Java Reference
In-Depth Information
Java Language
Declare the package
package; , usually using the inverse of your domain name,
so a project Wonderful from the guys at would be in the
package com.pragprog.wonderful .
Import a class
import tells the Java compiler you
want to use this class. You can use a wildcard of “*”—as in inet.canary-*; —but you may get more uninvited classes than
you wanted.
Declare a class
publicclass name {} .
Declare a function
public return-type name ( argument types and names ), as in publicintmyFunction() .
Declare a block of code
Use braces, { and } .
Declare variables
type name ; as in inti; or Stack<Location>myLocations; generics need the specific
type(s) added within the angle brackets < and > .
Assign values to variables
a=10;s="Bob";x=3.1415; .
Make decisions
Decide which code to run using an if (the else {} part is optional):
if (true or false comparison) { // is true
} else { // is false
There are three ways to make a loop around a block of code:
for-each construct: for( type variable : collection ) Example: for(Playerplayer:
playerList) { block }
for loop: for(inti=0;i< limit ;i++) { block }
while loop: while( somethingIsTrue ) { block }
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