# Reflect Learning

**Repository Path**: tzj2015/reflect-learning

## Basic Information

- **Project Name**: Reflect Learning
- **Description**: Java 反射常见使用
- **Primary Language**: Unknown
- **License**: Not specified
- **Default Branch**: master
- **Homepage**: None
- **GVP Project**: No

## Statistics

- **Stars**: 0
- **Forks**: 0
- **Created**: 2021-06-20
- **Last Updated**: 2021-06-20

## Categories & Tags

**Categories**: Uncategorized

**Tags**: None

## README

### Java 反射常见使用

#### 获取父类的所有属性(private/public/protected)
```java
Field[] superDeclaredFields = clazz.getSuperclass().getDeclaredFields();
Stream.of(superDeclaredFields).forEach(System.out::println);
```


#### 获取当前类的所有属性(private/public/protected)
```java
Field[] declaredFields = clazz.getDeclaredFields();
Stream.of(declaredFields).forEach(System.out::println);
```

#### 只能拿到 public 字段(当前类和父类)
```java
Field[] fields = clazz.getFields();
Stream.of(fields).forEach(System.out::println);
```

#### 无参构造函数创建对象
```java
User user = clazz.getConstructor().newInstance();
System.out.println("Empty Constructor Created: " + user);
```

#### 有参构造函数创建对象
```java
User jason = clazz.getConstructor(String.class, String.class).newInstance("Jason", "24");
System.out.println("Non-empty Constructor Created: " + jason);
```