Class clazz = new Person().getClass(); 
 try { 
  //调用指定的方法 
  /*@SuppressWarnings("unchecked") 
  Method me = clazz.getDeclaredMethod("getName", String.class); 
  me.invoke(clazz.newInstance(),"zhangsan");*/ 
  //获取所有的方法 
  Method[] methods = clazz.getDeclaredMethods(); 
  for (Method method : methods) { 
  System.out.println(method.getName()); 
  } 
 } catch (Exception e) { 
  e.printStackTrace(); 
 } 

@SuppressWarnings("unchecked") 
Method method = clazz.getDeclaredMethod("getName",new Class[]{String.class,int.class}); 
method.invoke(new Person(), new Object[]{"zhangsan",10});

class User{
public static void staticMethod(){
System.out.println(“static mthod invoke.”);
}
}
Eg:
Class<User> clz=User.class;
Method staticMethod=clz.getMethod(“staticMthod”);

@Test
 // 通过反射获取类定义的方法
 public void testMethod() throws Exception {
  @SuppressWarnings("rawtypes")
  Class clazz = Class.forName("java.lang.String");
  Method[] m = clazz.getDeclaredMethods();
  for (int i = 0; i < m.length; i++) {
   System.out.println(m[i].getName() + " " + m[i].getDeclaringClass());
  }
 }

 @Test
 // 通过反射获取类定义的变量
 public void testField() throws Exception {
  @SuppressWarnings("rawtypes")
  Class clazz = Class.forName("java.lang.String");
  Field[] fields = clazz.getFields();
  for (Field f : fields) {
   System.out.println(f.getName());
  }
 }

 @Test
 // 通过反射获取类定义的构造方法
 public void testConstructor() throws Exception {
  @SuppressWarnings("rawtypes")
  Class clazz = Class.forName("java.lang.String");
  @SuppressWarnings("rawtypes")
  Constructor[] cons = clazz.getConstructors();
  for (@SuppressWarnings("rawtypes")
  Constructor c : cons) {
   System.out.println(c + " " + c.getDeclaringClass());
  }
 }

@Test
 // 通过反射调用类定义的方法
 public void testInvokeMethod() throws Exception {
  Class clazz = Class.forName("java.lang.String");
  // 定义参数类型
  Class[] params = new Class[1];
  params[0] = String.class;
  Method m = clazz.getDeclaredMethod("indexOf", params);
  // 设置参数
  Object[] p = new Object[1];
  p[0] = "e";
  Integer s = (Integer) m.invoke("helloworld!", p);
  System.out.println(s);
 }