6、getDeclared系列方法 - 《Java反射》

getDeclaredConstructor(s)|Method(s)|Field(s)获取对应对象
getContructor(s)|Method(s)|Fidld(s) 只能获取public对象
访问非作用域内构造方法、方法、成员变量、会抛出异常

package com.qdxiaobu.reflect;
import com.qdxiaobu.reflect.entity.Employee;
import java.lang.reflect.Constructor;
import java.lang.reflect.Field;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.Locale;
public class getDeclaredSample {
  public static void main(String[] args) {
    // 获取对象所有成员变量值
    try {
      Class employeeClass = Class.forName("com.qdxiaobu.reflect.entity.Employee");
      Constructor constructor =
          employeeClass.getConstructor(
              new Class[] {Integer.class, String.class, Float.class, String.class});
      Employee em = (Employee) constructor.newInstance(new Object[] {100, "gaoi", 12f, "研发部"});
      Field[] Fields = employeeClass.getDeclaredFields();
      for (Field Field : Fields) {
        System.out.println(Field.getName());
        if (Field.getModifiers() == 1) { // public 修饰
          Object val = Field.get(em);
          System.out.println(Field.getName() + ":" + val);
        }else if (Field.getModifiers() == 2){
          String methodName = "get" + Field.getName().substring(0, 1).toUpperCase() + Field.getName().substring(1);
          Method method = employeeClass.getMethod(methodName);
          Object invoke = method.invoke(em);
          System.out.println(Field.getName()+":"+invoke);
        }
      }
    } catch (ClassNotFoundException e) {
      e.printStackTrace();
    } catch (NoSuchMethodException e) {
      e.printStackTrace();
    } catch (InstantiationException e) {
      e.printStackTrace();
    } catch (IllegalAccessException e) {
      e.printStackTrace();
    } catch (InvocationTargetException e) {
      e.printStackTrace();
    }
  }
}