Question

Given a list of lists of Shapes organized in a grid, return the shape in the given row and column.? For two shapes, square and rectangle
public static Shape getShapeFromGrid(List<List<Shape>> grid, int r, int c) {

}

Return true if the shape in the given location is a Square and false otherwise.
public static boolean isSquare(List<List<Shape>> grid, int r, int c) {
return false;
}

public class Shape {
public double area() {
return 0;
}

public String toString() {
return "Shape base class";
}
}

Answer 1

CODE

public static Shape getShapeFromGrid(List<List<Shape>> grid, int r, int c) {

if (r >= grid.size() || c >= grid.get(r).size()) {

return null;

}

return grid.get(r).get(c);

}

public static boolean isSquare(List<List<Shape>> grid, int r, int c) {

if (r >= grid.size() || c >= grid.get(r).size()) {

return false;

}

Shape s = grid.get(r).get(c);

return s.getLength() == s.getWidth();

}

NOTE: Since you have not provided the full definition of Shape class, I have the provide the implementation of isSquare() assuming that Shape class has functions getLength() and getWidth(),