Quiz: Exception in Java

What is the purpose of assertions?

Consider the following code:

public class ExceptionTest {
    public static void main(String[] args) {
        try {
            throw new Exception("Test");
        } catch (Exception e) {
            try {
                throw new RuntimeException("Inner");
            } catch (RuntimeException re) {
                System.out.print(re.getMessage() + " ");
            }
        } finally {
            System.out.print("Finally ");
        }
        System.out.print("End");
    }
}

What is the output?

Consider the following code.

public class ExceptionTest {
    public static void main(String[] args) {
        try{
            throw new MyException();
        }catch(Exception e){
            System.out.print(e.getMessage());
        }
    }
    static class MyException extends Exception{
        MyException(){super("Custom Exception");}
    }
}

What is the output?

Consider the following code:

public class ExceptionTest {
    public static void main(String[] args) {
        try {
            try {
                throw new Exception("Inner");
            } finally {
                System.out.print("F");
            }
        } catch (Exception e) {
            System.out.print("C");
        }
        System.out.print("E");
    }
}

What is the output?

Consider the following code:

public class ExceptionTest {
    public static void main(String[] args) {
        try {
            assert false;
            System.out.print("A");
        } catch (AssertionError e) {
            System.out.print("B");
        } finally {
            System.out.print("C");
        }
        System.out.print("D");
    }
}

If assertions are enabled using -ea, what is the output?

What is the purpose of multiple catch blocks?

By default, are assertions enabled or disabled in Java?

How do you create a custom exception in Java?

Consider the following code:

public class ExceptionTest {
    public static void main(String[] args) {
        try {
            System.out.print("1");
            throw new Exception();
        } catch (Exception e) {
            System.out.print("2");
            return;
        } finally {
            System.out.print("3");
        }
        System.out.print("4");
    }
}

What is the output?

Consider the following code:

public class ExceptionTest {
    public static void main(String[] args) {
        try {
            method1();
        } catch (Exception e) {
            System.out.print("C");
        }
    }

    static void method1() throws Exception {
        try {
            throw new RuntimeException("A");
        } catch (RuntimeException e) {
            System.out.print("B");
            throw new Exception("D");
        } finally {
            System.out.print("E");
        }
    }
}

What is the output?

Consider the following code:

public class ExceptionTest {
    public static void main(String[] args) {
        try {
            System.out.print("A");
            throw new RuntimeException();
        } finally {
            System.out.print("B");
        }
    }
}

What is the output?

Consider the following code:

public class ExceptionTest{
    public static void main(String[] args){
        try{
            System.out.print("1");
            int a = 1/0;
        }catch(RuntimeException e){
            System.out.print("2");
        }catch(Exception e){
            System.out.print("3");
        }finally{
            System.out.print("4");
        }
    }
}

What is the output?

Which keyword is used to declare that a method might throw an exception?

Which keyword is used to define an assertion in Java?

Consider the following code:

public class ExceptionTest {
    public static void main(String[] args) {
        try {
            System.out.print("A");
            int x = 10 / 0;
            System.out.print("B");
        } catch (ArithmeticException e) {
            System.out.print("C");
        } finally {
            System.out.print("D");
        }
        System.out.print("E");
    }
}

What is the output?