diff --git a/.idea/.gitignore b/.idea/.gitignore
new file mode 100644
index 0000000..359bb53
--- /dev/null
+++ b/.idea/.gitignore
@@ -0,0 +1,3 @@
+# 默认忽略的文件
+/shelf/
+/workspace.xml
diff --git a/.idea/misc.xml b/.idea/misc.xml
new file mode 100644
index 0000000..0548357
--- /dev/null
+++ b/.idea/misc.xml
@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ProjectRootManager" version="2" languageLevel="JDK_1_8" default="true" project-jdk-name="1.8" project-jdk-type="JavaSDK">
+    <output url="file://$PROJECT_DIR$/out" />
+  </component>
+</project>
\ No newline at end of file
diff --git a/.idea/modules.xml b/.idea/modules.xml
new file mode 100644
index 0000000..a75e6a5
--- /dev/null
+++ b/.idea/modules.xml
@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ProjectModuleManager">
+    <modules>
+      <module fileurl="file://$PROJECT_DIR$/lesson2.iml" filepath="$PROJECT_DIR$/lesson2.iml" />
+    </modules>
+  </component>
+</project>
\ No newline at end of file
diff --git a/.idea/vcs.xml b/.idea/vcs.xml
new file mode 100644
index 0000000..35eb1dd
--- /dev/null
+++ b/.idea/vcs.xml
@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="VcsDirectoryMappings">
+    <mapping directory="" vcs="Git" />
+  </component>
+</project>
\ No newline at end of file
diff --git a/Calculator.java b/Calculator.java
index cf17971..03441f0 100644
--- a/Calculator.java
+++ b/Calculator.java
@@ -9,7 +9,6 @@ import javax.script.ScriptException;
 public class Calculator extends JFrame implements ActionListener {
     private JTextField display;
     private StringBuilder input;
-
     public Calculator() {
         input = new StringBuilder();
         display = new JTextField();
@@ -20,14 +19,12 @@ public class Calculator extends JFrame implements ActionListener {
         JPanel panel = new JPanel();
         panel.setLayout(new GridLayout(4, 4, 10, 10));
         panel.setBackground(Color.GRAY);
-
         String[] buttons = {
                 "7", "8", "9", "/",
                 "4", "5", "6", "*",
                 "1", "2", "3", "-",
                 "C", "0", "=", "+"
         };
-
         for (String text : buttons) {
             JButton button = new JButton(text);
             button.setFont(new Font("Arial", Font.PLAIN, 24));
@@ -35,7 +32,6 @@ public class Calculator extends JFrame implements ActionListener {
             button.setBackground(Color.WHITE);
             panel.add(button);
         }
-
         add(display, BorderLayout.NORTH);
         add(panel, BorderLayout.CENTER);
         setTitle("Calculator");
@@ -63,12 +59,10 @@ public class Calculator extends JFrame implements ActionListener {
             display.setText(input.toString());
         }
     }
-
     private double evaluate(String expression) throws ScriptException {
         ScriptEngine engine = new ScriptEngineManager().getEngineByName("JavaScript");
         return ((Number) engine.eval(expression)).doubleValue();
     }
-//11122222
     public static void main(String[] args) {
         SwingUtilities.invokeLater(() -> {
             Calculator calculator = new Calculator();
diff --git a/lesson2.iml b/lesson2.iml
new file mode 100644
index 0000000..b107a2d
--- /dev/null
+++ b/lesson2.iml
@@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<module type="JAVA_MODULE" version="4">
+  <component name="NewModuleRootManager" inherit-compiler-output="true">
+    <exclude-output />
+    <content url="file://$MODULE_DIR$">
+      <sourceFolder url="file://$MODULE_DIR$" isTestSource="false" />
+    </content>
+    <orderEntry type="inheritedJdk" />
+    <orderEntry type="sourceFolder" forTests="false" />
+  </component>
+</module>
\ No newline at end of file