We are given the following interface “Movable”
Based on the Movable interface, we create three classes: Car, Plane, and Ship that implement it. After that, we create a program that will similarly process an array of movable. we implement data structures to make the three classes to either move forward/backward or left/right.
package lab4;
public class movable {
public interface Movable {
public void moveForward();
public void moveForward(int x);
public void moveBackward();
public void moveBackward(int x);
public void moveLeft();
public void moveLeft(int y);
public void moveRight();
public void moveRight(int y);
public void displayCoordinates();
}
}
package lab4;
import java.util.Scanner;
import lab4.movable.Movable;
public class MovableApp {
static Movable a;
private static Scanner input;
private static Scanner input2;
private static Scanner input3;
public static void main(String[] args) {
System.out.println("Please select an option:");
System.out.println("1. Car");
System.out.println("2. Plane");
System.out.println("3. Ship");
System.out.println("4. Exit");
int option = getMenuInput();
System.out.println("Option selected: "+ option);
a = createObjects(option);
a.displayCoordinates();
do{
System.out.println("Please select");
System.out.println("1. moveForward");
System.out.println("2. moveForward(n)");
System.out.println("3. moveBackward");
System.out.println("4. moveBackward(n)");
System.out.println("5. moveLeft");
System.out.println("6. moveLeft(n)");
System.out.println("7. moveRight");
System.out.println("8. moveRight(n)");
System.out.println("9. exit");
int option1 = getMoveInput();
performAction(option1);
a.displayCoordinates();
System.out.println("\n");
}while(true);
}
static Movable createObjects(int option){
Movable a = null ;
switch (option) {
case 1:
a = new car();
break;
case 2:
a = new plane();
break;
case 3:
a = new ship();
break;
}
return a;
}
static void performAction(int option){
int n =0;
switch (option) {
case 1:
a.moveForward();
break;
case 2:
n = getN();
a.moveForward(n);
break;
case 3:
a.moveBackward();
break;
case 4:
n = getN();
a.moveBackward(n);
break;
case 5:
a.moveLeft();
break;
case 6:
n = getN();
a.moveLeft(n);
break;
case 7:
a.moveRight();
break;
case 8:
n = getN();
a.moveRight(n);
break;
case 9:
System.exit(0);
}
}
static int getN(){
System.out.println("Please n number of steps to move: ");
input = new Scanner(System.in);
return Integer.parseInt(input.nextLine());
}
static int getMenuInput() {
int option = 0;
boolean inputError = true;
input2 = new Scanner(System.in);
do {
try {
option = Integer.parseInt(input2.nextLine());
if (option 4)
throw new Exception();
else
inputError = false;
} catch (Exception e) {
System.out.println("Error! Please enter valid number between 1 and 4");
input2.reset();
}
} while (inputError);
// Exit system if user choose exit
if ((option == 4)) System.exit(0);
return option;
}
static int getMoveInput() {
int option = 0;
boolean inputError = true;
input3 = new Scanner(System.in);
do {
try {
option = Integer.parseInt(input3.nextLine());
if (option 9)
throw new Exception();
else
inputError = false;
} catch (Exception e) {
System.out.println("Error! Please enter valid number between 1 and 9");
input3.reset();
}
} while (inputError);
// Exit system if user choose exit
if ((option == 9)) System.exit(0);
return option;
}
}
package lab4;
import lab4.movable.Movable;
public class car implements Movable {
int x;
int y;
public car() {
x =0;
y=0;
}
public car(int x, int y) {
this.x = x;
this.y = y;
}
@Override
public void moveForward() {
x++;
System.out.println("Moving "+toString()+" forward by X = 1");
}
@Override
public void moveForward(int c) {
x= x+c;
System.out.println("Moving "+toString()+" forward by X = "+c);
}
@Override
public void moveBackward() {
x--;
System.out.println("Moving "+toString()+" backward by X = -1");
}
@Override
public void moveBackward(int c) {
x=x-c;
System.out.println("Moving "+toString()+" backward by X = -"+c);
}
@Override
public void moveLeft() {
y--;
System.out.println("Moving "+toString()+" backward by Y = -1");
}
@Override
public void moveLeft(int c) {
y=y-c;
System.out.println("Moving "+toString()+" backward by Y = -"+c);
}
@Override
public void moveRight() {
y++;
System.out.println("Moving "+toString()+" backward by Y = 1");
}
@Override
public void moveRight(int c) {
y=y+c;
System.out.println("Moving "+toString()+" backward by Y = "+c);
}
@Override
public void displayCoordinates() {
System.out.println(toString()+"'s position X:"+x+ " Y:" +y);
}
@Override
public String toString(){
return "Car";
}
}
package lab4;
import lab4.movable.Movable;
public class plane implements Movable {
int x;
int y;
public plane() {
x =0;
y=0;
}
public plane(int x, int y) {
this.x = x;
this.y = y;
}
@Override
public void moveForward() {
x++;
System.out.println("Moving "+toString()+" forward by X = 1");
}
@Override
public void moveForward(int c) {
x= x+c;
System.out.println("Moving "+toString()+" forward by X = "+c);
}
@Override
public void moveBackward() {
x--;
System.out.println("Moving "+toString()+" backward by X = -1");
}
@Override
public void moveBackward(int c) {
x=x-c;
System.out.println("Moving "+toString()+" backward by X = -"+c);
}
@Override
public void moveLeft() {
y--;
System.out.println("Moving "+toString()+" backward by Y = -1");
}
@Override
public void moveLeft(int c) {
y=y-c;
System.out.println("Moving "+toString()+" backward by Y = -"+c);
}
@Override
public void moveRight() {
y++;
System.out.println("Moving "+toString()+" backward by Y = 1");
}
@Override
public void moveRight(int c) {
y=y+c;
System.out.println("Moving "+toString()+" backward by Y = "+c);
}
@Override
public void displayCoordinates() {
System.out.println(toString()+"'s position X:"+x+ " Y:" +y);
}
@Override
public String toString(){
return "Plane";
}
}
package lab4;
import lab4.movable.Movable;
public class ship implements Movable {
int x;
int y;
public ship() {
x=0;
y=0;
}
public ship(int x, int y) {
this.x = x;
this.y = y;
}
@Override
public void moveForward() {
x++;
System.out.println("Moving "+toString()+" forward by X = 1");
}
@Override
public void moveForward(int c) {
x= x+c;
System.out.println("Moving "+toString()+" forward by X = "+c);
}
@Override
public void moveBackward() {
x--;
System.out.println("Moving "+toString()+" backward by X = -1");
}
@Override
public void moveBackward(int c) {
x=x-c;
System.out.println("Moving "+toString()+" backward by X = -"+c);
}
@Override
public void moveLeft() {
y--;
System.out.println("Moving "+toString()+" backward by Y = -1");
}
@Override
public void moveLeft(int c) {
y=y-c;
System.out.println("Moving "+toString()+" backward by Y = -"+c);
}
@Override
public void moveRight() {
y++;
System.out.println("Moving "+toString()+" backward by Y = 1");
}
@Override
public void moveRight(int c) {
y=y+c;
System.out.println("Moving "+toString()+" backward by Y = "+c);
}
@Override
public void displayCoordinates() {
System.out.println(toString()+"'s position X:"+x+ " Y:" +y);
}
@Override
public String toString(){
return "Ship";
}
}
