Error in Learning Java by Kathy Sierra and Bert Bates

Good afternoon everyone. In between work and JavaRush, I bought and started reading “ Learning Java ” by Kathy Sierra and Bert Bates. Today I did another homework assignment in the textbook. I couldn't solve the problem " class Triangle " p. 95. In IntelliJ IDEA the answer was not what I needed. I spent two hours, tried all possible options, nothing worked. He spat and went for the answers. And there is my very first decision. As a result, if you enter this code into IntelliJ IDEA, the answer will not be the one written in the textbook. Error in textbook

The correct solution from the answers looks like this:


public class Triangle
{
    double area;
    int height;
    int lenght;
    public static void main(String[] args)
    {
        int x = 0;
        Triangle [] ta = new Triangle[4];
        while (x < 4)
        {
            ta[x] = new Triangle();
            ta[x].height = (x + 1) * 2;
            ta[x].lenght = x + 4;
            ta[x].setArea();
            System.out.print("треугольник " +x+ ", зона");
            System.out.println(" = " + ta[x].area);
            x = x + 1;
        }
        int y = x;
        x = 27;
        Triangle t5 = ta[2];
        ta[2].area = 343;
        System.out.print("y = " + y);
        System.out.println(", зона t5 = " + t5.area);
    }
    void setArea()
    {
        area = (height + lenght) / 2;
    }
}

The answer, according to the authors of the textbook, should be:


треугольник 0, зона = 4.0
треугольник 1, зона = 10.0
треугольник 2, зона = 18.0
треугольник 3, зона = 28.0
y = 4, зона t5 = 343.0

In reality the answer looks like this:


треугольник 0, зона = 3.0
треугольник 1, зона = 4.0
треугольник 2, зона = 6.0
треугольник 3, зона = 7.0
y = 4, зона t5 = 343.0