把计算器完善完了

test/GUItest/src/Calculator/MyFrame.java

@@ -4,7 +4,10 @@ import java.awt.Button;
 import java.awt.Dialog;
 import java.awt.FlowLayout;
 import java.awt.Frame;
+import java.awt.GridBagLayout;
+import java.awt.GridLayout;
 import java.awt.Label;
+import java.awt.Panel;
 import java.awt.TextField;
 import java.awt.event.ActionEvent;
 import java.awt.event.ActionListener;
@@ -24,12 +27,14 @@ public class MyFrame extends Frame {
         setVisible(true);
         setBounds(400, 400, 300, 200);
         TextField num1 = new TextField();
+        Label addKey = new Label("+");
         TextField num2 = new TextField();
         Button equal2 = new Button("=");
         TextField goal = new TextField();
         setLayout(new FlowLayout());
         setResizable(false);
         add(num1);
+        add(addKey);
         add(num2);
         add(equal2);
         add(goal);
@@ -52,29 +57,43 @@ public class MyFrame extends Frame {
     }
 
     public void CreateWarning(TextField num1, TextField num2, TextField goal) {
-        Dialog warning = new Dialog(this, "please enter a valid number! ");
-        warning.setLayout(new FlowLayout());
-        Button close = new Button("close");
-        close.addActionListener(new ActionListener() {
-            @Override
-            public void actionPerformed(ActionEvent e) {
-                // TODO Auto-generated method stub
-                warning.dispose();
-            }
-        });
-        warning.setSize(400, 0);
+        Dialog warning = new Dialog(this, "warning!");
+        warning.setLayout(new GridLayout(2, 1));
+        warning.setSize(400, 200);
         warning.setVisible(true);
         warning.addWindowListener(new WindowAdapter() {
             @Override
             public void windowClosing(WindowEvent e) {
                 // TODO Auto-generated method stub
                 warning.dispose();
-            }
-        });
                 num1.setText("");
                 num2.setText("");
                 goal.setText("");
             }
+        });
+
+        Panel Message = new Panel(new FlowLayout());
+        Panel CloseButton = new Panel(new FlowLayout());
+
+        Button closeButton = new Button("close");
+        Label message = new Label("please enter a valid number!");
+
+        closeButton.addActionListener(new ActionListener() {
+            @Override
+            public void actionPerformed(ActionEvent e) {
+                // TODO Auto-generated method stub
+                warning.dispose();
+                num1.setText("");
+                num2.setText("");
+                goal.setText("");
+            }
+        });
+
+        Message.add(message);
+        CloseButton.add(closeButton);
+        warning.add(Message);
+        warning.add(CloseButton);
+    }
 
     public String add(double num1, double num2) {
         return String.valueOf(num1 + num2);