maven compiles all tests independetly of which tests are run

src/main/java/oving5/stringgrid/StringGrid.java

@@ -0,0 +1,23 @@
+package oving5.stringgrid;
+
+/**
+ * An interface with methods for managing the content of a String grid. The grid has a number of
+ * rows (the grid's height) and columns (the grid's width). In each cell in the grid there is a
+ * String that can be set with the setElement method and read with the getElement method.
+ */
+public interface StringGrid {
+
+    // Returns the number of rows in this StringGrid
+    int getRowCount();
+
+    // Returns the number of columns in this StringGrid
+    int getColumnCount();
+
+    // Returns the String at the given row and column. Throws an IllegalArgumentException if the
+    // row or column is out of range
+    String getElement(int row, int column);
+
+    // Sets the String at the given row and column. Throws an IllegalArgumentException if the row
+    // or column is out of range
+    void setElement(int row, int column, String element);
+}

src/main/java/oving5/stringgrid/StringGridImpl.java

@@ -0,0 +1,55 @@
+package oving5.stringgrid;
+
+import java.util.ArrayList;
+import java.util.Collections;
+
+public class StringGridImpl implements StringGrid {
+	private ArrayList<String> grid;
+	private int rows;
+	private int columns;
+
+	StringGridImpl(int rows, int columns) {
+		grid = new ArrayList<String>(Collections.nCopies(rows * columns, ""));
+		this.rows = rows;
+		this.columns = columns;
+	}
+
+	public int getRowCount() {
+		return rows;
+	}
+
+	public int getColumnCount() {
+		return columns;
+	}
+
+	public String getElement(int row, int column) {
+		if (row < 0 || row >= rows || column < 0 || column >= columns) {
+			throw new IllegalArgumentException(
+					"Invalid value for row or column, got row: " + row + ", and column: " + column);
+		}
+		return grid.get(row * columns + column);
+	}
+
+	public void setElement(int row, int column, String element) {
+		if (row < 0 || row >= rows || column < 0 || column >= columns) {
+			throw new IllegalArgumentException(
+					"Invalid value for row or column, got row: " + row + ", and column: " + column);
+		}
+		grid.set(row * columns + column, element);
+	}
+
+	@Override
+	public String toString() {
+		String r = "";
+		for (int y = 0; y < rows; y++) {
+			for (int x = 0; x < columns; x++) {
+				r += grid.get(y * columns + x);
+				if (x < columns - 1) {
+					r += " | ";
+				}
+			}
+			r += "\n";
+		}
+		return r;
+	}
+}

src/main/java/oving5/stringgrid/StringGridIterator.java

@@ -0,0 +1,35 @@
+package oving5.stringgrid;
+
+public class StringGridIterator {
+	private StringGrid grid;
+	private boolean rowMajor;
+	private int i = -1;
+
+	public StringGridIterator(StringGrid grid, boolean rowMajor) {
+		this.grid = grid;
+		this.rowMajor = rowMajor;
+	}
+
+	public boolean hasNext() {
+		return (i + 1) < (grid.getRowCount() * grid.getColumnCount());
+	}
+
+
+
+	public String next() {
+		if (hasNext()) {
+			i += 1;
+			if (rowMajor) {
+				return grid.getElement(i / grid.getColumnCount(), i % grid.getColumnCount());
+			} else {
+				return grid.getElement(i % grid.getRowCount(), i / grid.getRowCount());
+			}
+		}
+		throw new IllegalArgumentException();
+	}
+
+	public void remove() {
+		throw new UnsupportedOperationException();
+	}
+
+}