1 files changed, 44 insertions, 0 deletions
diff --git a/Master/Reference Architectures and Patterns/hjp5/examples/Calculator.java b/Master/Reference Architectures and Patterns/hjp5/examples/Calculator.java
new file mode 100644
index 0000000..f23f923
--- /dev/null
+++ b/Master/Reference Architectures and Patterns/hjp5/examples/Calculator.java
@@ -0,0 +1,44 @@
+/* Calculator.java */
+
+import java.awt.*;
+import java.awt.event.*;
+
+public class Calculator
+extends Frame
+implements ActionListener
+{
+  private TextField tf;
+
+  public Calculator()
+  {
+    super("Calculator");
+    addWindowListener(new WindowClosingAdapter(true));
+    setBackground(Color.lightGray);
+    setLayout(new GridLayout(2, 1));
+    tf = new TextField("777");
+    add(tf);
+    Panel p = new Panel();
+    for (int i = 1; i <= 1000; i *= 10) {
+      Button b = new Button("+" + i);
+      b.addActionListener(this);
+      p.add(b);
+    }
+    add(p);
+  }
+
+  public void actionPerformed(ActionEvent event)
+  {
+    String cmd = event.getActionCommand();
+    int n1 = Integer.parseInt(tf.getText());
+    int n2 = Integer.parseInt(cmd.substring(1));
+    tf.setText("" + (n1 + n2));
+  }
+
+  public static void main(String[] args)
+  {
+    Calculator calc = new Calculator();
+    calc.setLocation(100, 100);
+    calc.setSize(200, 85);
+    calc.setVisible(true);
+  }
+}
+\ No newline at end of file