Java Core Classes and Threads

Question 1

Multiple choice

Which of the following objects in the java.util.EventObject is generated when an item from a list, a choice or a checkbox is selected?

ItemEvent
StockPresentation
The stackframe
MouseEvent
ActionEvent

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Answer

Java.net.BindException

Answer

Both (1) and (2)

Answer

getMaxColumnsInTable()

Answer

1, 2 and 3

Answer

getColumnCount()

Answer

Both (1) and (3)

Answer

setDefaultCloseOperation(int)

Answer

windowMoved()

Answer

ExceptionEvent

Answer

Both options 1 and 3

Answer

public void rest()

Question 2

Multiple choice

Which of the following objects in the java.util.EventObject is generated when the text of a text component is modified?

ActionEvent
TextEvent
Events
Stock
MouseEvent

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Question 3

Multiple choice

Which of the following operations on queue removes the front item from the queue and does not accept any arguments nor returns the item?

Queue()
enqueue(item)
dequeue()
isEmpty()
size()

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Question 4

Multiple choice

Which of the following operations in ordered lists is used to test whether a given object instance is in the container or not?

Insert
Withdraw
Find
isMember
Exit

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Question 5

Multiple choice

Which of the following exceptions is thrown by the Java compiler when we try to create a server socket on a port which is busy?

Java.net.BusyPortException
Java.net.UnknownHostException
Java.net.PortNotFoundException
Java.net.PortBusyException

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Question 6

Multiple choice

In Java network programming, which of the following methods is/are defined in “InetAddress” class?

getHostName();
getHostAddress();
getHostType();
Both (1) and (3)

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Question 7

Multiple choice

Which of the following methods is used to get the maximum number of columns that we can create in a table in Java database programming?

getMaxCols()
getMaxColsInTable()
getMaxColumns()
getCols()

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Question 8

Multiple choice

Which of the following methods is/are present in DatabaseMetadata interface in Java database programming?

getUserName()
getMaxTableNameLength()
getMaxColumnsInTable()
Only 2 and 3

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Question 9

Multiple choice

Which of the following methods is present in ResultSetMetadata interface?

getDriverVersion()
getDriverMajorVersion()
getDriverName()
getUserName()

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Question 10

Multiple choice

Which of the following methods is/are used by the web browser to control the applet?

class BitShift
{
public static
void main(String [] args)
{
int x = 0x80000000;
System.out.
print(x + " and ");
x = x >>> 31;
System.out.
println(x);
}
}

Wait()
Destroy()
Dead()
Both (1) and (2)

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Question 11

Multiple choice

Which of the following methods cannot be invoked from the instance of frame class in AWT?

public class If2
{
static boolean b1, b2;
public static void main(String [] args)
{
int x = 0;
if ( !b1 ) /* Line 7 */
{
if ( !b2 ) /* Line 9 */ { b1 = true;
x++; if ( 5 > 6 )
{
x++;
}
if ( !b1 ) x = x + 10;
else if ( b2 = true ) /* Line 19 */ x = x + 100;
else if ( b1 | b2 ) /* Line 21 */ x = x + 1000;
}
} System.out.println(x);
}
}

setLocation(int, int)
setVisible(Boolean)
setSize(int, int)
Pack()

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Question 12

Multiple choice

Which of the following methods is not necessary to define a class if it implements the windowListener interface?

public void test(int x)
{
int odd = 1;
if(odd)
{
System.out.println("odd");
}
else
{
System.out.println("even");
}
}

windowClosing()
windowIconified()
windowActivated()
windowDeiconified()

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Question 13

Multiple choice

Which of the following event types is invalid in Java?

class Equals
{
public static
void main(String [] args)
{
int x = 100;
double y = 100.1;
boolean b = (x = y);
/* Line 7 */ System.out.println(b);
}
}

FocusEvent
ComponentEvent
AdjustmentEvent
WindowEvent

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Question 14

Multiple choice

Which of the following statements is/are correct regarding the getParameterValues method?

This method accepts only a single argument.
This method can accepts multiple arguments.
This method returns an array of Strings containing all the values for that parameter.
Both options 2 and 3

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Question 15

Multiple choice

Which of the following methods is used to clear the buffer content and the status code and headers?

public void resetBuffer()
public void getBuffer()
public void setBufferSize()
None of the above

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Java Core Classes and Threads

Java Core Classes and Threads Questions