diff --git a/GuiCalculator.java b/GuiCalculator.java
new file mode 100644
index 0000000000000000000000000000000000000000..5e7ec42bbbfe7c07b6935bd5f20b4f8da4a1a78a
--- /dev/null
+++ b/GuiCalculator.java
@@ -0,0 +1,184 @@
+//GuiCalculator.java
+
+package gitops.idegitplugin;
+
+import java.awt.BorderLayout;
+import java.awt.Dimension;
+import java.awt.Font;
+import java.awt.GridLayout;
+import java.awt.event.ActionEvent;
+import java.awt.event.ActionListener;
+import javax.swing.JButton;
+import javax.swing.JFrame;
+import javax.swing.JOptionPane;
+import javax.swing.JPanel;
+import javax.swing.JTextField;
+
+public class GuiCalculator {
+
+  public static void main(String[] args) {
+    CalculatorUI ui = new CalculatorUI("VSCode GitPlugin GuiCalculator");
+    ui.setVisible(true);
+    ui.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
+  }
+}
+
+class CalculatorUI extends JFrame {
+
+  private JTextField textField = new JTextField("0");
+
+  private JPanel panel = new JPanel(new GridLayout(5, 4));
+  private JButton bt11 = new JButton("7");
+  private JButton bt12 = new JButton("8");
+  private JButton bt13 = new JButton("9");
+  private JButton bt14 = new JButton("/");
+  private JButton bt21 = new JButton("4");
+  private JButton bt22 = new JButton("5");
+  private JButton bt23 = new JButton("6");
+  private JButton bt24 = new JButton("*");
+  private JButton bt31 = new JButton("1");
+  private JButton bt32 = new JButton("2");
+  private JButton bt33 = new JButton("3");
+  private JButton bt34 = new JButton("-");
+  private JButton bt41 = new JButton("0");
+  private JButton bt42 = new JButton(".");
+  private JButton bt43 = new JButton("=");
+  private JButton bt44 = new JButton("+");
+  private JButton bt51 = new JButton("%");
+  private JButton bt52 = new JButton("!");
+  private JButton bt53 = new JButton("~");
+  private JButton bt54 = new JButton("^");
+  JButton jb[] = {
+    bt11,
+    bt12,
+    bt13,
+    bt14,
+    bt21,
+    bt22,
+    bt23,
+    bt24,
+    bt31,
+    bt32,
+    bt33,
+    bt34,
+    bt41,
+    bt42,
+    bt43,
+    bt44,
+    bt51,
+    bt52,
+    bt53,
+    bt54,
+  };
+
+  class MyHandler implements ActionListener {
+
+    String str = "";
+
+    @Override
+    public void actionPerformed(ActionEvent e) {
+      JButton source = (JButton) e.getSource();
+
+      if (source == bt43) {
+        str = str + "= " + CalcString.getRes(str);
+        textField.setText(str);
+
+        int res = JOptionPane.showConfirmDialog(
+          panel,
+          "Calculated, Goon ?",
+          "",
+          JOptionPane.YES_NO_OPTION
+        );
+        if (res == JOptionPane.YES_OPTION) {
+          str = "";
+          textField.setText("0");
+        } else System.exit(0);
+      } else {
+        str = str + source.getText();
+        textField.setText(str);
+      }
+    }
+  }
+
+  public CalculatorUI(String title) {
+    super(title);
+    this.ComponentInit();
+    MyHandler myHandler = new MyHandler();
+    this.ListenerAdd(myHandler);
+    this.setLocation(300, 200);
+    this.setSize(600, 450);
+  }
+
+  private void ComponentInit() {
+    this.add(textField, BorderLayout.NORTH);
+    textField.setPreferredSize(new Dimension(300, 80));
+    textField.setHorizontalAlignment(JTextField.RIGHT);
+    textField.setFont(new Font("楷体", Font.PLAIN, 32));
+    textField.setEditable(false);
+
+    this.add(panel, BorderLayout.CENTER);
+    panel.setPreferredSize(new Dimension(300, 350));
+    for (int i = 0; i < 20; i++) {
+      jb[i].setFont(new Font("楷体", Font.BOLD, 32));
+      panel.add(jb[i]);
+    }
+  }
+
+  private void ListenerAdd(MyHandler myHandler) {
+    for (int i = 0; i < 20; i++) {
+      jb[i].addActionListener(myHandler);
+    }
+  }
+}
+
+class CalcString {
+
+  public static double getRes(String str) {
+    String s = "";
+    double n1 = 0, n2, res = 0;
+    char op = 0;
+
+    for (int i = 0; i < str.length(); i++) {
+      if (
+        str.charAt(i) != '+' &&
+        str.charAt(i) != '-' &&
+        str.charAt(i) != '*' &&
+        str.charAt(i) != '/' &&
+        str.charAt(i) != '%'
+      ) {
+        s = s + str.charAt(i);
+      } else {
+        n1 = Double.parseDouble(s);
+        op = str.charAt(i);
+        s = "";
+      }
+    }
+    n2 = Double.parseDouble(s);
+
+    switch (op) {
+      case '+':
+        res = n1 + n2;
+        break;
+      case '-':
+        res = n1 - n2;
+        break;
+      case '*':
+        res = n1 * n2;
+        break;
+      case '/':
+        if (0 == n2) {
+          System.out.println("Error:/0");
+          res = 0;//没有彻底解决除0问题
+          break;
+        }
+        res = n1 / n2;
+        break;
+      case '%':
+        res = (int) n1 % (int) n2;
+        break;
+      default:
+    }
+
+    return res;
+  }
+}