter in the method. The value you provide is known as an argument
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promotion with integers concerning doubles
Java will “promote” an integer value into a double value if an integer is given where a double is expected
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local variable
Any variable declared inside a method only exists inside that method
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A variable declared inside
a method is known as one that is ______ to
that method ?
local
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class variables and instance variables
kinds of variables that may be used across every method
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The Basic Method
public static void method_name(){}
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Methods can send back a value to the location in which the method was called, this is called what?
returning a value
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We write void in the method what does it mean?
void is written when the method does not return a value
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If we want a method to return a value, we replace the word void with the data type that will be returned. What is this called?
This portion of the method signature is called the method’s return type
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The Keyword return
To return a value, we use the keyword return, followed by the value to be returned.
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tags
contained in a Javadoc and begins with @ and followed by author or version
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How would you give someone information about your code without giving them source code?
javadoc
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A example method signature is what?
public static <return_type> <method_name>(params) {….
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public static <return_type> <method_name>(params) {} , define the bold terms
- Where return_type: is the type of value that the method returns. If nothing is returned, we use the keyword void
- method_name: is the name of your method
- params: are all the parameters the method uses to accept value
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