java反射学习例子

package reflect;

import java.lang.reflect.Constructor;
import java.lang.reflect.Field;
import java.lang.reflect.InvocationTargetException;

/**
 * 反射的学习
 * @author hjsjy
 *
 */
public class Test01 {
	public int a;
	private int b;
	private String cString;
	public String name;
	protected String dString;
	int d;
	public Test01() {
		System.out.println("构造方法");
	}
	private Test01(int a) {
		System.out.println("私有的构造方法"+a);
	}
	public Test01(int a,int b) {
		System.out.println("构造方法两个参数");
	}
	@Override
	public String toString() {
		return "Test01 [a=" + a + ", b=" + b + ", cString=" + cString + ", name=" + name + ", dString=" + dString
				+ ", d=" + d + "]";
	}
	public static void main(String[] args) throws Exception{
		Class<?> class1 = Class.forName("reflect.Test01");
		 Constructor<?>[] constructors = class1.getConstructors();
		 for(Constructor aConstructor :constructors) {
			 System.out.println(aConstructor);
		 }
		 System.out.println("---------------------------------------------------------------------------");
		 constructors = class1.getDeclaredConstructors();
		for(Constructor constructor: constructors) {
			System.out.println(constructor);
		}
		System.out.println("---------------------------------------------------------------------------");
		Constructor<?> declaredConstructor = class1.getDeclaredConstructor(int.class);
		System.out.println(declaredConstructor);
		declaredConstructor.setAccessible(true);
		Object newInstance = declaredConstructor.newInstance(1);
		System.out.println("---------------------------------------------------------------------------");
		Field[] fields = class1.getFields();
		for(Field f:fields) {
			System.out.println(f);
		}
		System.out.println("---------------------------------------------------------------------------");
		Field[] declaredFields = class1.getDeclaredFields();
		for(Field field :declaredFields) {
			System.out.println(field);
		}
		Field field = class1.getField("name");	
		System.out.println(field);
		Object newInstance2 = class1.getConstructor().newInstance();
		field.set(newInstance2, "hjsjy");
		Test01 test01=(Test01)newInstance2;
		System.out.println(test01.name);
		System.out.println("---------------------------------------------------------------------------");
		Field declaredField = class1.getDeclaredField("b");
		System.out.println(declaredField);
		declaredField.setAccessible(true);
		declaredField.set(newInstance2, 188);
		System.out.println(newInstance2);
		
	}
}

本文参考：https://blog.csdn.net/sinat_38259539/article/details/71799078?tdsourcetag=s_pcqq_aiomsg