add demo for execution order of try catch finally

src/main/java/jvm/TryCatchDemo.java

@@ -0,0 +1,27 @@
+package main.java.jvm;
+
+/**
+ * in test method, x will assign to return value, here should be 1 (it will not throw any errors)
+ * then, the finally block will change x to 3, but the return value will not change
+ * How finally work is attach the code block in it to try block and catch block
+ */
+public class TryCatchDemo {
+
+    public int test() {
+        int x=0;
+        try {
+            x=1;
+            return x;
+        } catch (Exception e) {
+            x=2;
+            return x;
+        } finally {
+            x=3;
+        }
+    }
+
+    public static void main(String[] args) {
+        TryCatchDemo tryCatchDemo = new TryCatchDemo();
+        System.out.println(tryCatchDemo.test());
+    }
+}