java - java中如何统计变量和方法的个数

Question

我有一个 java 文件 a.java 包含

int ab( fg)
abs
bcd 
abs
int x,y;

现在我想区分 int 变量和 int 方法，并将其存储在不同的数组中并将输出作为变量:a b 和方法:ab 但我很困惑如何区分两者..

class ClassDemo {
    public static void main(String args[]) {
        BufferedReader br = null;
        try {
            String intarray[] = new String[50]; /*declaring array for int */
            String line, a, str = null;
            char str1 = 0;            /*declaring char str1*/
            char str2[] = new char[20];
            char str3 = 0;            /*declaring char str1*/
            char str4[] = new char[20];
            br = new BufferedReader(new FileReader("c:/java/a.java")); /*loading file*/
            while ((line = br.readLine()) != null) /*reading file*/ {
                StringTokenizer stringTokenizer = new StringTokenizer(line); /*spliting       the line into string*/
                while (stringTokenizer.hasMoreElements()) /*checking more elememts*/

                {
                    str = stringTokenizer.nextElement().toString();
                    if (str.equals("int"))/*compare for int*/ {

                        while (str1 != '(') {
                            str = stringTokenizer.nextElement().toString();
                            for (int i = 0; i < str.length(); i++) {
                                str1 = str.charAt(i);
                                str2[i] = str1;
                                System.out.println(str2[i]);
                            }
                        }
                        while (str3 != ';') {
                            str = stringTokenizer.nextElement().toString();
                            for (int i = 0; i < str.length(); i++) {
                                str3 = str.charAt(i);
                                str4[i] = str3;
                                System.out.println(str4[i]);
                            }
                        }
                    }
                }
            }
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            try {
                if (br != null)
                    br.close();
            } catch (IOException ex) {
                ex.printStackTrace();
            }
        }
    }
}

Answer 1

java中的Reflection允许您在运行时获取有关类的信息。Reflection包有多个类用于方法/字段/接口(interface)等。这里有一个例子......

import java.lang.reflect.Method;
import java.lang.reflect.Field;
class DummyClass
{
    public int x;
    public int z;
  public int meathod1()
  {   return 1;
     }
  public int meathod2()
  {    return 2;
      }
  public int method3()
  {    return 3;
    }
}

class MainClass
{
   public static void main(String...s)
   {
      //Step 1: Getting the object of the class whose Fields/method u want to get.

    DummyClass obj=new DummyClass();

   //Step 2. Getting the Class of the class whose field/method u want to get.You can skip Step 1 if u already have Object the class.

     Class myClass=obj.getClass();

    //Step 3.Class has some multiple inbuilt methods to get the methods and Fields of any class.

      Method[] methodList=myClass.getDeclaredMethods();


    /*Now u have all the Methods you have declared in the class.The length of the methodList is the no of declared methods u have in your class.If u want to get the inherited methods too,then use getMethods() instead of getDeclaredMethods(),but then all your methods must be public then because getMethods() returns only public methods.*/
    System.out.println("Total No of Methods : "+methodList.length);

    //Step 4. Class has some other Inbuild methods that return Fields.

    Field[] fieldList=myClass.getDeclaredFields();
    System.out.println("Total no of Fields : "+fieldList.length);
    }
    }