Selection Sort Sample Code

public class Turtle {
    private int height;
    
    public Turtle(int height) {
        this.height = height;
    }
    
    public int getHeight() {
        return height;
    }
}

public class SelectionSortTurtles {
    public static void main(String[] args) {
        Turtle[] turtles = new Turtle[7];
        turtles[0] = new Turtle(10);
        turtles[1] = new Turtle(5);
        turtles[2] = new Turtle(15);
        turtles[3] = new Turtle(8);
        turtles[4] = new Turtle(20);
        turtles[5] = new Turtle(12);
        turtles[6] = new Turtle(3);
        
        // perform selection sort by height
        for (int i = 0; i < turtles.length - 1; i++) {
            int minIndex = i;
            for (int j = i + 1; j < turtles.length; j++) {
                if (turtles[j].getHeight() < turtles[minIndex].getHeight()) {
                    minIndex = j;
                }
            }
            // swap the turtles at i and minIndex
            Turtle temp = turtles[i];
            turtles[i] = turtles[minIndex];
            turtles[minIndex] = temp;
        }
        
        // print the sorted turtles
        for (int i = 0; i < turtles.length; i++) {
            System.out.println("Turtle " + (i+1) + " height: " + turtles[i].getHeight());
        }
    }
}

SelectionSortTurtles.main(null);

Turtle 1 height: 3
Turtle 2 height: 5
Turtle 3 height: 8
Turtle 4 height: 10
Turtle 5 height: 12
Turtle 6 height: 15
Turtle 7 height: 20