小编Bud*_*Kis的帖子

我正在准备面试,当我经历空指针异常时,我突然意识到每个对象都能以某种方式抛出空指针异常,但我似乎无法想象某些对象如System,Out等抛出NullPointerException.谁能提到这样的场景？谢谢!

例如: System.out.println(s.get(name));

我想将map {key:column,key1:column1}转换为csv字符串"key = column,key1 = column".

我正在获取入口映射并从键和值构造字符串.这就是我所拥有的:

        entry.forEach(entryVal ->{
            result.append(entryVal.getKey() + "=" + entryVal.getValue());
            result.append(',');
        });
        int index = result.lastIndexOf(",");
        if(index == result.length()-1){
            result.deleteCharAt(index);
            return result.toString();
        }

当然,看起来很难看,特别是我必须对逗号进行后处理.想知道是否有更清洁的方法吗？

注意:我不需要代码审查,只需要知道一种不同但更清晰的方式来编写同样的东西,如果可能的话

我正在尝试测试这种方法。

@Override
public JSON connectResource() throws IOException {
    //get the location and credentials for the certificates
    System.setProperty("javax.net.ssl.trustStore", "C:/Program Files/Java/jdk1.7.0_40/jre/lib/security/cacerts");
    System.setProperty("javax.net.ssl.trustStorePassword", "changeit");
    HttpRequest httpRequest = new HttpGet(url);
    System.out.println("hello");
    httpRequest.addHeader("Accept", "application/json");
    HttpResponse response = httpClient.execute((HttpUriRequest) httpRequest);
    System.out.println("hello1");
    HttpEntity httpEntity = response.getEntity();
    String data = this.getData(httpEntity);
    return  JSONSerializer.toJSON(data.toString());
}

我的设置方法是：

@Before
public void setUp() throws Exception{
    mockHttpClient = mock(DefaultHttpClient.class);
    mockHttpRequest = mock(HttpUriRequest.class);
    mockHttpResponse = mock(BasicHttpResponse.class);
    mockHttpEntity = mock(HttpEntity.class);
    mockInputStream = mock(InputStream.class);
    mockInputStreamReader = mock(InputStreamReader.class);
    mockBufferedReader = mock(BufferedReader.class);
    mockHttpGet = mock(HttpGet.class);
    mockHttpRequestBase = mock(HttpRequestBase.class); …