Question

Write a JAVA code to do the following:

create a class and add methods to count the number of primitive fields, number of methods with primitive return types, a method that will also return the number of primitive in a given parameter. they are:

public int getNumberOfPrimitiveMethods(Class host)

public int getNumberOfPrimitiveFields(Class host)

public int getNumberOfPrimitiveParameters(Method host)

also

public int getNumberOfPrivateMethods (Class host)

public int getNumberOfPublicMethods (Class host)

Answer 1

Code:

import java.lang.reflect.Method;
import java.lang.reflect.Field;
import java.lang.reflect.Modifier;
import java.lang.reflect.Parameter;
class Test{
    public int getNumberOfPrimitiveMethods(Class host){
        int count=0;
        //get all the methods declared in class
        Method[] methods=host.getDeclaredMethods();
        for (Method method:methods){
              
               //if the returnTpe is primitive and not void
                if (method.getReturnType().isPrimitive() &&(! method.getReturnType().equals(Void.TYPE))){
                 
                    count++;
                }
              
        }
        return count;
      
    }
  
    public int getNumberOfPrimitiveFields(Class host){
        int count=0;
        //get all the declared fields
        Field fields[]=host.getDeclaredFields();
        //iterate the fields and check if they are primitive
        for(int i=0;i<fields.length;i++){
            if(fields[i].getType().isPrimitive())
                count++;
        }
        return count;
    }

  

    public int getNumberOfPrimitiveParameters(Method host){
        int count=0;
        //get all the parameter of the method paased
        Parameter parameters[]=host.getParameters();
        //iterate each parameter in parameters[]
        for(Parameter parameter:parameters){
            //if the return type is primitive increment count
            if(parameter.getType().isPrimitive())
                count++;
          
        }
      
        return count;
      
    }

    public int getNumberOfPrivateMethods (Class host){
            int count=0;
            Method methods[]=host.getDeclaredMethods();
            for (Method method:methods){
                if(Modifier.isPrivate(method.getModifiers())){
                 count++;
                }
            }
            return count;
        }

    public int getNumberOfPublicMethods (Class host){
        int count=0;
            Method methods[]=host.getDeclaredMethods();
            for (Method method:methods){
                if(Modifier.isPublic(method.getModifiers())){
                 count++;
                }
            }
            return count;
        }
      
    }

class Employee{
     private int employeeNumber;
     public String name;
     private boolean female;
     public Test t;
   
     public void empDetails(){
       
     }
   
     private void private1(){
       
     }
     private void private2(){
       
     }
   
     public int add(int a,int b,Employee c,String d){
         return a+b;
     }
     private String name(){
         return name;
     }
   
   
  

  
}

public class CountTypes {

    public static void main(String[] args) throws NoSuchMethodException {
        Employee e=new Employee();
        Class host=e.getClass();
        Class []param_types=new Class[]{Integer.TYPE,Integer.TYPE,Employee.class,String.class};
      
      
        Method method=host.getDeclaredMethod("add",param_types);
       // method.invoke(,1,e,"");
        Test t=new Test();
      
        System.out.println("Number of primitive Method Type: "+ t.getNumberOfPrimitiveMethods(host));
        System.out.println("Number of primitive Fields: "+ t.getNumberOfPrimitiveFields(host));
        System.out.println("Number of primitive parameters: "+ t.getNumberOfPrimitiveParameters(method));
        System.out.println("Number of private Method: "+ t.getNumberOfPrivateMethods(host));
        System.out.println("Number of public Method: "+ t.getNumberOfPublicMethods(host));
    }
  
}

Output: