From 5b6fb34a82e071871025a64462da35eb8f21c6ac Mon Sep 17 00:00:00 2001
From: selear <selear@gmail.com>
Date: Tue, 21 Nov 2023 21:20:04 +0800
Subject: [PATCH] fix: Use .equals() to compare two strings in Java (#961)

---
 codes/java/chapter_tree/array_binary_tree.java | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/codes/java/chapter_tree/array_binary_tree.java b/codes/java/chapter_tree/array_binary_tree.java
index 029b1b0c4..a1f3fa865 100644
--- a/codes/java/chapter_tree/array_binary_tree.java
+++ b/codes/java/chapter_tree/array_binary_tree.java
@@ -63,15 +63,15 @@ class ArrayBinaryTree {
         if (val(i) == null)
             return;
         // 前序遍历
-        if (order == "pre")
+        if ("pre".equals(order))
             res.add(val(i));
         dfs(left(i), order, res);
         // 中序遍历
-        if (order == "in")
+        if ("in".equals(order))
             res.add(val(i));
         dfs(right(i), order, res);
         // 后序遍历
-        if (order == "post")
+        if ("post".equals(order))
             res.add(val(i));
     }