Create QuitButtonEx.java

janbodnar · web-flow · commit 02837745896f · 2018-01-13T13:50:59.000+01:00
diff --git a/lambda/QuitButtonEx.java b/lambda/QuitButtonEx.java
@@ -0,0 +1,62 @@
+package com.zetcode;
+
+import java.awt.Container;
+import java.awt.EventQueue;
+import java.awt.event.ActionEvent;
+import java.awt.event.ActionListener;
+import javax.swing.GroupLayout;
+import javax.swing.JButton;
+import javax.swing.JComponent;
+import javax.swing.JFrame;
+
+public class QuitButtonEx extends JFrame {
+
+    public QuitButtonEx() {
+
+        initUI();
+    }
+
+    private void initUI() {
+
+        JButton quitButton = new JButton("Quit");
+        
+        quitButton.addActionListener(new ActionListener() {
+            @Override
+            public void actionPerformed(ActionEvent e) {
+                System.exit(0);
+            }
+        });        
+
+        createLayout(quitButton);
+
+        setTitle("Quit button");
+        setSize(300, 200);
+        setLocationRelativeTo(null);
+        setDefaultCloseOperation(EXIT_ON_CLOSE);
+    }
+
+    private void createLayout(JComponent... arg) {
+
+        Container pane = getContentPane();
+        GroupLayout gl = new GroupLayout(pane);
+        pane.setLayout(gl);
+
+        gl.setAutoCreateContainerGaps(true);
+
+        gl.setHorizontalGroup(gl.createSequentialGroup()
+                .addComponent(arg[0])
+        );
+
+        gl.setVerticalGroup(gl.createSequentialGroup()
+                .addComponent(arg[0])
+        );
+    }
+
+    public static void main(String[] args) {
+
+        EventQueue.invokeLater(() -> {
+            QuitButtonEx ex = new QuitButtonEx();
+            ex.setVisible(true);
+        });
+    }
+}
