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Java Important Questions
Unit-III 1) Define an array. List and explain the arrays operations with neat example. 2) Write a java program to find the minimum and maximum element in an array. 3) Explain varying length arrays in java. 4) What is inheritance? List the different types of inheritance with neat diagram. 5) Explain multi-level inheritance with neat example. 6) Explain the following keywords. a) final b) super 7) Define method overriding. Explain method overriding with neat example. 8) What is abstract class? Write a java program to implement abstract class shape using dynamic method dispatching. 9) What is multiple inheritance. Explain how you can implement multiple inheritance in java using interfaces. 10) List the characteristics of interface. What are the advantages of default method and static methods in an interface. 11) Implement functional interface with neat example. Unit-IV 1) Define package. List and explain different types of packages. 2) Explain auto boxing and auto unboxing with neat examples. 3) List and explain built-in packages in java. 4) What is user defined package. Explain the process of user defined package and how to import that in another application. 5) What is the purpose of classpath in java. 6) Define an Exception. Draw the Exception class hierarchy with neat diagram. 7) Explain about checked Exception and unchecked Exception with an example. 8) Implement try with multi catch in java with neat example. 9) Explain the use of throw and throws keywords in java with neat examples. 10) Explain the process of user define Exception in java with neat example. Unit-V 1) List and explain the standard I/O Streams in java. [i.e System.in, System.out, System.err] 2) List the Byte Stream classes and write a java program to copy the data from one binary file another file. 3) List the Character Stream classes and write a java program to copy the data from one txt file to another. 4) Define String. List and explain any 6 methods of String class. 5) What is the difference between String and StringBuffer. List the methods of StringBuffer with an example. 6) Define a Thread. Explain the life cycle of a Thread with neat diagram. 7) Explain the process of creation of threads in java. [i.e by extends Thread class or by implements Runnable interface]. 8) Write a JAVA program that creates threads by extending Thread class. First thread display “Good Morning “every 1 sec, the second thread displays “Hello “every 2 seconds and the third display “Welcome” every 3 seconds 9) What Thread Synchronization? Explain it with a neat example. 10) Write a Program illustrating Daemon Threads. 11) Draw and explain the JDBC architecture with a neat diagram. 12) Write a java program to connect with mysql database. 13) Write a java program to insert the records into the table of mysql database. 14) Write a java program to perform the deletion of records from the table. 15) Write a java program to retrieve the data from a table of mysql database. 16) How to display a text and image using Java FX Scene Builder.
