course2 paint method

src/com/demo/tank/coruse1/FrameTest.java

@@ -0,0 +1,21 @@
+package com.demo.tank.coruse1;
+
+import java.awt.*;
+import java.awt.event.WindowAdapter;
+import java.awt.event.WindowEvent;
+
+public class FrameTest {
+    public static void main(String[] args) {
+        Frame frame = new Frame();
+        frame.setVisible(true);
+        frame.setSize(800, 600);
+        frame.setResizable(false);
+        frame.setTitle("tank war");
+        frame.addWindowListener(new WindowAdapter() {
+            @Override
+            public void windowClosing(WindowEvent e) {
+                System.exit(0);
+            }
+        });
+    }
+}

src/com/demo/tank/coruse2/Main.java

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+package com.demo.tank.coruse2;
+
+public class Main {
+    public static void main(String[] args) {
+        new TankFrame();
+    }
+}

src/com/demo/tank/coruse2/TankFrame.java

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+package com.demo.tank.coruse2;
+
+import java.awt.*;
+import java.awt.event.WindowAdapter;
+import java.awt.event.WindowEvent;
+
+public class TankFrame extends Frame {
+    int x = 200, y = 200;
+    public TankFrame(){
+        setVisible(true);
+        setSize(800, 600);
+        setResizable(false);
+        setTitle("tank war");
+        addWindowListener(new WindowAdapter() {
+            @Override
+            public void windowClosing(WindowEvent e) {
+                System.exit(0);
+            }
+        });
+    }
+
+    @Override
+    public void paint(Graphics g){
+        g.fillRect(x,y,50,50);
+    }
+}