Mrs Howe's Cookbook for Java

IMPORT CALLS

    import javax.swing.JOptionPane; 

    import java.awt.Graphics;

    import javax.swing.JApplet;

APPLICATION FRAMEWORK

public class ClassName{

public static void main(String[] args){
YOURCODEHERE

System.exit(0);

}

}

APPLET FRAMEWORK

public class WelcomeApplet extends JApplet {

code here

}

MORE APPLET STUFF

public void paint ( Graphics yourVariableName ) {

 super.paint( yourVariableName  );

yourVariableName .drawString ( "YOURWORDS", YOURX, YOURY );

}

SYSTEM COMMANDS

System.out.print("WHAT YOU WANT TO SAY");
System.out.print(variableName);

System.exit(0);

~MESSAGE BOX/ INPUT BOX

JOptionPane.showMessageDialog(null,"WHAT YOU WANT TO SAY "+ variableName);

    stringVariableName = JOptionPane.showInputDialog("YOUR PROMPT");

ICONS FOR POP-UP BOXES

JOptionPane.showMessageDialog(null,"WHAT YOU WANT TO SAY ","YOUR TITLE BAR", JOptionPane.PLAIN_MESSAGE);

JOptionPane.showMessageDialog(null,"WHAT YOU WANT TO SAY ","YOUR TITLE BAR", JOptionPane.INFORMATION_MESSAGE);

JOptionPane.showMessageDialog(null,"WHAT YOU WANT TO SAY ","YOUR TITLE BAR", JOptionPane.WARNING_MESSAGE);

JOptionPane.showMessageDialog(null,"WHAT YOU WANT TO SAY ","YOUR TITLE BAR", JOptionPane.QUESTION_MESSAGE);

   CONTROL COMMANDS

for

for (initial conditions; conditions; increment)

{

}

while

while (condition)

{

}

do while

do{

}while(condition);

switch

switch(variableName) {

case 1:

commands

break;

case 2

commands

break

}

GUI STUFF

DATA TYPES

(primitive)

    int

    double

  short, long, byte, char, and float

STRING 

(from data.lang)

No need to import this library ( automatic.)

String  stringVariableName;

 Strings can be converted to double or int by  a "parse" command.  For example:

doubleVariableName = Double.parseDouble(stringVariableName); 

 integerVariableName = Integer.parseInt(stringVariableName); 

MATH CLASS

Math.abs( something)

Math.ceil( something)

Math.floor(something)

Math.round(something)

Math.sin(something)

Math.cos(something)

Math.tan(something)

Math.exp(something)

Math.log(something)

Math.max(something,something)

Math.min(something,something)

Math.sqrt(something)

Math.toDegrees(something)

Math.toRadians(something)

Math.PI

Math.E

Math.random( )

Math.pow( somefloat, somefloat)

variable type.MAX_VALUE

variable type.MIN_VALUE

"REGULAR" MATH

+ - * % /

equal (assignment)       =

equal (comparison)       ==

modulus          %

not equal          !=

ESCAPE CODE SEQUENCES

new line       \n

tab               \t

backslash      \\

return          \r

quotes         \"

COMMENTS

//   

/* multiple line

 comment */

COLORS (predefined by Color class)

Color.white

Color.black

Color.gray

Color.lightGray

Color.darkGray

Color.blue

Color.green

Color.cyan

Color.red

Color.magneta

Color.pink

Color.orange

Color.yellow

or  make your own color using integers (0-255 for r,g,b)

see Maria's book page 379 for more information

_____.setColor(new Color( r,g,b);

PAINT COMMANDS

import java.awt.Graphics

GraphicsObject.drawRect(x,y,width,height);

GraphicsObject.drawString("message");

GraphicsObject.drawRect(x,y,width,height);

GraphicsObject.fillRect(x,y,width,height);

GraphicsObject.drawRoundRect(x,y,width,height,arcwidth,archeight);

GraphicsObject.drawOval(x,y,width,height);

GraphicsObject.fillOval(x,y,width,height);

GraphicsObject.setColor(color);

      All classes inherit from Object

Object has toString, equals and hashCode methods     

MORE STRING STUFF

You don't have to "new" all strings

String s="AOK";

is equivalent to String s = new String("AOK");

Methods

.length()

substring(int startIndex)

.substring(int startIndex, int endIndex)

"first one you want, first one you don't want" count from 0

.equals( )

.indexOf( String)

.intValue()

.compareTo()