java中获取类的有关信息

public class ImplementTest {
public static void main(String[] args) {
Date date = new Date();
Class cs = date.getClass();
String className = cs.getName();
Constructor[] con = cs.getDeclaredConstructors();
Field[] fields = cs.getDeclaredFields();
Method[] methods = cs.getDeclaredMethods();
System.out.println("类的名字:"+className);
System.out.println("类中的成员变量:");
for (int i = 0; i < fields.length; i++) {
System.out.println(fields[i].toString());
}
System.out.println("类中的方法：");
for (int i = 0; i < methods.length; i++) {
System.out.println(methods[i].toString());
}
System.out.println("类中的构造方法:");
for (int i = 0; i < con.length; i++) {
System.out.println(con[i]);
}
}
}