Android development of two identical String, why in the if judgment TianJian does not hold?

** Android development of two identical "string", why in if judgment is not valid?
**

事情是这样的，我有一个项目需要用到shell脚本，常规地用了Runtime.getRuntime().exec（）这个方法，并且通过输出流获取到了脚本的echo，并将 echo 的字符串返回。这么说可能不太清楚，举个例子

// shell 脚本
public static final String SHELL_TEST1 = "echo \"ok\"" ;

//执行shell并获取返回值的方法：
    /**
     * @注解 执行shell命令，并获取shell的返回值
     * @param mycmd shell命令
     * TODO 也可以执行.sh脚本文件，只需要输入路径即可*/
    public static String RunCmd1(String mycmd) {
        Process su = null;
        // 定义shell返回值
        String result = null;
        try {
            su = Runtime.getRuntime().exec("su");
            DataOutputStream outputStream = new DataOutputStream(su.getOutputStream());
            outputStream.writeBytes(mycmd + "\n");
            outputStream.flush();

            outputStream.writeBytes("exit\n");
            outputStream.flush();

            su.waitFor();

            // 获取shell返回流
            BufferedReader br = new BufferedReader(new InputStreamReader(su.getInputStream()));
            StringBuffer sb2 = new StringBuffer();
            String line;
            while ((line = br.readLine()) != null) {
                sb2.append(line).append("\n");
                System.out.println("==============================循环体中" + result);
            }
            result = sb2.toString();
            // 关闭输入流
            br.close();
            System.out.println("==============================" + result);

        } catch (IOException | InterruptedException e) {
            e.printStackTrace();
        }

        String s = result.toString();
        return s;

    }

Above defines the shell statement and the method to execute the shell. Below is a call to

//在某个按钮的点击事件中调用，假设shell脚本是耗时操作，比如复制文件，所以用到了线程通信
public onClick(View  v){
    Handler handler = new Handler(Looper.myLooper()){
        @Override
        public void handleMessage(@NonNull Message msg) {
             super.handleMessage(msg);
             if (msg.what == 666){
                  String isOk = (String) msg.obj;
                  System.out.println("=========================================handler接收的返回值为：" + isOk);
                     if (isOk.equals("1")) {
                      ToastUtil.out(context,"成功").show();
                     } else {
                               System.out.println("=========================================handler判断条件不成立" );
                                }
             }
    };
     new Thread(() -> {
           Message msg = new Message();
            msg.what = 666;
               String s = RunCmd1(SHELL_TEST1 )；
              System.out.println("====================================================util调用cmd命令得到的返回值为：" + runCmd1);
               msg.obj = runCmd1;
              handler.sendMessage(msg);
       }).start();
  
}

, run the mobile phone, Logcat shows: < br / >

< div class = "aw - list - img >