Java solution

Short Answer Question
1. What is thread
• Is a sequential flow of control in a process
2. What is the use of finally keyword
• Contains code to free the resource like file
handling, database connection etc
3. Which classes are used to read and write
bytes to file
• PrintStream (Write)
• Scanner (Read)

Short Answer Question…
4. Define interface
5. What is skeleton in RMI
ProductImpl_Skel (A skeleton class that is located
on the server (needed prior to JDK 1.2))
Server side stub is refered to as a skeleton
6.Why is java called architecturally neutral language
Platform Independent

7. Define package
8. Why is main function defined as static
To call by class name i.e. ClassName.main()
9. List the access specifier in java
Private, Public, Protected
10. Which function is used in servlet when data
is using get method
doGet()

Long Answer Question
1. What is nested class? Explain with suitable example.
• Class inside Class (Inner Class)
class A
{
public int temp;
public static class B
{
public int b;
}
public void test()
{
B b1 = new B();
b1.b = 10;
System.out.println(b1.b);
}
}
class TestFirstInnerClass
{
public static void main(String arg[])
{
A a1 = new A();
A.B binner = new A.B();
binner.b = 20;
System.out.println(binner.b);
a1.test();
}
}

Long Answer Question…
2. Java code to connect database
class DataBase
{
public static void main(String agr[]) throws Exception
{
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
Connection conn = DriverManager.getConnection("jdbc:odbc:Library10","","");
String str="insert into titles values(1,'java','comuter',3434)";
Statement stat = conn.createStatement();
stat.executeUpdate(str);
conn.close();
}
}

3. RMI and Its Steps
 Creating Remote Interface
 Implementing the Remote Interface
 Creating main server class which register the
remote object
 Client consuming the server’s method

5. AWT (Abstract Windows Toolkit).

CODE…
public class AWTTest extends Frame{
public Label lbl1 = new Label("Enter a number:");
public Label lbl2 = new Label("Enter a number:");
public TextField fld1 = new TextField(10);
public TextField fld2 = new TextField(10);
public Button btn = new Button("OK");
public AWTTest()
{
setLayout(new BorderLayout());
add(lbl1);
add(fld1);
add(lbl2);
add(fld2);
add(btn);
setSize(250, 250);
setVisible(true);
}
{
new AWTTest();
}
}

6. Event Handling Example

public class EventTest extends JFrame implements ActionListener{
public JLabel lbl1 = new JLabel("Enter a number:");
public JLabel lbl2 = new JLabel("Enter a number:");
public JTextField fld1 = new JTextField(10);
public JButton btn = new JButton("OK");
public EventTest()
{
setLayout(new FlowLayout());
add(lbl1);
add(fld1);
add(lbl2);
add(fld2);
add(btn);
add(fld3);
btn.addActionListener(this);
setSize(250, 250);
setVisible(true);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
public void actionPerformed(ActionEvent e)
{
int a = Integer.parseInt(fld1.getText());
int b = Integer.parseInt(fld2.getText());
int c = a + b;
fld3.setText(String.valueOf(c));
}
{
new EventTest();
}
}

7. Java Beans
• A reusable software component that can be manipulated visually in a
‘builder tool’. (from JavaBean Specification)
• The JavaBeans API provides a framework for defining reusable,
embeddable, modular software components
• Software components written in Java
• Event Handling

8. Applet
 A Java applet is an applet delivered to users in the form of Java bytecode
 Java applets can be part of a web page and executed by the Java Virtual
Machine (JVM) in a process separate from the web browser, or run
in Sun's AppletViewer
 Give Example
9. Final Keyword
 To make the constant
 To stop the class from being inherited
 Give Example

2011
1. What is bytecode?
 Java bytecode is the form of instructions that the Java virtual
machine executes
2. What is parameter marshalling?
 Transfer of parameters (or marshalling) is done by the RMI
3. What is synchronization?
 Synchronization is a feature by which only one thread can access a resource in a
particular time of instance.
 No other thread can interrupt for that resource

4. What is an exception?
 An exception is an event, which occurs during the execution of a program, that
disrupts the normal flow of the program's instructions
 Example :- NullPointerException, DivideByZeroException, dereference of a null
pointer, out-of-bounds array access, attempt to open a non-existent file for reading
5. How do you create a new package in java?
package <package_name>
6. Differentiate between AWT and Swing
Heavyweight vs Lightweight

8. How does java support runtime
polymorphism?
 Function Overriding
9. Why are character streams more convenient
for handling in java?
 Text-based I/O works with streams of human-readable characters, while data-based
I/O works with streams of binary data
10. Interface and abstract class
 All methods of interface are by default abstract
 Only abstract method of abstract class are abstract
 Examples

Long Answer Questions
1. Event handling with addition and subtraction
Example
2. Thread priority

Every Java thread has a priority that helps the operating system determine the
order in which threads are scheduled
 ThreadObject.setPriority(num)
 MIN (1) and MAX(10) NORMAL(5)
3. Socket
 Programs manage each client connection with a Socket object
 Socket allows the server to interact with the client
 Example

Long Answer Questions…
4. Prepared Statement

2012
1. What is SQLException
If the DriverManager cannot connect to the database
2. Are the java always platform independent?
No if java has called the native file
3. States of a thread in java
New, Blocked, Running, Wait, Runnable
4. Name the event generated by the button
ActionEvent, ItemEvent (by list items)
5. Use of import
To import the API of java

6. rebind() method
Register the server object in RMI
7. read() method
To read the buffer string

Java solution

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