Java Reference
In-Depth Information
Create a new object
Foo thing = new Foo(); , where Foo is the name of the class and thing is the
variable to be assigned to the new object.
Call a function
Use parentheses, as in getServer() , which returns a Server object for a plugin.
Java Visibility Modifiers
Don't let me—or anyone else—change this value once I set it.
Keep this data or function around outside any given object.
You can mix and match final and static as needed.
Anyone else can see and use this function or data.
This class and other classes in this package can see and use this function
or data.
Only this class can see and use this function or data, not subclasses or
other classes in the same package.
You use either public or private per declaration, so this code would create a
publicly visible, unchangeable constant outside of any object:
public static final int pi = 3.1415;
Java Data-Type Conversions
int to double
Assign it: intnow=72;doubletemperature=now; .
double to int
Cast it; the fractional part is discarded: doublewhen=15.375;intday=(int)when; .
String to int
Use parseInt : intfoo=Integer.parseInt("365"); .
String to double
Use parseDouble : doublefoo=Double.parseDouble("3.1415"); .
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