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 private void volley() {
 
        String url = "http://x...content-available-to-author-only...x.xxx/A.php";
 
      /* 不同Button 對應不同 PHP
        String url = "http://x...content-available-to-author-only...x.xxx/B.php";
        String url = "http://x...content-available-to-author-only...x.xxx/C.php";
      */
 
        JSONObject object = new JSONObject();
        try {
            object.put("水果", "蘋果");
 
        } catch (JSONException e) {
            e.printStackTrace();
        }
 
        JsonObjectRequest mJsonObjectRequest = new JsonObjectRequest
                (Request.Method.POST, url, object, new Response.Listener<JSONObject>() {
                    @Override
                    public void onResponse(JSONObject response) {
                        try {
                             retStr.setText( response.toString()) ;
 
                        } catch (Exception e) {
 
                        }
                    }
                },
                        new Response.ErrorListener() {
                            @Override
                            public void onErrorResponse(VolleyError error) {
                                if (null != error) {
                                    Log.i("Volley", "錯誤訊息:" + error.toString()
                                    );
 
                                }
                            }
                        });
 
        mRequestQueue.add(mJsonObjectRequest);
 
    }

Main.java:1: error: class, interface, or enum expected
 private void volley() {
         ^
Main.java:10: error: class, interface, or enum expected
        JSONObject object = new JSONObject();
        ^
Main.java:11: error: class, interface, or enum expected
        try {
        ^
Main.java:14: error: class, interface, or enum expected
        } catch (JSONException e) {
        ^
Main.java:16: error: class, interface, or enum expected
        }
        ^
Main.java:21: error: class, interface, or enum expected
                    public void onResponse(JSONObject response) {
                           ^
Main.java:25: error: class, interface, or enum expected
                        } catch (Exception e) {
                        ^
Main.java:32: error: class, interface, or enum expected
                            public void onErrorResponse(VolleyError error) {
                                   ^
Main.java:37: error: class, interface, or enum expected
                                }
                                ^
Main.java:41: error: class, interface, or enum expected
        mRequestQueue.add(mJsonObjectRequest);
        ^
Main.java:43: error: class, interface, or enum expected
    }
    ^
11 errors

Standard output is empty