Which are the valid ways to create DataInputStream streams?
new DataInputStream(new File("in.dat"));
new DataInputStream(new FileInputStream("in.dat"));
new DataInputStream("in.dat");
new DataInputStream("in.data","r");
Correct Answer :
B. new DataInputStream(new FileInputStream("in.dat"));
Related Questions
The check box group class is a subclass of the component class.
True
False
When the string objects are compared with ==, the result is true If the strings contain the same values.
True
False
Which of the following methods can be used to draw the outline of a square?
fillRect()
drawLine()
drawString()
all of the above
The import statement is always the first no comment statement in a Java program files.
True
False
In evaluating a logical expression of type 'Boolean expression 1&& Boolean expression 2', both the Boolean expressions are not always evaluated.
True
False
A variable declared inside the for loop control can not be referenced out side the loop.
True
False
Which of the following keywords are used to control access to a class member?
default
protected
interface
None of the above
Which of the following methods can be used to remove a component from the display?
remove()
desappear()
hide()
move()
We can add more than one class(es) at the time of compilation Java Beans.
True.
False.
DriverManager.getConnection("jdbc:odbc:dsn_name") method does not depend on the class.forName(...) method.
True.
False.
What does the following line of code do?
TextField text=new TextField(10);
Creates text object that can hold 10 rows of text.
Creates text object that can hold 10 columns of text.
Creates the object text and initializes it with the value 10.
The code is illegal.
One the features of is that an array can store many different types of values.
True
False
All methods in an abstract class must be declared abstract.
True
False
Java always provides a default constructor to a class.
True
False
Which of the following statements are true?
UTF characters are all 24 bits.
Reader class has methods that can read integers and floats.
Unicode characters are all 16 bits.
all of the above
When we invoke repaint () for a Component, the AWT invokes the method:
draw()
update()
show()
paint()
A final class may not have any abstract method.
True
False
The modulus operator (%) can be used only with Integer operands.
True
False
In a single Servlet class we can use____________
doGet(...) method only
doPost(...) method only
doGet(...) method and doPost(...) method both at a time.
Either 'a' or 'b'
The use of protected keyword to a member in a class will restrict its visibility as follows:
Visibility only in the class and its subclasses in the same package.
Visibility only inside the same package.
Visibility in all classes in the same package and subclasses in other packages.
Visibility only in the class where it is declared.
We would like to make a member of a class visible in all subclasses regardless of what package they are in. Which one of the following keywords would achieve this?
private
protected
public
private protected
Which of the following statements are true?
An abstract class may not have any final methods?
A final class may not have any abstracts methods.
Transient variables must be static.
all of the above
An individual array element that is passed to a method and modified in that method will contain the modified value when the called method completes execution.
True
False
Which of the following will produce a value of 10 if x = 9.7?
floor(x)
abs(x)
rint(x)
round(x)
The methods wait() and noify() are defined in
java.lang.Thread
java.lang.Runnable
java.lang.Object
java.lang.ThreadGroup
Which of the following statements are valid array declarations?
int number();
float average[];
double[] marks;
counter int[];
Which of the following are keywords?
integer
default
Boolean
Object
Which exception is thrown by the read() method of InputStream class?
IOException
FileNotFoundException
ReadException
None of the above
A constructor must always invoke its supper class constructor in its first statement.
True
False
Which of the following string can be used as mode string for creating a RandomAccessFile object?
"rw"
"wr"
"0"
'w''