java的反射机制

public static void main(String[] args) {
    try {
      Class clazz = Class.forName("cn.com.mysite.sink.ScalaSink");
      Field[] fields = clazz.getDeclaredFields();    
            for(int i = 0; i < fields.length; i++) {    
               // 权限修饰符
                int mo = fields[i].getModifiers();
                String priv = Modifier.toString(mo);
                // 属性类型
                Class<?> type = fields[i].getType();
                System.out.println(priv + " " + type.getName() + " "
                        + fields[i].getName() + ";");
            }    
            System.out.println();
            System.out.println("Public fields: ");    
            fields = clazz.getFields();    
            for(int i = 0; i < fields.length; i++) {    
                int mo = fields[i].getModifiers();
                String priv = Modifier.toString(mo);
                // 属性类型
                Class<?> type = fields[i].getType();
                System.out.println(priv + " " + type.getName() + " "
                        + fields[i].getName() + ";");
            }  
            
            
            Method method=clazz.getDeclaredMethod("isEmpty",String.class);
            method.setAccessible(true);
            Object o = method.invoke((cn.com.mysite.sink.ScalaSink)clazz.newInstance(),"");
            System.out.println(o);
    } catch (Exception e) {
      e.printStackTrace();
    }
  }

private static final org.slf4j.Logger logger;
public static final java.lang.String TOPIC_HDR;
private java.lang.String isWhite;
private java.util.Properties kafkaProps;
private java.lang.String topic;
private int batchSize;
private java.lang.String hostname;
private java.lang.String uripath;
private java.lang.String field;
private java.lang.String dataSource;
private [Ljava.lang.String; f;
private java.util.List messageList;
private org.apache.flume.sink.SinkCounter counter;
private com.ibm.tivoli.unity.common.rest.RestClient restClient;
private com.ibm.tivoli.unity.common.rest.RequestResult result;
private java.text.SimpleDateFormat df;
private java.text.SimpleDateFormat format;
private java.util.Map map;
private com.ibm.json.java.JSONObject batch;
private java.lang.StringBuilder sb;
private com.ibm.json.java.JSONObject job;
private static java.security.MessageDigest digest;
private java.util.concurrent.ExecutorService threadPool;
private long bytes;
private int _count;
private java.io.File timeFile;
private long lastSendTime;
private long sendTimeInterval;
private boolean isWrite;
private java.io.FileWriter writer;
private boolean countFlowEnable;
Public fields: 
public static final java.lang.String TOPIC_HDR;
true