update,

2025-01-31 19:15:17 +08:00
parent 09adae8c8e
commit 6c60a73f30
1546 changed files with 286918 additions and 0 deletions
--- a/_resources/it114105/itp4510/Lab03/Lab3.4/StringBst.java
+++ b/_resources/it114105/itp4510/Lab03/Lab3.4/StringBst.java
@@ -0,0 +1,89 @@
+public class StringBst  {
+    private StringBstNode root;
+
+    public StringBst() {
+        root = null;
+    }
+
+    public void addNode(String data) {
+        StringBstNode p = root, prev = null;
+        if (root == null) {
+            root = new StringBstNode(data);
+            return;
+        }
+        while (p != null) {
+            prev = p;
+            if (data.compareTo(p.getData()) < 0) {
+                p = p.getLeft();
+            } else {
+                p = p.getRight();
+            }
+        }
+        if (data.compareTo(prev.getData()) < 0) {
+            prev.setLeft(new StringBstNode(data));
+        } else {
+            prev.setRight(new StringBstNode(data));
+        }
+    }
+
+    public String search(String data) {
+        StringBstNode p = root;
+        if (root == null) {
+            return null;
+        }
+        while (p!=null) {
+            if (data.compareTo(p.getData()) < 0) {
+                p = p.getLeft();
+            } else if(data.compareTo(p.getData()) > 0){
+                p = p.getRight();
+            }
+            else{
+               return p.getData();
+            }
+        }
+       return null;
+
+    }
+
+    public void preorder() {
+        preorder(root);
+    }
+
+    public void preorder(StringBstNode v) {
+        System.out.print(v.getData() + " ");
+        if (v.getLeft() != null) {
+            preorder(v.getLeft());
+        }
+        if (v.getRight() != null) {
+            preorder(v.getRight());
+        }
+    }
+
+    public void inorder() {
+        inorder(root);
+    }
+
+    public void inorder(StringBstNode v) {
+        if (v.getLeft() != null) {
+            inorder(v.getLeft());
+        }
+        System.out.print(v.getData() + " ");
+        if (v.getRight() != null) {
+            inorder(v.getRight());
+        }
+    }
+
+    public void postorder() {
+        postorder(root);
+    }
+
+    public void postorder(StringBstNode v) {
+        if (v.getLeft() != null) {
+            postorder(v.getLeft());
+        }
+        if (v.getRight() != null) {
+            postorder(v.getRight());
+        }
+        System.out.print(v.getData() + " ");
+    }
+}