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![Constructors (2)
• How to construct objects?
• Usually, we have many classes in a projects. So the student class
will be created in other classes.
• To construct objects from student class:
public class TestStudent {
public static void main(String[] args){
Student stu;
//To construct an object
stu = new Student();
System.out.println(stu.toString());
}
}](https://image.slidesharecdn.com/chapter6-ooprevision-151019085622-lva1-app6892/85/Objected-Oriented-Programming-with-Java-7-320.jpg)
![Access Object’s Data and Methods
• To access method:
public class TestStudent {
public static void main(String[] args){
Student stu;
//To construct an object
stu = new Student(“123”,”Veasna”);
System.out.println(stu.toString());
}
}
• To access data:
• Usually, We don’t access the data. If you like, you can do like :
stu.id = 123 in case id is not private.](https://image.slidesharecdn.com/chapter6-ooprevision-151019085622-lva1-app6892/85/Objected-Oriented-Programming-with-Java-8-320.jpg)
![Constructors (2)
• How to construct objects?
• Usually, we have many classes in a projects. So the student class
will be created in other classes.
• To construct objects from student class:
public class TestStudent {
public static void main(String[] args){
Student stu;
//To construct an object
stu = new Student();
System.out.println(stu.toString());
}
}](https://image.slidesharecdn.com/chapter6-ooprevision-151019085622-lva1-app6892/75/Objected-Oriented-Programming-with-Java-7-2048.jpg)
![Access Object’s Data and Methods
• To access method:
public class TestStudent {
public static void main(String[] args){
Student stu;
//To construct an object
stu = new Student(“123”,”Veasna”);
System.out.println(stu.toString());
}
}
• To access data:
• Usually, We don’t access the data. If you like, you can do like :
stu.id = 123 in case id is not private.](https://image.slidesharecdn.com/chapter6-ooprevision-151019085622-lva1-app6892/75/Objected-Oriented-Programming-with-Java-8-2048.jpg)
Uploaded byOum Saokosal
Objected-Oriented Programming with Java
This document provides an overview of object-oriented programming concepts in Java, including classes, objects, constructors, and accessing object data and methods. It defines a class as a template for creating objects, with data fields and behaviors like constructors and methods. Constructors are used to construct (create) objects from a class by initializing their data fields. Objects are then accessed by calling their methods, such as a toString() method to return the object's data as a string. The document also notes that Java is a pure object-oriented programming language and many other languages also use OOP.
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Similar to Objected-Oriented Programming with Java
Objected-Oriented Programming with Java
- 1. OBJECT-ORIENTED PROGRAMMING WITH JAVA OumSaokosal, Chief of Computer Science National Polytechnic Institute of Cambodia Tel: (855)-12-252-752 E-mail: oum_saokosal@yahoo.com
- 2. Chapter 6 Objectsand Classes (Revision) • OOP • Classes • Objects • Constructors • Accessing Object’s Data and Methods
- 3. Object-Oriented Programming • Whylearning OOP? • Java is a pure OOP • OOP provides more flexibility, modularity, clarity, reusability • Other Programming: C++, C#, VB .NET, ActionScript 3.0, Ruby etc. also use OOP. • 3 concepts of OOP: • Class Encapsulation • Class Inheritance • Polymorphism
- 4. Classes (1) • Whatis a class? • A class is similar to a template, blueprint or symbol (in Adobe Flash). • A class creates many objects. Class Objects
- 5. Classes (2) • Ina class, there are : • Data Fields (Properties) • Behavior: • Constructors • Methods public class Student { private int id, String name; public Student(){} public Student (int inputID, String inputName){ this.id = inputID; this.name = inputName; } public String toString(){ return id + name; } }
- 6. Constructors (1) • Whatis constructor? • A constructor is to construct (create) objects from a class. public class Student { private int id, String name; public Student(){} public Student (int inputID,String inputName){ this.id = inputID; this.name = inputName; } public String toString(){ return id + name; } }
- 7. Constructors (2) • Howto construct objects? • Usually, we have many classes in a projects. So the student class will be created in other classes. • To construct objects from student class: public class TestStudent { public static void main(String[] args){ Student stu; //To construct an object stu = new Student(); System.out.println(stu.toString()); } }
- 8. Access Object’s Dataand Methods • To access method: public class TestStudent { public static void main(String[] args){ Student stu; //To construct an object stu = new Student(“123”,”Veasna”); System.out.println(stu.toString()); } } • To access data: • Usually, We don’t access the data. If you like, you can do like : stu.id = 123 in case id is not private.
- 9.
- 10.