返回x参数匿名对象

Question

In Java, sometimes I need to return a struct variable like Point(x,y). However, I only use this result in 1 place of the code and 1 time. So it seems excessive to declare a class called Point. Is there a way to return some kind of anonymous object with x number of parameters?

Answer 1

You can return an ArrayList , but then the problem is, an ArrayList is bound to one specific type, so if those parameters have different types, you have to typecast them. In your example, x and y are of type int or double I guess, but still.

If you want some 'anonymous' class, it still needs a class signature. You might want to make Point as an innerclass, something like this:

public class SomeClass {
    class Point {
        private int x;
        private int y;
        public Point(int x, int y) {
            this.x = x;
            this.y = y;
        }
    }

    private Point p;
}

Why nested classes? The Java™ Tutorials Point out why.

Answer 2

You can return Array or ArrayList .

int[] GetPoint( ... )
{
    int[] arr = null;
    // ...
    // Find length (say len)

    arr = new int[len];

    // Business logic
    // ...

    return arr;
}