diff --git a/hw5.staticvariable b/hw5.staticvariable
new file mode 100644
index 0000000..56745d2
--- /dev/null
+++ b/hw5.staticvariable
@@ -0,0 +1,57 @@
+package StaticVarMethod;
+
+import java.util.List;
+import java.util.ArrayList;
+
+public class Rectangle {
+    public static void main(String[] args) {
+    }
+    public int mLength;
+    public int mWidth;
+    public static List<Rectangle> instances = new ArrayList<Rectangle>();
+
+    public Rectangle(int length, int width) {
+        mLength = length;
+        mWidth = width;
+        instances.add(this);
+    }
+    public int getmLength() {
+        return mLength;
+    }
+    public int getmWidth() {
+        return mWidth;
+    }
+    public boolean isSquare() {
+        return mLength == mWidth;
+    }
+    public int area() {
+        return mLength * mWidth;
+    }
+    public static List<Rectangle> all() {
+        return instances;
+    }
+    static class Square {        //nested class
+        int length = 15;
+        int width = 15;
+        int getTotalSize() {
+            return length * width;
+        }
+        public static void main(String[] args) {
+            Rectangle rc = new Rectangle(15, 15);
+            System.out.println("Rectangle : " + rc.isSquare());
+        }
+        static class Loop {     //loop
+            public static void main(String[] args) {
+                for (int length = 1; length <= 10; ++length) {
+                    System.out.println("Line " + length);
+                for (int width =1; width<=10; ++width);
+                }
+            class WhileLoop {
+                    public void main(String[] args) {
+                        int length = 1;
+                        while (length <= 10) {
+                            System.out.println("Line " + length);
+                            ++length;
+                        }
+                    }}}}}}
+