The methods wait() and noify() are defined in
java.lang.Thread
java.lang.Runnable
java.lang.Object
java.lang.ThreadGroup
Correct Answer :
C. java.lang.Object
Related Questions
When we implement the Runnable interface, we must define the method
start()
init()
runnable()
run()
Objects are passed to a method by use of call-by-reference.
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.
To delete a file, we can use an instance of class file.
True
False
JSP files creates ________________
html files
html files and java files
java files and class files
None of the above.
A static class method can be invoked by simply using the name of the method alone.
True
False
Which of the following represent legal flow control statements?
break;
break();
continue(inner);
all of the above
Every method of a final in class is implicitly final.
True
False
A catch can have comma-separated multiple arguments.
True
False
We can add more than one class(es) at the time of compilation Java Beans.
True.
False.
All methods in an abstract class must be declared abstract.
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
A variable declared inside the for loop control can not be referenced out side the loop.
True
False
The methods wait() and noify() are defined in
java.lang.Thread
java.lang.Runnable
java.lang.Object
java.lang.ThreadGroup
DataInput is
An abstract class defined is java.io.
A class we can use to read primitive data types.
An interface that defines methods to open files.
An interface that defines methods to read primitive data types.
Frames and applets cannot be used together in the same program.
True
False
Connection, Statement are interfaces and ResultSet is a class.
True.
False.
Which of the following string can be used as mode string for creating a RandomAccessFile object?
"rw"
"wr"
"0"
'w''
Which exception is thrown by the read() method of InputStream class?
IOException
FileNotFoundException
ReadException
None of the above
Any method in a supper class can be over ridden in its subclass.
True
False
DriverManager.getConnection("jdbc:odbc:dsn_name") method does not depend on the class.forName(...) method.
True.
False.
The break statement is required in the default case of a switch selection structure.
True
False
Which of the following command lines options generates documentation for all classes and methods?
-protected
-public
-private
-encoding
We can over load methods with differences only in their return type.
True
False
It is an error to have a method with the same signature in both the super class and its subclass.
True
False
One the features of is that an array can store many different types of values.
True
False
When present, package must be the first no comment statement in the file.
True
False
What is error in the following class definitions?
abstract class xy {
abstract sum(int x, int y) {
}
}
abstract sum(int x, int y) {
}
}
class header is not define properly
constructor is no defined
method is not defined properly
no error
Consider the following class definitions:
class maths {
student student1;
}
class student {
String name;
}
student student1;
}
class student {
String name;
}
This code represents:
an 'is a' relationship
a 'has a' relationship
both
neither
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