Classes in own files

09_Battle/java/Sea.java

@@ -0,0 +1,57 @@
+class Sea {
+    private int tiles[];
+    private boolean hits[];
+
+    private int size;
+    public Sea(int make_size) {
+        size = make_size;
+        tiles = new int[size*size];
+    }
+
+    public int size() { return size; }
+
+    public String encodedDump() {
+        StringBuilder out = new StringBuilder();
+        for (int x = 0; x < size; ++x) {
+            for (int y = 0; y < size; ++y) 
+                out.append(Integer.toString(get(x, y)));
+            out.append('\n');
+        }
+        return out.toString();   
+    }
+
+    /* return true if x,y is in the sea and empty
+     * return false if x,y is occupied or is out of range
+     */
+    public boolean isEmpty(int x, int y) {
+        if ((x<0)||(x>=size)||(y<0)||(y>=size)) return false;
+        return (get(x,y) == 0);
+    }
+
+    /* return the ship number, or zero if no ship */
+    public int get(int x, int y) {
+        return tiles[index(x,y)];
+    }
+
+    public void set(int x, int y, int value) {
+        tiles[index(x, y)] = value;
+    }
+
+    public int shipHit(int x, int y) {
+        if (hits[index(x,y)]) return get(x, y);
+        else return 0;
+    }
+
+    public void recordHit(int x, int y) {
+        hits[index(x, y)] = true;
+    }
+
+    private int index(int x, int y) {
+        if ((x < 0) || (x >= size))
+            throw new ArrayIndexOutOfBoundsException("Program error: x cannot be " + x);
+        if ((y < 0) || (y >= size))
+            throw new ArrayIndexOutOfBoundsException("Program error: y cannot be " + y);
+
+        return y*size + x;
+    }
+}