Advanced Programming in Java

1. Advanced Programming in Java SadeghAliakbary Sharif University of Technology Fall 2010

2. Agenda • Type Checking • Type Casting • Type Conversion • toString() method • equals() method Sharif University of Technology

3. Type Safety • The Java language is designed to enforce type safety • Accessing memory in inappropriate ways is banned • Every piece of memory is part of some Java object • Each object has some class • Because of • No Pointer • Strong Type Checking Sharif University of Technology

4. Java Type Checking • Java has a strong type checking mechanism Sharif University of Technology

5. Primitive Types Sharif University of Technology

6. Type Checking Special Cases • Reference-type to primitive type and vise versa Sharif University of Technology

7. Type Checking in Method Calls Sharif University of Technology

8. Type Casting • You can change the type by type casting • Casting in reference types and other objects is not so simple • See it later Sharif University of Technology

9. Type Conversion • Sometimes we want to convert an object to another type • Type casting is not the solution here • We should write some methods to convert the types Sharif University of Technology

10. Type Conversion (2) Sharif University of Technology

11. toString • toString() is a special method • You can write it for every class Sharif University of Technology

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13. Checking equality in java Sharif University of Technology

14. equals method Sharif University of Technology

15. Parameter Passing • Call by value • Call by reference • Java style : Call by passing value of references! • Let’s see! Sharif University of Technology

16. Quiz! • Write a java class for representing … Sharif University of Technology

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