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PPT OF JAWA (1).pdf
The document provides an overview of Java, a popular programming language developed by James Gosling at Sun Microsystems, first released in 1995. It outlines various types of Java courses and explains different class types in Java, including static, final, abstract, concrete, singleton, POJO, and inner classes. The document serves as an introduction to Java programming concepts and classes.
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PPT OF JAWA (1).pdf
- 1. What is Jawa courseAbout
- 2. Information of jawa Javais a computer programming language developed by James Gosling at Sun Microsystems. Java was first released in 1995 and has since become one of the most popular programming languages with an estimated 12 million developers using it. Depending on the expertise level and study pace, it can take anywhere from 3 months to a year or two to complete a Java course
- 3. Types of JawaCourses Static Class. Final Class. Abstract Class. Concrete Class. Singleton Class. POJO Class. Inner Class.
- 4. static class Static classesare sealed and therefore cannot be inherited. They cannot inherit from any class or interface except Object. Static classes cannot contain an instance constructor. However, they can contain a static constructor.
- 5. Final Class The finalclass is a class that is declared with the final keyword. We can restrict class inheritance by making use of the final class. Final classes cannot be extended or inherited. If we try to inherit a final class, then the compiler throws an error during compilation.
- 6. Abstract class To createan abstract class, just use the abstract keyword before the class keyword, in the class declaration. You can observe that except abstract methods the Employee class is same as normal class in Java. The class is now abstract, but it still has three fields, seven methods, and one constructor.
- 7. Concrate class A concreteclass in java is a class that has all its methods implemented. For any class to be classified as concrete, it cannot have any unimplemented methods. Concrete classes can extend abstract classes or implement interfaces, but they must implement all the methods of the abstract class or interface they inherit
- 8. Singleton class Singleton patternrestricts the instantiation of a class and ensures that only one instance of the class exists in the Java Virtual Machine. The singleton class must provide a global access point to get the instance of the class. Singleton pattern is used for logging, drivers objects, caching, and thread pool
- 9. POJO CLASS The POJOclass in java is used to implement readability & reusability. The POJO class in java is an object class that encapsulates the Business logic. The POJO class fields can be public, private, or protected. JavaBeans are classes that encapsulate many objects into a single object.
- 10. Inner Class An innerclass in Java is defined as a class that is declared inside another class. Inner classes are often used to create helper classes, such as views or adapters that are used by the outer class. Inner classes can also be used to create nested data structures, such as a linked list
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