遍历未知类型对象属性

引用：https://blog.csdn.net/ExceptionalBoy/article/details/79203465

1. 反射获取field
2. 反射获取getXXX() 方法

 @Test
    public void test02 () throws IllegalAccessException {
    
        Object cc = new Student(1, "cc");
// printBeanField(cc);
        printBeanField2(cc);
    }


 private void printBeanField(Object obj) throws IllegalAccessException {
    
        // 判断对象是否为空
        if (obj != null){
    
            Field[] fields = obj.getClass().getDeclaredFields();
            if (fields != null && fields.length !=0){
    
                for (Field f : fields) {
    
                    f.setAccessible(true);
                    Object fieldValue = f.get(obj);
                    String fieldName = f.getName();
                    System.out.println(fieldName+"---"+fieldValue);
                }
            }
        }
    }


    private void printBeanField2(Object obj) {
    
        if (obj != null){
    
            Method[] methods = obj.getClass().getDeclaredMethods();
            if (methods != null && methods.length>0){
    
                Arrays.stream(methods).filter((item)->item.getName().startsWith("get")).forEach(item->{
    
                    try {
    
                        item.setAccessible(true);
                        String methodName = item.getName();
                        Object methodValue = item.invoke(obj);
                        System.out.println(methodName+"--"+methodValue);
                    } catch (IllegalAccessException e) {
    
                        e.printStackTrace();
                    } catch (InvocationTargetException e) {
    
                        e.printStackTrace();
                    }
                });
            }
        }
    }