BCA 3 - Core Java Assignments

Core Java

Descriptive Questions:
1.Define the term Class and Objects. Discuss the concept of Constructor with suitable example.
2.Differentiate between a constructor and a method
3.What is polymorphism? Explain run-time polymorphism with example.
4.Write a program to demonstrate any five string operations using string class.
5.What is difference between String and String buffer and explain 3 methods of String and StringBuffer class with example.
6.State the difference between interface and abstract class with example.
7.What is constructor? Explain constructor overloading with example.
8.Method overriding & Overriding
9.What is the use of this & super keyword?
10.What is static? How to create static method?

JDBC

Descriptive Questions:
1.What are the steps in the JDBC connection? Explain in detail
2.State the purpose of the following JDBC classes and interfaces
   i) Driver manager ii) Connection iii) Statement
3.Write JDBC programs to demonstrate CRUD(create,read,update,delete) operations on table student (rollno, name, marks, grade).
4.Explain types of JDBC drivers with suitable example.

Comments

Post a Comment

Popular posts from this blog

Advanced Java - JDBC

Image
  Introduction to Java JDBC JDBC stands for Java Database Connectivity. JDBC API is a Java API which is used to access tabular data, especially which are stored in the relational database. JDBC works with Java on platforms like Windows, MacOS, and UNIX. What is JDBC? JDBC is used for connecting java programming language with databases. JDBC library has APIs for each task, which is mentioned below. Creating a connection to a database. Creating statements for SQL or MySQL. Executing queries using SQL or MySQL in the database. Viewing & modifying the resulting records. JDBC provides a complete set of an interface which allows access to the database. It can also be used by different types of executables, they are as follows: Java Applications Java Applets Java Servlets Java ServerPages (JSPs) Enterprise JavaBeans (EJBs). All these executables are able to use a JDBC driver to access a database. The java.sql package contains classes and interfaces for JDBC API. Following is a
Read more

Core Java BCA3

Image
    Q. Explain JDK, JRE and JVM?   Q.Why is Java ‘write once and run anywhere’(WORA)? Java applications are called WORA (Write Once Run Anywhere) . This means a programmer can develop Java code on one system and can expect it to run on any other Java-enabled system without any adjustment. This is all possible because of JVM. How Java is WORA: In traditional programming languages like C, C++ when programs were compiled, they used to be converted into the code understood by the particular underlying hardware, so If we try to run the same code at another machine with different hardware, which understands different code will cause an error, so you have to re-compile the code to be understood by the new hardware. In Java, the program is not converted to code directly understood by Hardware, rather it is converted to  bytecode(.class file), which is interpreted by JVM, so once compiled it generates bytecode file, which can be run anywhere (any machine) which has JVM( Java Virtual
Read more

Java Threads

Image
  Thread States (Thread Life Cycle)  The following diagram helps you visually understand the thread states and transitions between them: A thread can go through various states during its life. The  Thread ’s  getState()  method returns an enum constant that indicates current state of the thread, which falls in one of the following values: - RUNNABLE - BLOCKED - WAITING - TIMED_WAITING - TERMINATED These enum constants are defined in the  Thread.State  enum. Let me explain each state in details. NEW : when a thread is created but has not executed (the  start()  method has not been invoked), it is in the new state.   RUNNABLE : when the  start()  method has been invoked, the thread enters the runnable state, and its  run()  method is executing. Note that the thread can come back to runnable state from another state (waiting, blocked), but it may not be picked immediately by the thread scheduler, hence the term “runnable”, not running.   BLOCKED : when a thread tries to acquire an intrins
Read more