From cbc640203564f13f9f75cb927a358e466c0746f0 Mon Sep 17 00:00:00 2001
From: XenoAmess <xenoamess@gmail.com>
Date: Thu, 14 Oct 2021 11:09:19 +0800
Subject: [PATCH] use StringBuilder instead of StringBuffer when can (#1980)

---
 .../src/main/java/com/taobao/arthas/common/ReflectUtils.java  | 2 +-
 core/src/main/java/com/taobao/arthas/core/util/NetUtils.java  | 4 ++--
 .../main/java/com/taobao/arthas/core/util/StringUtils.java    | 2 +-
 3 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/common/src/main/java/com/taobao/arthas/common/ReflectUtils.java b/common/src/main/java/com/taobao/arthas/common/ReflectUtils.java
index bb7e3d155..7be111e77 100644
--- a/common/src/main/java/com/taobao/arthas/common/ReflectUtils.java
+++ b/common/src/main/java/com/taobao/arthas/common/ReflectUtils.java
@@ -212,7 +212,7 @@ public class ReflectUtils {
         while ((index = className.indexOf("[]", index) + 1) > 0) {
             dimensions++;
         }
-        StringBuffer brackets = new StringBuffer(className.length() - dimensions);
+        StringBuilder brackets = new StringBuilder(className.length() - dimensions);
         for (int i = 0; i < dimensions; i++) {
             brackets.append('[');
         }
diff --git a/core/src/main/java/com/taobao/arthas/core/util/NetUtils.java b/core/src/main/java/com/taobao/arthas/core/util/NetUtils.java
index f7be4f7ce..2b59c18b1 100644
--- a/core/src/main/java/com/taobao/arthas/core/util/NetUtils.java
+++ b/core/src/main/java/com/taobao/arthas/core/util/NetUtils.java
@@ -83,7 +83,7 @@ public class NetUtils {
             int responseCode = con.getResponseCode();
 
             br = new BufferedReader(new InputStreamReader(con.getInputStream()));
-            StringBuffer sb = new StringBuffer();
+            StringBuilder sb = new StringBuilder();
             String line = null;
             while ((line = br.readLine()) != null) {
                 sb.append(line);
@@ -138,7 +138,7 @@ public class NetUtils {
             pw.flush();
 
             br = new BufferedReader(new InputStreamReader(s.getInputStream()));
-            StringBuffer sb = new StringBuffer();
+            StringBuilder sb = new StringBuilder();
             String line = null;
             boolean start = false;
             while ((line = br.readLine()) != null) {
diff --git a/core/src/main/java/com/taobao/arthas/core/util/StringUtils.java b/core/src/main/java/com/taobao/arthas/core/util/StringUtils.java
index d18b8d88d..8e80eea8d 100644
--- a/core/src/main/java/com/taobao/arthas/core/util/StringUtils.java
+++ b/core/src/main/java/com/taobao/arthas/core/util/StringUtils.java
@@ -689,7 +689,7 @@ public abstract class StringUtils {
         }
         int arraySize = array.length;
         int bufSize = (arraySize == 0 ? 0 : (array[0].toString().length() + separator.length()) * arraySize);
-        StringBuffer buf = new StringBuffer(bufSize);
+        StringBuilder buf = new StringBuilder(bufSize);
 
         for (int i = 0; i < arraySize; i++) {
             if (i > 0) {