Question 1 of 25
Hints left: 3
Q1
Determine output: class MyClass{ int i; int j; public MyClass(int i, int j){ this.i = i; this.j = j; } public void call(){ System.out.print("One"); } } public class Test{ public static void main(String args[]){ MyClass m = new MyClass(); //line 1 m.call(); //line 2 } }
Q2
What is the prototype of the default constructor? public class Test { }
Q3
What is the output of the above program? class Num { Num(double x ){ System.out.println( x ) ; } } public class Test extends Num { public static void main(String[] args){ Num num = new Num( 2 ) ; } }
Q4
public class MyClass{ } For the above class(MyClass) what is the correct way of declaring constructor?
Q5
Which of the following statements regarding static methods are correct? 1. Static methods are difficult to maintain, because you can not change their implementation. 2. Static methods can be called using an object reference to an object of the class in which this method is defined. 3. Static methods are always public, because they are defined at class-level. 4. Static methods do not have direct access to non-static methods which are defined inside the same class.
Q6
In which area of memory, the system stores parameters and local variables whenever a method is invoked?
Q7
The main method should be static for the reason
Q8
In Java, what is the purpose of method overloading?
Q9
Which of the following options is the best for generating random integer 0 or 1?
Q10
What is the expected output? public class Profile { private Profile(int w) { // line 1 System.out.print(w); } public static Profile() { // line 5 System.out.print (10); } public static void main(String args[]) { Profile obj = new Profile(50); } }
Q11
What is the expected output? public class Profile { private Profile(int w) { // line 1 System.out.print(w); } public final Profile() { // line 5 System.out.print(10); } public static void main(String args[]) { Profile obj = new Profile(50); } }
Q12
Which of the modifier can't be used for constructors?
Q13
What is the output of the program? class Test{ public int display(int x, int y){ return ("The sum of x and y is " + x + y); } public static void main(String args[]){ Test test = new Test(); System.out.println(test.display(4,5)); } }
Q14
What is the expected output? class Animal { Animal() { System.out.println("Animal"); } } class Wild extends Animal{ Wild() { System.out.println("Wild"); super(); } } public class Test { public static void main(String args[]) { Wild wild = new Wild(); } }
Q15
The finalize() method is called just prior to
Q16
Given the following piece of code: class Person{ public int number; } public class Test{ public void doIt(int i , Person p){ i = 5; p.number = 8; } public static void main(String args[]){ int x = 0; Person p = new Person(); new Test().doIt(x, p); System.out.println(x + " " + p.number); } } What is the result?
Q17
The variables declared in a class for the use of all methods of the class are called
Q18
Determine output: public class Test{ public static void main(String args[]){ MyClass obj = new MyClass(); obj.val = 1; obj.call(obj); System.out.println(obj.val); } } class MyClass{ public int val; public void call(MyClass ref){ ref.val++; } }
Q19
What is the output of the program? class MyClass{ MyClass(){ System.out.print("one"); } public void myMethod(){ this(); System.out.print("two"); } } public class TestClass{ public static void main(String args[]){ MyClass obj = new MyClass(); obj.myMethod(); } }
Q20
Determine output of the following program. public class Test{ public static void main(String args[]){ System.out.println( Math.floor( Math.random( ) ) ) ; } }
Q21
The following code contains one compilation error, find it? public class Test { Test() { } // line 1 static void Test() { this(); } // line 2 public static void main(String[] args) { // line 3 Test(); // line 4 } }
Q22
The implicit return type of a constructor is
Q23
What is Math.floor(3.6)?
Q24
What will be the return type of a method that not returns any value?
Q25
Determine Output: class A{ public static void method(int i){ System.out.print("Method 1"); } public static int method(String str){ System.out.print("Method 2"); return 0; } } public class Test{ public static void main(String args[]){ A.method(5); } }