Homework Answers
1) In Child Class Teacher.Since that is the only function in teacher.
2) Flying plane.Since the method is getting overriden in child class.
3) a)A Vehicle reference can be automatically converted to Boat reference.
d)A Boat reference can be automatically converted to Car reference.
Since both are implicit, as child class cannot be converted to parent class reference.
4) public void drive(){...}.Since Override methods are same.
5) c)line 4- drive() is not defined in class Object.
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What is output? public abstract class People { protected string name; protected int age; public abstract...
For Questions 1-3: consider the following code: public class A { private int number; protected String...
For Questions 1-3: consider the following code: public class A { private int number; protected String name; public double price; public A() { System.out.println(“A() called”); } private void foo1() { System.out.println(“A version of foo1() called”); } protected int foo2() { Sysem.out.println(“A version of foo2() called); return number; } public String foo3() { System.out.println(“A version of foo3() called”); Return “Hi”; } }//end class A public class B extends A { private char service; public B() { super(); System.out.println(“B() called”);...
For Questions 1-3: consider the following code: public class A { private int number; protected String...
For Questions 1-3: consider the following code: public class A { private int number; protected String name; public double price; public A() { System.out.println(“A() called”); } private void foo1() { System.out.println(“A version of foo1() called”); } protected int foo2() { Sysem.out.println(“A version of foo2() called); return number; } public String foo3() { System.out.println(“A version of foo3() called”); Return “Hi”; } }//end class A public class B extends A { private char service; public B() { super(); System.out.println(“B() called”); } public...
What is wrong with the following Java Code. public class TestEdible { abstract class Animal {...
What is wrong with the following Java Code. public class TestEdible { abstract class Animal { /** Return animal sound */ public abstract String sound(); } class Chicken extends Animal implements Edible { @Override public String howToEat() { return "Chicken: Fry it"; } @Override public String sound() { return "Chicken: cock-a-doodle-doo"; } } class Tiger extends Animal { @Override public String sound() { return "Tiger: RROOAARR"; } } abstract class Fruit implements Edible { // Data fields, constructors, and methods...
Analyze the following code: public class Test { public int x; public Test(String t) { System.out.println("Test");...
Analyze the following code: public class Test { public int x; public Test(String t) { System.out.println("Test"); public static void main(String[] args) { Test test: System.out.println(test.x); The program has a compile error because Test class does not have a default constructor The program has a compile error because test is not initialized OO The program has a compile error because x has not been initialized The program has a runtime NullPointerException while executing test.x because test is a null reference and...
class Upper { private int i; private String name; public Upper(int i){ name = "Upper"; this.i...
class Upper { private int i; private String name; public Upper(int i){ name = "Upper"; this.i = i;} public void set(Upper n){ i = n.show();} public int show(){return i;} } class Middle extends Upper { private int j; private String name; public Middle(int i){ super(i+1); name = "Middle"; this.j = i;} public void set(Upper n){ j = n.show();} public int show(){return j;} } class Lower extends Middle { private int i; private String name; public Lower(int i){ super(i+1); name =...
public class Animal { private String name; //line 1 private int weight; //line 2...
public class Animal { private String name; //line 1 private int weight; //line 2 private String getName(){ return name; } //line 3 public int fetchWeight(){ return weight; } //line 4 } public class Dog extends Animal { private String food; //line 5 public void mystery(){ //System.out.println("Name = " + name); //line 6 System.out.println("Food = " + food); //line 7 } } I want to know the super...
What is the output of this program? class A { public int i; private int j;...
What is the output of this program? class A { public int i; private int j; } class B extends A { void display() { super.j = super.i + 1; System.out.println(super.i + " " + super.j); } } class Inheritance { public static void main(String args[]) { B obj = new B(); obj.i=1; obj.j=2; obj.display(); } } Java language!! // include explanation!
The method m() of class B overrides the m() method of class A, true or false?...
The method m() of class B overrides the m() method of class A, true or false? class A int i; public void maint i) { this.is } } class B extends A{ public void m(Strings) { 1 Select one: True False For the following code, which statement is correct? public class Test { public static void main(String[] args) { Object al = new AC: Object a2 = new Object(); System.out.println(al); System.out.println(a): } } class A intx @Override public String toString()...
What is the output for the following program codes? a) [ 0.5 Mark ] class A...
What is the output for the following program codes? a) [ 0.5 Mark ] class A { int i; } class B extends A { int j; void display() { super.i = j + 1; System.out.println(j + " " + i); }} class inheritance { public static void main(String args[]) { B obj = new B(); obj.i=1; obj.j=2; obj.display(); }} OUTPUT: b) [ 0.5 Mark ] class Parent { public void getBike(){ System.out.println("Suzuki Bike"); }} class Child extends Parent {...
Point 3 4. Find the error, correct it and write output. public class Vehicle { private...
Point 3 4. Find the error, correct it and write output. public class Vehicle { private int wheels; private int mpg; publie Vehicle(int wh, int miles) { wheels = wh; mpg = miles; public String toString{ return ("Wheels: " + wheels +" Mpg:" + mpg); public class Car extends Vehicle { private static final int WHEELS = 4; public Car(int mpg) { public class MotorCycle extends Vehicle{ private static final int WHEELS = 2; public MotorCycle(int mpg) {
Analyze the following code: public class Test { public int x; public Test(String t) { System.out.println("Test"); public static void main(String[] args) { Test test: System.out.println(test.x); The program has a compile error because Test class does not have a default constructor The program has a compile error because test is not initialized OO The program has a compile error because x has not been initialized The program has a runtime NullPointerException while executing test.x because test is a null reference and...
The method m() of class B overrides the m() method of class A, true or false? class A int i; public void maint i) { this.is } } class B extends A{ public void m(Strings) { 1 Select one: True False For the following code, which statement is correct? public class Test { public static void main(String[] args) { Object al = new AC: Object a2 = new Object(); System.out.println(al); System.out.println(a): } } class A intx @Override public String toString()...
Point 3 4. Find the error, correct it and write output. public class Vehicle { private int wheels; private int mpg; publie Vehicle(int wh, int miles) { wheels = wh; mpg = miles; public String toString{ return ("Wheels: " + wheels +" Mpg:" + mpg); public class Car extends Vehicle { private static final int WHEELS = 4; public Car(int mpg) { public class MotorCycle extends Vehicle{ private static final int WHEELS = 2; public MotorCycle(int mpg) {
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