修改项目目录

src/chapter2/Example20.java

@@ -0,0 +1,13 @@
+package chapter2;
+
+public class Example20 {
+    public static void main(String[] args) {
+        int area = getArea(3, 5);
+        System.out.println("The area is " + area);
+    }
+
+    public static int getArea(int x, int y) {
+        int temp = x * y;
+        return temp;
+    }
+}