Help with get and set methods

[shroomiin]

Hey everyone. I am supposed to create a program that finds the area of a triangle...this i can do fine. My only problem is i was told that i need to use a get and set method to calculate the area. I dont exactly know how to use a get and set method with an object...would anybody show me how to do this or set me in the right direction? here is what i have, which works:

Main class:

public class TriMain {

	public static void main(String[] args) {
		
		TriObj myTriObj = new TriObj();
		
		myTriObj.runIt();
	
		

		
		
	}

}

Object:

import java.util.Scanner;
public class TriObj {
	
	public void runIt()
	{
		
		Scanner input = new Scanner (System.in);
		
		int base;
		int height;
		int area;

		
		System.out.println("Enter base of triange: ");
		base=input.nextInt();
		System.out.println("Enter height of triange: ");
		height=input.nextInt();
	
		area=(base*height/2);
	
		
		System.out.println("The area of the triangle is: "+ area);
		
		
	}

}

[sky]

I suppose that what you should do is declare base, height and area outside the method, that is, as fields of the object. Then you can have the accesor methods (get) and the mutator methods (set) like this:

public void setBase(int base) {
    this.base=base;
}

public int getArea() {
    return area;
}

... and so on. Therefore, I would recommend you to take out from TriObj the input reading and don't use set methods. You should read the input in the Main and after that create an object like this:

TriObj myTriObj = new TriObj(base, height);

using the constructor:

public Triobject(int base, int height) {
    this.base=base;
    this.height=height;
}

At the end it would be something like this (I didn't compile it so be careful):

import java.util.Scanner;

public class TriMain {

	public static void main(String[] args) {

                int base, height, area;
		Scanner input = new Scanner (System.in);
		
		System.out.println("Enter base of triange: ");
		base=input.nextInt();
		System.out.println("Enter height of triange: ");
		height=input.nextInt();

		TriObj myTriObj = new TriObj(base, height);

                area=myTriObj.getArea();
                System.out.println("The area of the triangle is: "+ area);

	}
}

public class TriObj {
	
	private int base;
        private int height;
        private int area;

	public Triobject(int base, int height) {
               this.base=base;
               this.height=height;
               this.area=(base*height/2);
         }
		
	public int getArea() {
               return area;
        }	
}

[Singing Boyo]

Possibly you might also want a getHeight(), getBase(), and reCompute(int, int) method. (reCompute is going overboard, but hey, I like to be thorough)

public int getHeight(){
     return height;
}
public int getBase(){
     return base;
}
public void reCompute(int height, int base){
     this.base = base;
     this.height = height;
     this.area = base*height/2;
}

[sky]

Yes, I agree with Singing Boyo, but I only see useful the method reCompute() if you also define the methods setHeight() and setBase()

[Singing Boyo]

Yes, but then you need to do the re-computation in those methods to, or you end up with problems. Or you just change getArea to this...

public int getArea(){
     return base*height/2;
}