corejava第10版

corejava第10版/v2ch10/tree/SimpleTreeFrame.java

@@ -0,0 +1,45 @@
+package tree;
+
+import javax.swing.*;
+import javax.swing.tree.*;
+
+/**
+ * This frame contains a simple tree that displays a manually constructed tree model.
+ */
+public class SimpleTreeFrame extends JFrame
+{
+   private static final int DEFAULT_WIDTH = 300;
+   private static final int DEFAULT_HEIGHT = 200;
+
+   public SimpleTreeFrame()
+   {
+      setSize(DEFAULT_WIDTH, DEFAULT_HEIGHT);
+
+      // set up tree model data
+
+      DefaultMutableTreeNode root = new DefaultMutableTreeNode("World");
+      DefaultMutableTreeNode country = new DefaultMutableTreeNode("USA");
+      root.add(country);
+      DefaultMutableTreeNode state = new DefaultMutableTreeNode("California");
+      country.add(state);
+      DefaultMutableTreeNode city = new DefaultMutableTreeNode("San Jose");
+      state.add(city);
+      city = new DefaultMutableTreeNode("Cupertino");
+      state.add(city);
+      state = new DefaultMutableTreeNode("Michigan");
+      country.add(state);
+      city = new DefaultMutableTreeNode("Ann Arbor");
+      state.add(city);
+      country = new DefaultMutableTreeNode("Germany");
+      root.add(country);
+      state = new DefaultMutableTreeNode("Schleswig-Holstein");
+      country.add(state);
+      city = new DefaultMutableTreeNode("Kiel");
+      state.add(city);
+
+      // construct tree and put it in a scroll pane
+
+      JTree tree = new JTree(root);
+      add(new JScrollPane(tree));
+   }
+}