diff --git a/src/main/java/no/uib/inf101/grid/CellPosIterator.java b/src/main/java/no/uib/inf101/grid/CellPosIterator.java
new file mode 100644
index 0000000000000000000000000000000000000000..88c5b095865dc2ac3c7ba2eb9c278eda531d43e5
--- /dev/null
+++ b/src/main/java/no/uib/inf101/grid/CellPosIterator.java
@@ -0,0 +1,35 @@
+package no.uib.inf101.grid;
+
+import java.util.Iterator;
+
+public class CellPosIterator implements Iterator<CellPosition>{
+
+ int rows;
+ int cols;
+ int curRow;
+ int curCol;
+
+ public CellPosIterator(int rows, int cols) {
+ this.rows=rows;
+ this.cols = cols;
+ curRow=0;
+ curCol=0;
+ }
+
+ @Override
+ public boolean hasNext() {
+ return curRow<rows && curCol<cols;
+ }
+
+ @Override
+ public CellPosition next() {
+ CellPosition pos = new CellPosition(curRow, curCol);
+ curRow++;
+ if(curRow>=rows) {
+ curRow=0;
+ curCol++;
+ }
+ return pos;
+ }
+
+}
diff --git a/src/main/java/no/uib/inf101/grid/CellPosition.java b/src/main/java/no/uib/inf101/grid/CellPosition.java
new file mode 100644
index 0000000000000000000000000000000000000000..1cab7c3750aaf0edaf628b7bd2c2bd52b8623dd0
--- /dev/null
+++ b/src/main/java/no/uib/inf101/grid/CellPosition.java
@@ -0,0 +1,5 @@
+package no.uib.inf101.grid;
+
+public record CellPosition(int row, int col) {
+
+}
diff --git a/src/main/java/no/uib/inf101/grid/Grid.java b/src/main/java/no/uib/inf101/grid/Grid.java
new file mode 100644
index 0000000000000000000000000000000000000000..d289df6e96b02c6f7013479222254f29c8da454b
--- /dev/null
+++ b/src/main/java/no/uib/inf101/grid/Grid.java
@@ -0,0 +1,89 @@
+package no.uib.inf101.grid;
+
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.Iterator;
+
+public class Grid implements IGrid {
+
+ @Override
+ public Iterator<GridCell> iterator() {
+ ArrayList<GridCell> cells = new ArrayList<>();
+ for(int row=0; row<rows(); row++) {
+ for(int col=0; col<cols; col++) {
+ CellPosition pos = new CellPosition(row, col);
+ cells.add(new GridCell(pos, get(pos)));
+ }
+ }
+ return cells.iterator();
+ }
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+ private int rows;
+ private int cols;
+
+ HashMap<CellPosition,Character> map;
+
+ public Grid(int rows, int cols) {
+ this.rows = rows;
+ this.cols = cols;
+ map = new HashMap<>();
+ }
+
+ public Grid(int rows, int cols, Character defaultValue) {
+ this(rows,cols);
+ fill(defaultValue);
+ }
+
+ private void fill(Character defaultValue) {
+ CellPosIterator posIter = new CellPosIterator(rows, cols);
+ while(posIter.hasNext()) {
+ set(posIter.next(),defaultValue);
+ }
+ }
+
+ @Override
+ public int rows() {
+ return rows;
+ }
+
+ @Override
+ public int cols() {
+ return cols;
+ }
+
+ @Override
+ public void set(CellPosition pos, Character symbol) {
+ map.put(pos, symbol);
+ }
+
+ @Override
+ public Character get(CellPosition pos) {
+ if(!positionIsOnGrid(pos))
+ throw new IndexOutOfBoundsException("Position must be on the grid");
+ return map.get(pos);
+ }
+
+ @Override
+ public boolean positionIsOnGrid(CellPosition pos) {
+ if(pos==null)
+ return false;
+ if(pos.row()<0 || pos.row()>=rows)
+ return false;
+ if(pos.col()<0 || pos.col()>=cols)
+ return false;
+ return true;
+ }
+}
diff --git a/src/main/java/no/uib/inf101/grid/GridCell.java b/src/main/java/no/uib/inf101/grid/GridCell.java
new file mode 100644
index 0000000000000000000000000000000000000000..37873f7dd1b466b162d9bf9d7be5110070a26a9d
--- /dev/null
+++ b/src/main/java/no/uib/inf101/grid/GridCell.java
@@ -0,0 +1,5 @@
+package no.uib.inf101.grid;
+
+public record GridCell(CellPosition pos, Character symbol) {
+
+}
diff --git a/src/main/java/no/uib/inf101/grid/GridCellIterator.java b/src/main/java/no/uib/inf101/grid/GridCellIterator.java
new file mode 100644
index 0000000000000000000000000000000000000000..0f9b423e20880f366d1c83bce17e9383d9e34c77
--- /dev/null
+++ b/src/main/java/no/uib/inf101/grid/GridCellIterator.java
@@ -0,0 +1,26 @@
+package no.uib.inf101.grid;
+
+import java.util.Iterator;
+
+public class GridCellIterator implements Iterator<GridCell> {
+
+ IGrid grid;
+ CellPosIterator positionsIter;
+
+ public GridCellIterator(Grid grid) {
+ this.grid = grid;
+ positionsIter = new CellPosIterator(grid.rows(),grid.cols());
+ }
+
+ @Override
+ public boolean hasNext() {
+ return positionsIter.hasNext();
+ }
+
+ @Override
+ public GridCell next() {
+ CellPosition pos = positionsIter.next();
+ return new GridCell(pos, grid.get(pos));
+ }
+
+}
diff --git a/src/main/java/no/uib/inf101/grid/GridDimension.java b/src/main/java/no/uib/inf101/grid/GridDimension.java
new file mode 100644
index 0000000000000000000000000000000000000000..25ab31f73dd532dfa268b05581694b14558f029d
--- /dev/null
+++ b/src/main/java/no/uib/inf101/grid/GridDimension.java
@@ -0,0 +1,11 @@
+package no.uib.inf101.grid;
+
+public interface GridDimension {
+
+ /** Number of rows in the grid */
+ int rows();
+
+ /** Number of columns in the grid */
+ int cols();
+
+}
diff --git a/src/main/java/no/uib/inf101/grid/IGrid.java b/src/main/java/no/uib/inf101/grid/IGrid.java
new file mode 100644
index 0000000000000000000000000000000000000000..8e0f9c885e339c088dd2ef02025f9b7410653334
--- /dev/null
+++ b/src/main/java/no/uib/inf101/grid/IGrid.java
@@ -0,0 +1,32 @@
+package no.uib.inf101.grid;
+
+public interface IGrid extends GridDimension, Iterable<GridCell> {
+
+ /**
+ * Sets the value of a position in the grid. A subsequent call to {@link #get}
+ * with an equal position as argument will return the value which was set. The
+ * method will overwrite any previous value that was stored at the location.
+ *
+ * @param pos the position in which to store the value
+ * @param symbol the new value
+ * @throws IndexOutOfBoundsException if the position does not exist in the grid
+ */
+ void set(CellPosition pos, Character symbol);
+
+ /**
+ * Gets the current value at the given coordinate.
+ *
+ * @param pos the position to get
+ * @return the value stored at the position
+ * @throws IndexOutOfBoundsException if the position does not exist in the grid
+ */
+ Character get(CellPosition pos);
+
+ /**
+ * Reports whether the position is within bounds for this grid
+ *
+ * @param pos position to check
+ * @return true if the coordinate is within bounds, false otherwise
+ */
+ boolean positionIsOnGrid(CellPosition pos);
+}