When we implement the Runnable interface, we must define the method
start()
init()
runnable()
run()
Correct Answer :
D. run()
Related Questions
Which of the following string can be used as mode string for creating a RandomAccessFile object?
"rw"
"wr"
"0"
'w''
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
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
If m and n are int type variables, what will be the result of the expression
'm % n' when m = -14 and n = -3?
4
2
-2
-4
It is an error if a class with one or more abstract methods is not explicitly declared abstract.
True
False
Servlet has ___________
init method
doGet(------) method
All of the above methods.
With javadoc, which of the following denotes a javadoc comment?
//#
/*
/**
//**
Any method in a supper class can be over ridden in its subclass.
True
False
The name of a Java program file must match the name of the class with the extension Java.
True
False
executeUpdate(------------) returns ___________
Nothing
Returns a ResultSet object
Returns an integer value to show the no. of updated rows
None of the above.
JdbcOdbcDriver is an object of Object class
True
False
The break statement is required in the default case of a switch selection structure.
True
False
It is an error to have a method with the same signature in both the super class and its subclass.
True
False
The concept of multiple inheritance is implemented in Java by
extending two or more classes
extending one class and implementing one or more interfaces
all the above
When present, package must be the first no comment statement in the file.
True
False
To delete a file, we can use an instance of class file.
True
False
A panel can not be added to another panel.
True
False
We can over load methods with differences only in their return type.
True
False
Which of the following classes are available in the java.lang package?
Random
Stack
String Buffer
Vector
Which of the following are the wrapper classes?
Random
Vector
Byte
all of the above
JSP files creates ________________
html files
html files and java files
java files and class files
None of the above.
One the features of is that an array can store many different types of values.
True
False
Declarations can appear anywhere in the body of a Java method.
True
False
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.
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.
A constructor must always invoke its supper class constructor in its first statement.
True
False
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");
All the bitwise operators have the same level of precedence in Java.
True
False
The setBackground() method is part of the class
Applet
Component
Container
Object
Which of the following methods can be used to draw the outline of a square?
fillRect()
drawLine()
drawString()
all of the above