Which of the following classes are available in the java.lang package?
Random
Stack
String Buffer
Vector
Correct Answer :
A. Random
Related Questions
Two methods cannot have the same name in Java.
True
False
The default case is always required in the switch selection structure.
True
False
A thread can make second thread ineligible for execution by calling the suspend (-) method on second thread.
True
False
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.
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.
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");
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
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
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
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
executeUpdate(------------) returns ___________
Nothing
Returns a ResultSet object
Returns an integer value to show the no. of updated rows
None of the above.
A package is a collection of
classes
interface
editing tools
classes and interfaces
We can over load methods with differences only in their return type.
True
False
With javadoc, which of the following denotes a javadoc comment?
//#
/*
/**
//**
Connection, Statement are interfaces and ResultSet is a class.
True.
False.
It is perfectly legal to refer to any instance variable inside of a static method.
True
False
A JSP file can be stored_________________
With the extension .jsp in servlets folder of the jws
With the extension .html in public_html folder of the jws
With the extension .jsp in public_html folder of the jws
None of the above.
To delete a file, we can use an instance of class file.
True
False
Throwing an exception always causes program termination.
True
False
Which of the following methods can be used to draw the outline of a square?
fillRect()
drawLine()
drawString()
all of the above
Which of the following string can be used as mode string for creating a RandomAccessFile object?
"rw"
"wr"
"0"
'w''
When present, package must be the first no comment statement in the file.
True
False
A string object can not be modified after it is created.
True
False
The length of a string object 's1' can be obtained using the expression s1.length.
True
False
A variable declared inside the for loop control can not be referenced out side the loop.
True
False
executeUpdate automatically updates data because___________
auto commit is on, by default
It performs a hidden commit statement as well
Does not commit
None of the above.
Which of the following are not keywords?
NULL
Implements
Protected
None of the above
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>
When we implement the Runnable interface, we must define the method
start()
init()
runnable()
run()