math quiz

1.

Question: Identify correct statements about java.io.Console class?

Select 1 option(s)

You can read both binary and character data from Console object but you cannot write to it.

You can read character data from a console but not write to it.

You can read as well as write only character data from/to it.

You can read both binary and character data from Console object but you can only write character data to it.

2.

Question: Identify correct statements about the following code-

interface Drink{

default double getAlcoholPercent(){

return 0.0;

}

static double computeAlcoholPercent(){

return 0.0;

}

interface ColdDrink extends Drink{

String getName();

}

class CrazyDrink implements ColdDrink{

// INSERT CODE HERE

}

Select 1 option(s)

CrazyDrink must either implement getName as well as getAlcoholPercent or be marked abstract.

CrazyDrink must either implement getName as well as computeAlcoholPercent or be marked abstract.

CrazyDrink must either implement getName or be marked abstract.

CrazyDrink must either implement getName or be marked abstract. Further, computeAlcoholPercent must be removed from Drink.

3.

Question: Consider the following program:

public class TestClass{

public static void main(String[] args) { calculate(2); }

public static void calculate(int x){

String val;

switch(x){

case 2:

default:

val = "def";

}

System.out.println(val);

}

What will happen if you try to compile and run the program?

Select 2 option(s)

It will compile for any int values in calculate(...);

It will compile and print def.

It will not compile saying that variable val may not have been initialized.

As such it will not compile but it will compile if calculate(2); is replaced by calculate(3);

4.

Question: What will the following program print?

public class TestClass{

static String str = "Hello World";

public static void changeIt(String s){

s = "Good bye world";

}

public static void main(String[] args){

changeIt(str);

System.out.println(str);

}

Select 1 option(s)

It will not compile.

"Hello World"

"Good bye world"

None of the above.

It will throw an exception at runtime.

5.

Question: Given:

class Booby{

}

class Dooby extends Booby{

}

class Tooby extends Dooby{

}

public class TestClass {

Booby b = new Booby();

Tooby t = new Tooby();

public void do1(List dataList){

//1 INSERT CODE HERE

}

public void do2(List dataList){

//2 INSERT CODE HERE

}

and the following four statements:

b = dataList.get(0);
t = dataList.get(0);
dataList.add(b);
dataList.add(t);

What can be inserted in the above code?

Select 1 option(s)

Statements 1 and 2 can inserted at //1 and Statements 3 and 4 can be inserted at //2.

Statement 4 can inserted at //1 and Statement 1 can be inserted at //2.

Statements 3 and 4 can inserted at //1 and Statements 1 and 2 can be inserted at //2.

Statements 1 and 3 can inserted at //1 and Statements 2 and 4 can be inserted at //2.

Statement 1 can inserted at //1 and Statement 4 can be inserted at //2.

math quiz

Question: Identify correct statements about java.io.Console class?

Question: Identify correct statements about the following code-

Question: Consider the following program:

Question: What will the following program print?

Question: Given:

Question: Given:

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