目录

四、 Field获取

Person类： 

1. getField(StringfieldName)【public】

代码：

！！protected、private不可以获取哦~

2. getFields()方法【public】

 代码：

！！public方法可以获取，但是protected,private不可以获取哦~

3. getDeclaredField(String name)方法【public/protected/private】

代码：

！！public/protected/private/final/native都可获取哦！耶！

4.getDeclaredFields()【public/protected/private】 

代码：

！！啥都可以获取

四、 Field获取

Person类： 

package people.constructor;

import java.util.Date;



public class Person {
	public String name;
	protected boolean sex;
	private int age;
}

1. getField(StringfieldName)【public】

代码：

package people.constructor;

import java.lang.reflect.Field;



public class Bootstrap2 {
  public static void main(String[] args) throws NoSuchFieldException{
	  Class clazz = Person.class;
	  Field field = clazz.getField("name");
	  System.out.println(field.toString());
	  
	  //field = clazz.getField("sex"); //测试protected权限
	  field = clazz.getField("age"); //测试private权限
  }
}

public java.lang.String people.constructor.Person.name
Exception in thread "main" java.lang.NoSuchFieldException: age
	at java.base/java.lang.Class.getField(Class.java:2092)
	at studentsa/people.constructor.Bootstrap2.main(Bootstrap2.java:20)

！！protected、private不可以获取哦~

2. getFields()方法【public】

 代码：

package people.constructor;

import java.lang.reflect.Field;



public class Bootstrap2 {
  public static void main(String[] args) throws NoSuchFieldException{
	  Class clazz = Person.class;
	  Field[] fields = clazz.getFields();
	  for(Field field: fields) {
		  System.out.println(field.toString());
	  }
  }
}

public java.lang.String people.constructor.Person.name

！！public方法可以获取，但是protected,private不可以获取哦~

3. getDeclaredField(String name)方法【public/protected/private】

代码：

package people.constructor;

import java.lang.reflect.Field;



public class Bootstrap2 {
  public static void main(String[] args) throws NoSuchFieldException{
	  Class clazz = Person.class;
	  Field field = clazz.getDeclaredField("name");
	  System.out.println(field.toString());
	  
	  field = clazz.getDeclaredField("sex"); //测试protected权限
	  System.out.println(field.toString());
	  field = clazz.getDeclaredField("age"); //测试private权限
	  System.out.println(field.toString());
  }
}

public java.lang.String people.constructor.Person.name
protected boolean people.constructor.Person.sex
private int people.constructor.Person.age

！！public/protected/private/final/native都可获取哦！耶！

4.getDeclaredFields()【public/protected/private】 

代码：

package people.constructor;

import java.lang.reflect.Field;



public class Bootstrap2 {
  public static void main(String[] args) throws NoSuchFieldException{
	  Class clazz = Person.class;
	  Field[] fields = clazz.getDeclaredFields();
	  for(Field field: fields) {
		  System.out.println(field.toString());
	  }
  }
}

public java.lang.String people.constructor.Person.name
protected boolean people.constructor.Person.sex
private int people.constructor.Person.age

！！啥都可以获取