What is the printout of the following switch statement char ch = 'a'; switch (ch){ case 'a': case 'A': System.out.print(ch); break; case 'b': case 'B': System.out.print(ch); break; case 'c': case 'C': System.out.print(ch); break; case 'd': case 'D': System.out.print(ch); }?

LohaHridoy
  1. abcd
  2. aa
  3. a
  4. ab
  5. abc

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AhmedNazir

Call

Answer: Option 3

Let'

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What is the result of compiling and running this code main() { char string[] = "Hello World"; display(string); } void display(char *string) { printf("%s", string); }?

Answer: Option 2 Compiler Error : Type mismatch in redeclaration of function display As the function display() is not defined before use, compiler will assume the return type of the function...

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What is the output for the below code class A{ int k; boolean istrue; static int p; public void printValue(){ System.out.print(k); System.out.print(istrue); System.out.print(p); } } public class Test{ public static void main(String argv[]){ A a = new A(); a.printValue(); } }?

Answer: Option 1 Global and static variable need not be initialized before use. Default value of global and static int variable is zero. Default value of boolean variable is false....

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What is the result of compiling and running the following code class Base{ private Base(){ System.out.print("Base"); } } public class test extends Base{ public test(){ System.out.print("Derived"); } public static void main(String[] args){ new test(); } }?

Answer: Option 4 Implicit super constructor Base is not visible, must explicitly invoke another constructor.

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What is the result of compiling and running the following code class Base{ public Base(){ System.out.print("Base"); } } public class Derived extends Base{ public Derived(){ this("Examveda"); System.out.print("Derived"); } public Derived(String s){ System.out.print(s); } public static void main(String[] args){ new Derived(); } }?

Answer: Option 3 1. new Derived(); statement executes and invoke the non-parametrized constructor of derived class i.e. public Derived(); 2. As Derived class is a subclass of class Base so super(); executes...

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What will be the following code's output if choice = 'R' switch(choice) { case 'R' : printf("RED"); case 'W' : printf("WHITE"); case 'B' : printf("BLUE"); default : printf("ERROR");break; }?

Answer: Option 2 As the first option is matching, the cases are evaluated till the break statement is encountered or end of switch statement is encountered.

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What will be the result of compiling and executing the following program code class Vehicle{ public void printSound(){ System.out.print("vehicle"); } } class Car extends Vehicle{ public void printSound(){ System.out.print("car"); } } class Bike extends Vehicle{ public void printSound(){ System.out.print("bike"); } } public class Test{ public static void main(String[] args){ Vehicle v = new Car(); Bike b = (Bike) v; v.printSound(); b.printSound(); } }?

Answer: Option 2 Let'

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What will be the output of the following piece of code: class Person{ public void talk() {} } public class Test{ public static void main(String args[]){ Person p = null; try{ p.talk(); } catch(NullPointerException e){ System.out.print("There is a NullPointerException. "); } catch(Exception e){ System.out.print("There is an Exception. "); } System.out.print("Everything went fine. "); } }?

Answer: Option 1 Let'

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What will be the result after the class Test execution class A{ public void doA(){ B b = new B(); b.dobB(); System.out.print("doA"); } } class B{ public void dobB(){ C c = new C(); c.doC(); System.out.print("doB"); } } class C{ public void doC(){ if(true) throw new NullPointerException(); System.out.print("doC"); } } public class Test{ public static void main(String args[]){ try{ A a = new A(); a.doA(); }catch(Exception ex){ System.out.print("error"); } } }?

Answer: Option 4 Let'

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What will be the output after compiling and executing the following code public class Test implements Runnable{ public static void main(String[] args) throws InterruptedException{ Thread a = new Thread(new Test()); a.start(); System.out.print("Begin"); a.join(); System.out.print("End"); } public void run(){ System.out.print("Run"); } }?

Answer: Option 3 Let'

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Given the code. What will be the result public class Test implements Runnable{ public static void main(String[] args) throws InterruptedException{ Thread a = new Thread(new Test()); a.start(); System.out.print("Begin"); a.join(); System.out.print("End"); } public void run(){ System.out.print("Run"); } }?

Answer: Option 3 Let'

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