利用JSONObject解析帶有嵌套的json數組

public class MainActivity extends AppCompatActivity {
    private TextView tv;
    private Button bt;
    private String readyJson = "[{\"a\":\"123\",\"b\":\"456\",\"F\":{\"aa\":\"111\",\"bb\":\"222\"}},{\"a\":\"321\",\"b\":\"654\",\"F\":{\"aa\":\"333\",\"bb\":\"444\"}}]";
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        tv = findViewById(R.id.tv);
        bt = findViewById(R.id.start);
        bt.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                parseJsonWithJSONObject(readyJson);
            }
        });
    }

    private void parseJsonWithJSONObject(String readyJson) {
        try {
            JSONArray jsonArray = new JSONArray(readyJson);
            for (int i = 0; i<jsonArray.length();i++){
                JSONObject jsonObject = jsonArray.getJSONObject(i);
                Log.d("MainActivity",jsonObject.getString("a")+"+++++++++++++");
                tv.append(jsonObject.getString("a")+" ");
                Log.d("MainActivity",jsonObject.getString("b")+"-------------");
                tv.append(jsonObject.getString("b")+" ");
                //此處開始解析嵌套的json
                JSONObject jsonObject1 = new JSONObject(jsonObject.getString("F"));
                tv.append(jsonObject1.getString("aa")+" ");
                tv.append(jsonObject1.getString("bb")+" ");
            }
        } catch (JSONException e) {
            e.printStackTrace();
        }
    }
}