added methods

src/Tree.java

@@ -1,2 +1,65 @@
-public class Tree {
+import java.sql.Array;
+import java.util.*;
+
+
+public class Tree<T extends Comparable<T>>{
+    private T root;
+    private ArrayList<Tree<T>> subtrees;
+
+
+    public Tree(T root, ArrayList<Tree<T>> subtrees){
+        if (root == null){
+            this.subtrees = new ArrayList<>();
+        } else {
+            this.root = root;
+            this.subtrees = subtrees;
+        }
+    }
+
+
+    public int count(T item){
+        if (this.root == null){
+            return 0;
+        } else {
+            int counter = 0;
+            if (this.root.equals(item)){
+                counter++;
+            }
+            for (Tree<T> subtree : subtrees){
+                counter += subtree.count(item);
+            }
+            return counter;
+        }
+    }
+
+
+    public String __str__(){
+        return this.str_indented();
+    }
+
+
+    private String _str_indented(int depth){
+        if (this.is_empty()) {
+            return "";
+        } else {
+            StringBuilder s = new StringBuilder(' ' * depth + (String) this.root + "\n");
+            for (Tree<T> subtree : this.subtrees){
+                s.append(subtree._str_indented(depth + 1));
+            }
+            return s.toString();
+        }
+    }
+    private String _str_indented(){
+        if (this.is_empty()){
+            return "";
+        } else {
+            StringBuilder s = new StringBuilder((String) this.root + "\n");
+            for (Tree<T> subtree : this.subtrees){
+                s.append(subtree._str_indented(1));
+            }
+            return s.toString();
+        }
+    }
+
+
 }