一、獲取當前類定義的所有方法，不包括父類和介面的

class.getDeclaredMethods()

eg:

import java.lang.reflect.Method;

public class testH {
    //獲取java類的所有方法並打印出來
    public static void main(String args[]) {
        Class c = SSOUtil.class;
        Method[] m = c.getDeclaredMethods();
        for (int i = 0; i < m.length; i++) {
            System.out.println(m[i].getName());
        }
    }
}
 

會返回當前類定義的所有方法（包括私有的、靜態的、抽象的），但是不會返回介面和父類中定義的方法

二、獲取當前類所有的public方法，包括父類和介面的

class.getMethods()

會返回當前類所有的public方法，包括介面和父類中定義的public方法。

三、獲取當前類中所有的方法，包括父類和介面的

private Method[] getClassMethods(Class<?> cls) {
    Map<String, Method> uniqueMethods = new HashMap<String, Method>();
    Class
 
<?> currentClass = cls;
    while (currentClass != null && currentClass != Object.class) {
      addUniqueMethods(uniqueMethods, currentClass.getDeclaredMethods());

      //獲取介面中的所有方法
      Class<?>[] interfaces = currentClass.getInterfaces();
      for (Class<?> anInterface : interfaces) {
        addUniqueMethods(uniqueMethods, anInterface.getMethods());
      }
      
 
//獲取父類，繼續while迴圈
      currentClass = currentClass.getSuperclass();
    }

    Collection<Method> methods = uniqueMethods.values();

    return methods.toArray(new Method[methods.size()]);
  }

  private void addUniqueMethods(Map<String, Method> uniqueMethods, Method[] methods) {
    for (Method currentMethod : methods) {
      if (!currentMethod.isBridge()) {
      //獲取方法的簽名，格式是：返回值型別#方法名稱:引數型別列表
        String signature = getSignature(currentMethod);
        //檢查是否在子類中已經新增過該方法，如果在子類中已經新增過，則表示子類覆蓋了該方法，無須再向uniqueMethods集合中新增該方法了
        if (!uniqueMethods.containsKey(signature)) {
          if (canControlMemberAccessible()) {
            try {
              currentMethod.setAccessible(true);
            } catch (Exception e) {
              // Ignored. This is only a final precaution, nothing we can do.
            }
          }
          uniqueMethods.put(signature, currentMethod);
        }
      }
    }
  }

  private String getSignature(Method method) {
    StringBuilder sb = new StringBuilder();
    Class<?> returnType = method.getReturnType();
    if (returnType != null) {
      sb.append(returnType.getName()).append('#');
    }
    sb.append(method.getName());
    Class<?>[] parameters = method.getParameterTypes();
    for (int i = 0; i < parameters.length; i++) {
      if (i == 0) {
        sb.append(':');
      } else {
        sb.append(',');
      }
      sb.append(parameters[i].getName());
    }
    return sb.toString();
  }

  /**
   * Checks whether can control member accessible.
   *
   * @return If can control member accessible, it return {@literal true}
   * @since 3.5.0
   */
  public static boolean canControlMemberAccessible() {
    try {
      SecurityManager securityManager = System.getSecurityManager();
      if (null != securityManager) {
        securityManager.checkPermission(new ReflectPermission("suppressAccessChecks"));
      }
    } catch (SecurityException e) {
      return false;
    }
    return true;
  }

轉載自：https://blog.csdn.net/u011983531/article/details/80248945