尝试提交init

com/zetcode/Board.java

@@ -16,7 +16,7 @@ public class Board extends JPanel {
 
     private final int BOARD_WIDTH = 10;
     private final int BOARD_HEIGHT = 22;
-    private final int PERIOD_INTERVAL = 300;
+    private final int PERIOD_INTERVAL = 600;
 
     private Timer timer;
     private boolean isFallingFinished = false;

com/zetcode/Shape.java

@@ -64,9 +64,7 @@ public void setRandomShape() {
     }
 
     public int minX() {
-
         int m = coords[0][0];
-
         for (int i=0; i < 4; i++) {
 
             m = Math.min(m, coords[i][0]);

com/zetcode/Tetris.java

@@ -30,13 +30,12 @@ private void initUI() {
         board.start();
 
         setTitle("Tetris");
-        setSize(200, 400);
+        setSize(400, 800);
         setDefaultCloseOperation(EXIT_ON_CLOSE);
         setLocationRelativeTo(null);
     }
 
     JLabel getStatusBar() {
-
         return statusbar;
     }