شرح مقرر البرمجة 2 "لغة جافا" - مادة النصفي كلية التكنولوجيا والعلوم التطبيقية جامعة القدس المفتوحة

1. 1

2. INTERFACE CONCEPT




3. ...
:





4. ...



5. DEFINING AN INTERFACE
classinterface
interface Identifier}
....Body of Interface


6. ...
The Interface Declaration


7. 1
public interface MyInterface {
public static final smt=10;
public static final pie=3.14159;
public static final String="The First MyInterface";
public abstract boolean isBlue(Color);
public abstract boolean isBlue(String);
public abstract StringBuffer ForName(String);
}

8. :
public interface SomeInterface extends InterfaceA,
InterfaceB, InterfaceC
{
public static final smt=10;
public static final pie=3.14159;
public static final string="The First MyInterface";
public abstract boolean isBlue(Color);
}

9. THE INTERFACE BODY


Access modifiers
public, static and final.
public and abstract

10. IMPLEMENTING (USING) AN
INTERFACE

implements

class ClassName [extends AnClassName]
implements InterfaceName
]InterfaceName_ 1 , InterfaceName_2, …….n[
} ...Body Of Class
}

11. 



12. ...






13. PACKAGE MEMBERS

java
netlangioappletawt util
image

14. CREATING A PACKAGE
package


package Identifier;


15. package mjk.MyMath;
public class CompNum
{ // ......
{
CompNummjk.MyMath
unnamed package

16. ...


java , java.lang.

17. USING PACKAGE MEMBERS






18. 1
package mjk.MyMath;
public class CompNum
{ private double m_dR;
private double m_dI;
public CompNum(double dR, double dI)
{m_dR = dR;
m_dI = dI;
}
public CompNum(double dR)
{ this ( dR, 0.0);
}
public CompNum Add(CompNum n )
{ return new CompNum(m_dR + n.m_dR , m_dI + n.m_dI );
}
...// other operators follow
}

19. ...public class Check
{ public static void main(String[] s)
{ mjk.MyMath.CompNum x1 = new mjk. MyMath.
CompNum
(4.0, 2.0);
mjk.MyMath.CompNum x2 = new mjk. MyMath.
CompNum
(4.0, 0.0);
mjk.MyMath.CompNum xsum = x1.Add( x2 );
} }

20. 2
import mjk.MyMath.CompNum;
public class Check
{ public static void main(String[] s)
{ CompNum x1 = new CompNum(4.0, 2.0);
CompNum x2 = new CompNum(4.0, 0.0);
CompNum xsum = x1.Add( x2 );
}
}

21. 3

import mjk.MyMath.*;
public class Check
{ public static void main(String[] s)
{ CompNum x1 = new CompNum(4.0, 2.0);
CompNum x2 = new CompNum(4.0, 0.0);
CompNum xsum = x1.Add( x2 );
}}

22. import

java.lang


23. java.lang
java.appletWWW
java.awtAbstract Window Toolkit
java.io
java.net
java.util