Java Programming Practice in Class Buttons Icons and Clicks

8/17/2019 Java Programming Practice in Class Buttons Icons and Clicks

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Copyright © 2012, Oracle. All rights reserved.

Getting Started with Buttons Icons and

Clicks


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Oracle Academy Java Fundamentals Institute: Day

!cli"se Activity

Let us create a small project on user interaction in Javausing clipse.


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Copyright © 2012, Oracle. All rights reserved. !


!cli"se Activity

"e #ill create a ne# "or$space

%ile, itch "or$space, Other,

'ro#se (o )estination %older

nter %older *ame, Clic$ O+


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!cli"se Activity

"e #ill create a ne# project named ui-demo

%ile, *e#, Java roject

nter roject *ame as ui-demo

Clic$ %inish


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Copyright © 2012, Oracle. All rights reserved. /


!cli"se Activity

"e #ill create a ne# pac$age

%ile, *e#, ac$age

&elect &ource %older as ui-demo

nter ac$age name as com.eample.ui-demo

Clic$ %inish


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Getting Started with Green#oot

!cli"se ID!

(he clipse ) loo$s li$e the 3ollo#ing


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!cli"se Activity

Add a main class #ith de3ault main method

&elect created pac$age com.eample.ui-demo

&elect %ile, *e#, Class

nter name as 5ame6ain

&elect pu7lic static void main8&tring9: args


8/21Copyright © 2012, Oracle. All rights reserved. ;


!cli"se Activity

Create a new class to extend JFrame (MainFrame)

Select created package com.example.ui_demo

Select File, New, Class

Enter name as MainFrame

Edit class to ollowing

public class MainFrame extends JFrame{

!e also re"uire to #dd t$e import statement

import javax.swing.JFrame;


9/21Copyright © 2012, Oracle. All rights reserved. <


!cli"se Activity

Add constructor #ith call to super and title as parameter

public 6ain%rame8=>

super 8?5ame anel@=

B


10/21Copyright © 2012, Oracle. All rights reserved. 10


!cli"se Activity

pdate constructor to set the Layout manager #e #ish to

use.

public MainFrame(){

super("Game panel");

setLayout8new GridLayout(2,2));

DDdisplay 3rame

pac$8= setLocationEelative(o8null); //centre

setFisi7le8true);

B

"e also reGuire to Add another import statement

import jaa!awt!GridLayout;




!cli"se Activity

Add instance o3 6ain%rame to main, and update

constructor to instantiate.

public class 5ame6ain >

public static 6ain%rame gFrame

public static oid main8&tring9: args= >DD create an instance o3 6ain%rame

gFrameH new 6ain%rame8=

B

B




!cli"se Activity

Copy mage 3older to same 3older as ?srcI 3older in project

l d d l i


13/21Copyright © 2012, Oracle. All rights reserved. 1!


!cli"se Activity

Create a ne# class to etend J'utton 8%ruit=, and add event listener

public class %ruit etends J'utton implements ActionListener>

"e also reGuire to Add other import statements and

unimplemented methods to remove errors

import java.a#t.event.Actionvent

import java.a#t.event.ActionListener

import java.s#ing.magecon

import java.s#ing.J'utton

O l A d J F d l I i D




!cli"se Activity

add class level attri7utes to store images and a 7oolean to

determine i3 a card has 7een turned

priate magecon 3rontmg, 7ac$mg

priate boolean 3acep

O l A d J F d t l I tit t D


15/21Copyright © 2012, Oracle. All rights reserved. 1/


!cli"se Activity

add a constructor to accept 3ront image and i3 turned. Add

ActionListener method to deal #ith mouse clic$s.

public %ruit8&tring 3ruit*ame, boolean visi7le=>

3rontmg H new magecon83ruit*ame=

7ac$mgH new magecon8@magesDDcard-7ac$.jpg@=

3acepHvisi7le

i# 83acep=>

setcon83rontmg=B

else>

setcon87ac$mg=

B

addActionListener8t$is= DDset to react to mouse clic$s

B





!cli"se Activity

Create an instance o3 a 7utton in the 6ain%rame K 1st

create class level declaration

priate %ruit apple

then instantiate in constructor 7e3ore the code to dra# the 3rame

apple H new %[email protected]@, #alse=

add8apple=

Eun to test, then change 3alse to true and run again. Eeset as 3alse.





!cli"se Activity

Add ! more instances 3or 'ananas, cherries and grapes,

set visi7le parameter in constructor 3or cherries and grapesto ?trueI

priate Fruit apple, c$erries, %rapes, banana;

7anana H new %[email protected]@, #alse=

add87anana=cherries H new %[email protected]@, true=

add8cherries=

grapes H new %[email protected]@, true=

add8grapes=

Eun and test again.



18/21Copyright © 2012, Oracle. All rights reserved. 1;


!cli"se Activity

*et, #e can add some code to the overridden method

auto created earlier to deal #ith the mouse clic$ in the %ruitClass

public oid actioner3ormed8Actionvent e= >

&ystem.out .println8@mouse clic$ detected@=

i# 83acep=>

setcon83rontmg=

3acepHtrue

B

else>

setcon87ac$mg=

3acepH#alse

B

B

Eun and test again.

Oracle Academy Java Fundamentals Institute Day


19/21Copyright © 2012, Oracle. All rights reserved. 1<


!cli"se Activity

%inally M create a #ay o3 passing in3ormation 3rom the %ruit

class to the 6ain%rame class to deal #ith situation

Chec$ing n the 6ain%rame class create a class level attri7ute to

$eep trac$ o3 num7er o3 cards 3ace up

priate int cards(urned

in the 3inal line o3 the constructor, set it to 2

cards(urnedH2





!cli"se Activity

Create a ne# method in the 6ain%rame class to update

num7er o3 cards 3ace up

public oid update8int change=>

cards(urnedNHchange

&ystem.out .println8@Cards 3ace up @Ncards(urned=

B

n the %ruit class, add a call to the update method #ith the correct

value in the Actioner3ormed method

5ame6ain.gFrame.update81=



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!cli"se Activity

n the %ruit class, add a call to the update method #ith the correct

value in the Actioner3ormed method

i# 83acep=>

setcon83rontmg=

3acepHtrue

5ame6ain.gFrame.update81=

Belse>

setcon87ac$mg=

3acepH#alse

5ame6ain.gFrame.update8K1=

B

Java Programming Practice in Class Buttons Icons and Clicks

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