Which of the following method calls are valid ways to fill in the blank line of code?

class Car{ public void m1(){ System.out.println("Car 1"); } public void m2(){ System.out.println("Car 2"); } public String toString(){ return "vroom"; } } class Truck extends Car{ public void m1() { System.out.println("Truck 1"); } public String toString() { return super.toString() + super.toString(); } public void m3() { System.out.println("Only in truck"); } }

public class Driver{ public static void main(String [] args){ Car mycar; mycar = new Car(); System.out.println(mycar);

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} }

		1)mycar.m2();
		2)mycar.m3();
		3)mycar.m1();

QUESTION 2

Which of the following method calls are valid ways to fill in the blank line of code?

class Car{ public void m1(){ System.out.println("Car 1"); } public void m2(){ System.out.println("Car 2"); } public String toString(){ return "vroom"; } } class Truck extends Car{ public void m1() { System.out.println("Truck 1"); } public String toString() { return super.toString() + super.toString(); } public void m3() { System.out.println("Only in truck"); } }

public class Driver{ public static void main(String [] args){ Truck mytruck; mytruck = new Truck();

System.out.println(mytruck);

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} }

		1)mytruck.m1();
		2)mytruck.m3();
		3)mytruck.m2();

QUESTION 3

Which of the following method calls are valid ways to fill in the blank line of code?

class Car{ public void m1(){ System.out.println("Car 1"); } public void m2(){ System.out.println("Car 2"); } public String toString(){ return "vroom"; } } class Truck extends Car{ public void m1() { System.out.println("Truck 1"); } public String toString() { return super.toString() + super.toString(); } public void m3() { System.out.println("Only in truck"); } }

public class Driver{ public static void main(String [] args){ Car mycar; mycar = new Truck();

System.out.println(mycar);

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} }

		1)mycar.m2();
		2)mycar.m3();
		3)mycar.m1();

QUESTION 4

What is the output of the following program?

class Car{ public void m1(){ System.out.println("Car 1"); } public void m2(){ System.out.println("Car 2"); } public String toString(){ return "vroom"; } } class Truck extends Car{ public void m1() { System.out.println("Truck 1"); } public String toString() { return super.toString() + super.toString(); } public void m3() { System.out.println("Only in truck"); } } public class Driver3{ public static void main(String [] args){ Car mycar; mycar = new Truck(); System.out.println(mycar); mycar.m1(); mycar.m2(); } }

		1)vroom Truck 1 Car 2
		2)The code is not valid.
		3)vroom Car 1 Car 2
		4)vroomvroom Truck 1 Car 2

QUESTION 5

What is the output of the following program?

class Car{ public void m1(){ System.out.println("Car 1"); } public void m2(){ System.out.println("Car 2"); } public String toString(){ return "vroom"; } } class Truck extends Car{ public void m1() { System.out.println("Truck 1"); } public String toString() { return super.toString() + super.toString(); } public void m3() { System.out.println("Only in truck"); } } public class Driver3{ public static void main(String [] args){ Truck mytruck; mytruck = new Truck(); System.out.println(mytruck); mytruck.m1(); mytruck.m2(); mytruck.m3(); } }

		1)The code is not valid.
		2)vroom Truck 1 Car 2 3Only in truck
		3)vroomvroom Truck 1 Car 2 Only in truck
		4)vroomvroom Truck 1 Only in truck

QUESTION 6

Given the following class declarations, and the variable declared in the main method, which of the following statements are valid as a continuation to the main method?

class Bay extends Lake { public void method1() { System.out.println("Bay 1"); } public void method2() { System.out.println("Bay 2"); } } class Pond { public void method1() { System.out.println("Pond 1"); } public void method2() { System.out.println("Pond 2"); } } class Ocean extends Bay { public void method2() { System.out.println("Ocean 2"); } } class Lake extends Pond { public void method3() { System.out.println("Lake 3"); } } public class Water { public static void main(String [] args) { Pond var1 = new Bay(); } }

		1)var1.method2();
		2)var1.method1();
		3)((Lake) var1).method1();
		4)((Bay) var1).method1();
		5)((Pond) var1).method1();
		6)((Ocean) var1).method1();

QUESTION 7

What is the output of the following program?

class Bay extends Lake { public void method1() { System.out.println("Bay 1"); } public void method2() { System.out.println("Bay 2"); } } class Pond { public void method1() { System.out.println("Pond 1"); } public void method2() { System.out.println("Pond 2"); } } class Ocean extends Bay { public void method2() { System.out.println("Ocean 2"); } } class Lake extends Pond { public void method3() { System.out.println("Lake 3"); } } public class Water { public static void main(String [] args) { Pond var1 = new Bay();

((Lake) var1).method1(); ((Bay) var1).method1(); ((Pond) var1).method1(); } }

		1)Bay 1 Pond 1 Pond 1
		2)Bay 1 Bay 1 Bay 1
		3)Pond 1 Bay 1 Pond 1
		4)Lake 1 Bay 1 Pond 1

QUESTION 8

Given the following class declarations, and the variable declared in the main method, which of the following statements are valid as a continuation to the main method? class Bay extends Lake { public void method1() { System.out.println("Bay 1"); } public void method2() { System.out.println("Bay 2"); } } class Pond { public void method1() { System.out.println("Pond 1"); } public void method2() { System.out.println("Pond 2"); } } class Ocean extends Bay { public void method2() { System.out.println("Ocean 2"); } } class Lake extends Pond { public void method3() { System.out.println("Lake 3"); } } public class Water { public static void main(String [] args) { Pond var2 = new Bay(); } }

		1)((Ocean) var2).method3();
		2)var2.method1();
		3)((Lake) var2).method2();
		4)var2.method3();
		5) var2.method2();
		6)((Pond) var2).method3();
		7)((Pond) var2).method2();