Java Programming Symbols
Method
A snippet of code that performs some specific task for the programmer.
;
A statement ends here.
Public
A Java keyword which declares a member's access as visible to all other classes. This means that any other class can access the field or method.
Out
The class for output to the keyboard.
Void
The following method doesn't return a value.
{
The java block of code begins here.
Float
decimal number; used to declare a variable that can hold a 32-bit single precision
break
exit from a control structure, particularly a switch statement
prints just as println, but without a carriage return
a=b
value of a should be assigned to variable b
>=
Boolean for greater than or equal to
!=
Boolean for inequality
<
Boolean for less than
<=
Boolean for less than or equal to
- -
Decrements the value held in variable by one
(
An expression or parameter list begins here.
)
An expression or parameter list ends here.
==
Boolean for equality
>
Boolean for greater than
Close
Closes a file stream cleanly
String
Consists of a sequence of characteristics
New
Construct a new object of the following type and parameters
boolean
Defines a variable for the values "true" or "false" only
Class
Defines the implementation of a particular kind of object; defines instance of methods
++
Increments the value held in a variable by one
Math
Like system, a class that contains an assortment of methods.
&&
Logical operator for and
Println
Prints a string, ending in a carriage return.
a%b
Return the remainder of a divided by b
a/b
Return the value of a divided by b
a-b
Return the value of a minus b
" "
This is a string literal.
import
Used at the beginning of a source file to specify classes or entire Java packages to be referred to later without including their package names in the reference
Long
Used to declare a long interger
Int
Used to declare an interger
case
Used with a switch statement; A statement in the switch block can be labeled with one or more labels; The switch statement evaluates its expression, then executes all statements that follow the matching label;
Main
Where Java starts running the program.
Static
a java keyword denotes that a member variable, or method, can be accessed without requiring an instantiation of the class to which it belongs; it means that you can call a method, even if you've never created the object to which it belongs
if
beginning of a conditional statement.
switch
beginning of an advanced conditional statement; Used in conjunction with case and default to evaluates a variable, matches its value to a specific case, and executes the block of statements associated with that case
else
beginning of an alternative to the conditional.
true
boolean value for not false
false
boolean value for not true
b+a
the concatenation of string a onto string b; example: "high " + " school"
System
A class containing useful subclasses and methods; part of a standard output function used in java. where the term specifies the package name, "out" specifies the class name and "print" is a function in that class.
a+b
Return the value of a plus b
a*b
Return to value of a times b
Random
Returns a random number between 0 and 1.
nextDouble
Returns the next decimal entered from an input stream
nextInt
Returns the next interger entered from an input stream
nextLine
Returns the next line entered from an input stream.
Next
Returns the next space-delimited token from an input stream.
}
The java block of code block ends here.
Double
decimal number; used to declare a variable that can hold a 64-bit double precision
for
keyword to keyword is used to create a loop, which specifies a variable initialization, a boolean expression, and an incrementation.
While
keyword used to create a loop, which tests a boolean expression and executes the block of statements associated with the loop if the expression evaluates to true; this continues until the expression evaluates to false
Scanner
like system, a class that contains an assortment of methods; this class is a class in java.util, which allows the user to read values of various types
!
logical operator for not
l l
logical operator for or
