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package com.keuin.ohmyvanillamc;
import java.lang.reflect.Field;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.Arrays;
/**
* @Author 落叶飞翔的蜗牛 Keuin
* @Date 2018/3/10
* @Description 常用反射函数
*/
public final class ReflectionUtils {
/**
* 获取私有成员变量的值
*/
public static Object getPrivateField(Object instance, String filedName) throws NoSuchFieldException, IllegalAccessException {
Field field = instance.getClass().getDeclaredField(filedName);
field.setAccessible(true);
return field.get(instance);
}
/**
* 设置私有成员的值
*/
public static void setPrivateField(Object instance, String fieldName, Object value) throws NoSuchFieldException, IllegalAccessException {
Field field = instance.getClass().getDeclaredField(fieldName);
field.setAccessible(true);
field.set(instance, value);
}
/**
* 访问私有方法
*/
public static Object invokePrivateMethod(Object instance, String methodName, Class[] classes, Object... args) throws NoSuchMethodException, InvocationTargetException, IllegalAccessException {
Method method = instance.getClass().getDeclaredMethod(methodName, classes);
method.setAccessible(true);
return method.invoke(instance, args);
}
/**
* 获取所有成员变量的名字
*
* @param o 要获取成员变量的对象实例
* @return 所有成员变量名字数组
*/
public static String[] getFieldName(Object o) {
return Arrays.stream(o.getClass().getDeclaredFields()).map(Field::getName).toArray(String[]::new);
}
}
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