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Java: Class Design Examples

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Tareq Hasan
Tareq Hasan

Sub: Java Topic: Class Design Examples Slide number: 3 Presented by: Mahbubul Islam (MMI) Lecturer, Dept. of CSE University of Rajshahi

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Class Design Examples
Problem Solving ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Problem Solving Strategy
The Class Design Steps ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Example 1: Designing a Car Class ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Class Definition: Step by Step ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Class Definition: Step by Step ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Class Definition: Step by Step ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Complete Program ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Complete Program (cont .....) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Two Car Objects ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Example 2: Designing a class “CheckingAccount” ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Example 2: Designing a class “CheckingAccount” ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Class Definition ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
CheckingAccount: More Requirements Analysis ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Complete Class ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Using a CheckingAccount Object ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Encapsulation and Visibility Modifiers
What is “Encapsulation” ,[object Object],[object Object],[object Object],[object Object],[object Object]
Why is “Encapsulation” ,[object Object],[object Object]
The “private” visibility modifier ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
main can’t access private members ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Access Methods ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
CheckingAccount Class with Access Methods ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
main uses access methods to access private members ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],class CheckingAccountTester { public static void main( String[] args ) { CheckingAccount bobsAccount = new CheckingAccount("999","Bob", 100); System.out.println(bobsAccount.balance); bobsAccount.balance = bobsAccount.balance + 2000; bobsAccount.balance = bobsAccount.balance -1500; System.out.println( bobsAccount.balance ); } }
Private Methods ,[object Object],[object Object],[object Object],[object Object]
Private Methods Example: incrementUse( ) ,[object Object],[object Object],[object Object],[object Object]
CheckingAccount class with incrementUse( ) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
main can’t use private method ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
display( ) Method ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
The public Visibility Modifier ,[object Object],[object Object],[object Object]
The public Visibility Modifier ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Default Visibility ,[object Object],[object Object],[object Object],[object Object]
Parameters, Local Variables, Overloading
Parameters and Local Variables ,[object Object],[object Object],[object Object]
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],What is a Parameter
What is the use of a Parameter ,[object Object],[object Object],class CheckingAccountTester { public static void main(String[] args) { CheckingAccount bobsAccount= new CheckingAccount("999", "Bob", 100 ); bobsAccount.processDeposit( 200 ); } }
Formal and Actual Parameters ,[object Object],[object Object],[object Object],[object Object]
Scope of a Parameter ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Local Variables ,[object Object],[object Object],class CheckingAccount { private int balance; void processCheck(int amount) { int charge; // scope of charge starts here ........................ // scope of charge ends here } }
Method Overloading ,[object Object],[object Object]
Method Overloading class CheckingAccount { private int balance; . . . . void processDeposit( int amount ) { balance = balance + amount ; } void processDeposit( int amount, int serviceCharge ) { balance = balance + amount - serviceCharge; } } class CheckingAccountTester { public static void main( String[] args ) { CheckingAccount bobsAccount = new CheckingAccount( "999", "Bob", 100 ); bobsAccount.processDeposit( 200 ); // call to first bobsAccount.processDeposit( 200, 25 ); // call to second } }
Method Signature ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Call by Value & Primitive Parameters ,[object Object],[object Object],class SimpleClass { public void work( int x ) { x = 100; // local change to the formal parameter } } class SimpleTester { public static void main ( String[] args ) { int var = 7; SimpleClass simple = new SimpleClass(); System.out.println("First value of the local var: " + var ); simple.work( var ); System.out.println("Second value of the local var: " + var ); } } Output First value of the local var: 7 Second value of the local var: 7
Object Parameters ,[object Object],[object Object],[object Object],[object Object]
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Mutable Object Parameters: MyPoint x = 3; y = 5 x = 6; y = 10
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Immutable Object Parameters: String First value of message: Welcome Second value of message: Welcome

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Java: Class Design Examples

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  • 42. Method Overloading class CheckingAccount { private int balance; . . . . void processDeposit( int amount ) { balance = balance + amount ; } void processDeposit( int amount, int serviceCharge ) { balance = balance + amount - serviceCharge; } } class CheckingAccountTester { public static void main( String[] args ) { CheckingAccount bobsAccount = new CheckingAccount( "999", "Bob", 100 ); bobsAccount.processDeposit( 200 ); // call to first bobsAccount.processDeposit( 200, 25 ); // call to second } }
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