To delete a file, we can use an instance of class file.
True
False
Correct Answer :
A. True
Related Questions
A static class method can be invoked by simply using the name of the method alone.
True
False
A package is a collection of
classes
interface
editing tools
classes and interfaces
Which of the following control expressions are valid for an if statement?
an integer expression
a Boolean expression
either A or B
Neither A or B
A class may be both abstract and final.
True
False
JdbcOdbcDriver is an object of Object class
True
False
Give file is a file object, which of the following are legal statements to create a new file.
file.create();
FileOutputStream fos=new FileOutputStream(file);
FileInputStream fis=new FileInputStream(file);
all of the above
The name of a Java program file must match the name of the class with the extension Java.
True
False
A variable declared inside the for loop control can not be referenced out side the loop.
True
False
DriverManager.getConnection("jdbc:odbc:dsn_name") method does not depend on the class.forName(...) method.
True.
False.
Which of the following string can be used as mode string for creating a RandomAccessFile object?
"rw"
"wr"
"0"
'w''
Submit button always fires doPost(...)
True
False
A catch can have comma-separated multiple arguments.
True
False
It is perfectly legal to refer to any instance variable inside of a static method.
True
False
Every method of a final in class is implicitly final.
True
False
Which of the following methods can be used to remove a component from the display?
remove()
desappear()
hide()
move()
The expression (x == y && a<b) is true If either x == y is true or a<b is true.
True
False
The methods wait() and noify() are defined in
java.lang.Thread
java.lang.Runnable
java.lang.Object
java.lang.ThreadGroup
If you want to assign a value of 99 to the variable year, then which of the following lines can be used within an <applet> tags?
number=getParameter(99)
<number==99>
<param = radius value ==99>
The check box group class is a subclass of the component class.
True
False
When X is a positive number the operations x>> 2 and x>>>2 both produce the same result.
True
False
Consider the following code snippet:
try
{
int x=0; int y=50/x;
System.out.println("Division by zero");
}
catch(ArithmeticException e)
{
System.out.println("catch block");
}
What will be the output?
{
int x=0; int y=50/x;
System.out.println("Division by zero");
}
catch(ArithmeticException e)
{
System.out.println("catch block");
}
Error. Won't compile
Division by zero
Catch block
Division by zero catch block
If a=10 and b= 15, then the statement x =(a>b)?a:b; assigns the value 15 to x.
True
False
When we invoke repaint () for a Component, the AWT invokes the method:
draw()
update()
show()
paint()
When present, package must be the first no comment statement in the file.
True
False
A Java monitor must either extend thread class or implement Runnable interface.
True
False
Which of the following keywords are used to control access to a class member?
default
protected
interface
None of the above
What is wrong in the following class definitions?
abstract class print {
abstract show();
}
class Display extends print {
}
abstract show();
}
class Display extends print {
}
Nothing is wrong
Wrong Method show() should have a return type
Wrong Methods show() is not implemented in Display
Wrong Display does not contain any members.
Which exception is thrown by the read() method of InputStream class?
IOException
FileNotFoundException
ReadException
None of the above
putValue(...) method takes _____________________-
Two arguments of object type
First one is of a character type and second one is of an object type
First one is of an object type and second one is of a character type
None of the above.
Consider the following class definition.
Class Student extends String
{
}
What happens when we try to compile this class?
Will not compile because class body is not defined
Will not compile because class is not declared public
Will compile successfully.
Will not compile because String is abstract