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How to get the attributes and type of a class in Java?

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Release: 2017-07-03 09:27:11
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import Java.io.BufferedReader;
import java.io.InputStreamReader;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
public class test {
 public static void main(String[] args) throws Exception {
//  BufferedReader bb=new BufferedReader(new InputStreamReader(System.in));
//  String classname=bb.readLine();
  Class c=Class.forName("ArrayListTest.java");
  //-------------------获取方法的详细信息
  Method m[]=c.getDeclaredMethods();
  for(int i=0;i<m.length;i++)
  {
   //--------------------获得方法的名字
   System.out.println("方法的名字是:"+m[i].getName());
   //--------------------获得方法参数的类型和有几个参数
   Class b[]=m[i].getParameterTypes();//获得所有的参数并且存放到数组B中
   for(int j=0;j<b.length;j++)
   {
    System.out.println("参数的类型是"+b[j]);
   }
   //--------------------获得方法返回值的类型
   System.out.println(m[i].getReturnType());//获得方法的返回值类型
   //--------------------获得方法的修饰符
   int mod=m[i].getModifiers();
   System.out.println("方法的修饰符有"+Modifier.toString(mod));
   //--------------------获得方法的异常类型
   Class e[]=m[i].getExceptionTypes();//获得所有的异常类型存放到数组e中
   for(int k=0;k<e.length;k++)
   {
    System.out.println("方法的异常类型是:"+e[k]);
   }
   System.out.println("-------------------------------------------------------------------");
  }
  //----------------------------获得属性的详细信息
  
 }
}
package Class     //测试.com.tc.test.Class的forname方法获得属性信息;
import java.lang.reflect.Field;
import java.lang.reflect.Modifier;
public class test {
 public static void main(String[] args) throws ClassNotFoundException {
  Class c=Class.forName("Class测试.com.tc.test.Class的forname方法获得属性信息.student");//把要使用的类加载到内存中,并且把有关这个类的所有信息都存放到对象c中
  Field f[]=c.getDeclaredFields();//把属性的信息提取出来,并且存放到field类的对象中,因为每个field的对象只能存放一个属性的信息所以要用数组去接收
  for(int i=0;i<f.length;i++)
  {
   System.out.println("属性的名称是:"+f[i].getName());//获得属性的名字
   System.out.println("属性的类型是:"+f[i].getType());//获得属性的类型
   int mod=f[i].getModifiers();//获得修饰符的常量总和
   System.out.println(mod);
   System.out.println("属性的修饰符有:"+Modifier.toString(mod));//modifier类可以根据常量总和去计算到底有哪些修饰符
   System.out.println("-------------------------------------------------------");
  }
 }
}
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