Java反射中getMethods()与getDeclaredMethod()区别-蒲公英云

Java反射中getMethods()与getDeclaredMethod()区别

getMethods

获取当前类和父类的所有公有方法（私有的不返回），数组形式返回

@CallerSensitive
    public Method[] getMethods() throws SecurityException { 
        checkMemberAccess(Member.PUBLIC, Reflection.getCallerClass(), true);
        return copyMethods(privateGetPublicMethods());
    }

getDeclaredMethods

只查询当前类的所有定义的方法（包含私有的），同时还有重载方法，直接根据name和参数类型返回一个方法。找不到方法抛出NoSuchMethodException

@CallerSensitive
    public Method[] getDeclaredMethods() throws SecurityException { 
        checkMemberAccess(Member.DECLARED, Reflection.getCallerClass(), true);
        return copyMethods(privateGetDeclaredMethods(false));
    }
    @CallerSensitive
    public Method getDeclaredMethod(String name, Class<?>... parameterTypes)
        throws NoSuchMethodException, SecurityException { 
        checkMemberAccess(Member.DECLARED, Reflection.getCallerClass(), true);
        Method method = searchMethods(privateGetDeclaredMethods(false), name, parameterTypes);
        if (method == null) { 
            throw new NoSuchMethodException(getName() + "." + name + argumentTypesToString(parameterTypes));
        }
        return method;
    }