- 1) Which statement(s) declare an array of string objects?
- String[] s
- String []s
- String[ s]
- String []s
- 2) Which of the following is true about constructor and method ?
- Constructor have its own name,and return type, innvoked using new operator
- Function has its own name, a return type and is invoked using the dot operator
- Constructor has name of class and no return type, and is innvoked using new operator
- 3) Basic I/O is performed by which class?
- Security Manager
- Math
- Run time
- System
- None of these above
- 3 ) An example of polymorphism :
- Inner Class
- Method Over Loading
- Method over ridding
- annonymouse class
- 4) Which is primitive type :
- byte
- String
- Float
- 5) 1.4.56+ "1.2" returns
- String 5.76
- Long 5
- Double 5.76
- String "4.561.2"
- 6) Asssuming that we have not provided any arguments on the command line, the first element of the string array in the main method contains:
- The name of the programe
- null
- empty
- the input for the program
- 7) How do you implement polymorphism in java?
- Method over loading
- Method over overridding through the java inter faces
- Method over overridding through inheritance
- 8) What is the output of the following code
int arrayint[][]=new int[10][20]
int arrayint1[][]={{1,2},{1,4},{6,5}} - 10 & 3
- 20 & 2
- 20 & 3
- 20 & 6
- 9) consider the following code sample
if(a!=null&&a.length()>0){ ...}
what will happen if replace && with &? - Logical error
- Null pointer exception
- There is no output
- None of the above
- 10) there are two classes class A and class B. If class A what to inform B some important information it uses which of the following method(s)
- notify(),notifyall(),wait()
- notify(),notifyall()
- notifyall(),wait()
- None of the above
- 11) when do we get a default constructor
- When the class has no other constructor
- When we define at least one constructor
- When we define a class
- None of the above
- 12) which of the following will output -6?
- System.out.println(Math.floor(-6.7))
- System.out.println(Math.ceil(-6.7))
- System.out.println(Math.Min(-6.7))
- System.out.println(Math.round(-6.7))
- 13) Which of the following are methods of math class
- Absolute()
- log()
- cosine()
- sine()
- None of the above
- 14) when two or more objects are added as listeners of the same event,which listerner will inovked first to handle the event?
- First object that was added as listener
- Last object that was added as listener
- There is no way to determine which listener will be invoked first
- it is impossible to have more than one listener for a given event
- 15) character literals are stored as unicode characters :
- true
- False
please correct me if i am make any mistake :(
