diff --git a/src/java2022spring/Calculator.java b/src/java2022spring/Calculator.java
new file mode 100644
index 0000000000000000000000000000000000000000..62c417112d17437f8a5157b40188b335f728ac47
Binary files /dev/null and b/src/java2022spring/Calculator.java differ
diff --git a/src/java2022spring/Test.java b/src/java2022spring/Test.java
index 24deb29bfc0e5f50fdedcd21b504e77b529d48b6..b77de6c34087527b3db25d8ebd4ca8895a4dd282 100644
--- a/src/java2022spring/Test.java
+++ b/src/java2022spring/Test.java
@@ -2,6 +2,7 @@ package java2022spring;
 
 public class Test {
 	public static void main(String[] args) {
-		System.out.println("Hello world!");
+		Calculator calculator=new Calculator();
+		calculator.setVisible(true);
 	}
 }