What is java -g used for?
Using the jdb tool
Executing a class with optimization turned off
To provided information about deprecated methods
Non of the above
Correct Answer :
B. Executing a class with optimization turned off
Related Questions
A static class method can be invoked by simply using the name of the method alone.
True
False
All the bitwise operators have the same level of precedence in Java.
True
False
The check box group class is a subclass of the component class.
True
False
Consider the following statements:
int x = 10, y = 15;
x = ((x < y) ? (y + x) : (y - x);
What will be the value of x after executing these statements?
x = ((x < y) ? (y + x) : (y - x);
25
15
5
Error can't be executed.
A thread can make second thread ineligible for execution by calling the suspend (-) method on second thread.
True
False
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
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.
Session bean
Represents a single client inside the application server
Can not be shared
Is not persistent
Satisfies all of the above conditions
The keywords reserved but not used in the initial version of Java re:
Synchronized
Boolean
union
goto
forName() is a static factory method
True
False
For all insert, update, delete, query operations on a database, ResultSet object creation is mandatory.
True.
False.
JSP files creates ________________
html files
html files and java files
java files and class files
None of the above.
Which of the following classes are available in the java.lang package?
Random
Stack
String Buffer
Vector
A final class may not have any abstract method.
True
False
DriverManager.getConnection("jdbc:odbc:dsn_name") method does not depend on the class.forName(...) method.
True.
False.
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
Java is fully object oriented programme.
true
false
The modulus operator (%) can be used only with Integer operands.
True
False
Every method of a final in class is implicitly final.
True
False
Which of the following represent legal flow control statements?
break();
continue(inner);
return;
exit();
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 exception is thrown by the read() method of InputStream class?
IOException
FileNotFoundException
ReadException
None of the above
Submit button always fires doPost(...)
True
False
EJBs can be of the following type(s)
None of the above
Entity Bean
Session Bean
Message-driven bean
All of the above
Which of the following methods can be used to remove a component from the display?
remove()
desappear()
hide()
move()
When present, package must be the first no comment statement in the file.
True
False
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.
Objects are passed to a method by use of call-by-reference.
True
False
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.
A catch can have comma-separated multiple arguments.
True
False