Constructors and Methods -Java Programming MCQ Questions and Answers

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51.
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();
      }
}

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52.
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++;
      }
}

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53.
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
	}
}

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54. 
public class MyClass{ }

For the above class(MyClass) what is the correct way of declaring constructor?

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55.
What is the output for the below code?
public class A{
      int add(int i, int j){
            return i+j;
      }
}
public class B extends A{
      public static void main(String argv[]){
            short s = 9;
            System.out.println(add(s,6));
      }
}

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56.
What will be the output?
public class Test{
      public static void main(String[] args){
            String value = "abc";
            changeValue(value);
            System.out.println(value);
      }

      public static void changeValue(String a){
            a = "xyz";
      }
}

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57.
What is the output for the below code?
public class Test{
      public static void printValue(int i, int j, int k){
            System.out.println("int");
      }

      public static void printValue(byte...b){
            System.out.println("long");
      }

      public static void main(String... args){
            byte b = 9;
            printValue(b,b,b);
      }
}

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58. 
class A{
      A(String s){}

      A(){}
}

class B extends A{
      B(){}
      B(String s){
            super(s);
      }
      void test(){
            // insert code here
      }
}

Which of the below code can be insert at line 7 to make clean compilation ?

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59.
What is the output for the below code?
class A{
      public A(){
            System.out.println("A");
      }
      public A(int i){
            this();
            System.out.println(i);
      }
}
class B extends A{
      public B(){
            System.out.println("B");
      }
      public B(int i){
            this();
            System.out.println(i+3);
      }
}
public class Test{
      public static void main (String[] args){
            new B(5);
      }
}

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60.
Which of these is a legal definition of a method named examveda assuming it throws IOException, and returns void. Also assume that the method does not take any arguments. Select the one correct answer.

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