so far this is what ive done, but I dont know how to generate the unique id


public class Customer{

private int id;
private String name;
private int childSeats;
private int adultSeats;
private int numFlights;
private double cost;

public Customer(){

} THIS IS WHAT IM STUCK ON

public int getAdultSeats(){
return adultSeats;
}
public void setAdultSeats(int adultSeats){
this.adultSeats = adultSeats;
}
public int getChildSeats(){
return childSeats;
}
public void setChildSeats(int childSeats){
this.childSeats=childSeats;
}
public double getCost(){
return cost;
}
public void setCost(double cost){
this.cost = cost;
}
public int getId(){
return id;
}
public void setId(int id){
this.id=id;
}
public String getName(){
return name;
}
public void setName(String name){
this.name=name;
}
public int getNumFlights(){
return numFlights;
}
public void setNumFlights(int numFlights){
this.numFlights=numFlights;
}
public String toString()
{
final String TAB = " ";
String retValue ="";
retValue = "Customer ("
+super.toString()+ TAB
+ "id=" + this.id + TAB
+ "name =" + this.name + TAB
+ "childSeats="+ this.childSeats + TAB
+ "adultSeats="+ this.adultSeats + TAB
+ "numFlights=" +this.numFlights + TAB
+ "cost=" +this.cost + TAB
+ ")";
return retValue;

}
}

Nice class. Try this:

public class Customer {
	private static int lastId=0;
	
	public Customer() {
		this.id = ++Customer.lastId;
	}
}

This requires an understanding of static. When java sees the class for the first time, lastId will be zero. The value exists in the class, not in each of the objects, so in a sense it's global. When you create an instance, that "global" value is incremented, used, and maintained.

For a quick check, try something like

System.out.println(new Customer());
System.out.println(new Customer());
System.out.println(new Customer());

Hope this helps.

Thank you so much baavgai. That worked im so happy. How do you stop the package name and all that from printing out? do you know. But thanks for the time taken to reply. you've made my day.

Take care