If I have an array of a class type (cars) and each car has been given a make and model using set methods, how can I then print out the make and model of a particular element? I need to print this out in a separate class
public class Car {
private String make;
private String model;
public void setMake (String str1) {
make = str1;
}
public void setModel (String str2) {
model = str2;
}
You need to add a toString()
method to your class
public class Car {
private String make;
private String model;
public void setMake (String str1) {
make = str1;
}
public void setModel (String str2) {
model = str2;
}
@Override
public String toString() {
return "Make :"+ make + " Model :" + model;
}
}
You can then use this as follows
public static void main(String[] args){
Car car=new Car();
car.setMake("Audi");
car.setModel("ModelName");
System.out.println(car);
}
Equally if this exists in an array of cars (I'm using the constructor I introduce in the notes for brevity)
public static void main(String[] args){
Car[] cars=new Car[3];
cars[0]=new Car("Audi","ModelName");
cars[1]=new Car("BMW","ModelName");
cars[2]=new Car("Honda","ModelName");
for(int i=0;i<cars.length;i++){
System.out.println(cars[i]);
}
}
public static void main(String[] args){
Car[] cars=new Car[3];
cars[0]=new Car("Audi","ModelName");
cars[1]=new Car("BMW","ModelName");
cars[2]=new Car("Honda","ModelName");
Scanner scan=new Scanner(System.in);
System.out.println("Select index to print, should be between 0 and " + (cars.length-1));
//checks that user actually inputs an integer,
//checking its in range is left as an excercise
while (scan.hasNextInt()==false){
scan.next(); //consume bad input
System.out.println("Select index to print, should be between 0 and " + (cars.length-1));
}
int index=scan.nextInt();
System.out.println(cars[index]);
}
It seems like the make and model are essential to the workings of the car class, consider changing your constructor to take them as arguments
public Car(String make, String model){
this.make=make;
this.model=model;
}
All this assumes you already have the element you wish to print
class Car{
String make ;
String model;
@Override
public String toString() {
return "make :"+ this.make + " model :" + this.model;
}
}
List<Car> list= new ArrayList<Car>();
Car c1=new Car();
Car c2=new Car();
Car c3=new Car();
Car c4=new Car();
list.add(c1);
list.add(c2);
list.add(c3);
list.add(c4);
for(Car car : list)
{
System.out.println(car);
}
Try this
private static String toString(sample[] carTypes)
{
StringBuilder stringBuilder = new StringBuilder();
for (int i = 0; i < carTypes.length; i++)
{
if (carTypes[i] != null)
{
stringBuilder.append(" Name : ");
stringBuilder.append(carTypes[i].name);
stringBuilder.append(",");
stringBuilder.append(" Model : ");
stringBuilder.append(carTypes[i].model);
stringBuilder.append(",");
}
}
return stringBuilder.toString().substring(0, stringBuilder.toString().length() - 1);
}
output :
Name : BMW, Model : Mark 3, Name : AUDI, Model : A-6, Name : BENZ, Model : BZ
public class Car {
private String make;
private String model;
public Car(String make, String model) {
this.make = make;
this.model = model;
}
public void setMake (String str1) {
make = str1;
}
public void setModel (String str2) {
model = str2;
}
public String getMake() {
return make;
}
public String getModel() {
return model;
}
}
public class PrintCars {
public static void main(String []args) {
Car cars[] = new Car[10];
// Assume you populate the array with Car objects here by code
cars[0] = new Car("make1", "model1");
for (Car carObj : cars) {
System.out.println(carObj.getmake());
System.out.println(carObj.getmodel());
}
}
}
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