How to extract the methods of the sub objects

How do i access the get methods of the custom object. I am able to extract the primitive methods but not able to do when it comes to Non-Primitive Objects.

I am trying to do it as follows.

public class DataExtraction {

    public void showTheData(Object student) throws IOException {

        Class classofStudent = student.getClass();

        Method[] methodsOfStudent = classofStudent.getDeclaredMethods();


        for(Method method:methodsOfStudent) 
        {

            if(isGetType(method)) 
            {
                if(method.getReturnType()==String.class) 
                {
                    try(InputStream is = new FileInputStream("ObjectFileReaderPrimitive.properties"))
                    {
                        //InputStream is = new FileInputStream("ObjectFileReaderPrimitive.properties");
                        Properties properties = new Properties();
                        properties.load(is);
                    System.out.println(properties.getProperty(method.getName()));   

                    }
                }
             else 

                try(InputStream is = new FileInputStream("ObjectFileReaderNonPrimitive.properties"))
                {
                    Class innerObjectClass = method.getReturnType().getClass();
                    Method[] methodsOfinnerObject = innerObjectClass.getDeclaredMethods();
                    for(Method methodofInnerClass : methodsOfinnerObject) {
                        if(isGetType(method)) 
                        {
                            Properties properties = new Properties();
                            properties.load(is);
                            System.out.println(properties.getProperty(methodofInnerClass.getName()));   
                        }
                }}
            }
        }}

    private boolean isGetType(Method method) {

        if(method.getName().startsWith("get"))

        return true;
        return false;
    }


}

Where the student class is as follows-:

package com.sample;

public class Student {

    private String id;
    private String section;
    private Address address;
    public Student(String id, String section, Address address) {
        super();
        this.id = id;
        this.section = section;
        this.address = address;
    }
    public Student() {
        super();
    }
    public String getId() {
        return id;
    }
    public void setId(String id) {
        this.id = id;
    }
    public String getSection() {
        return section;
    }
    public void setSection(String section) {
        this.section = section;
    }
    public Address getAddress() {
        return address;
    }
    public void setAddress(Address address) {
        this.address = address;
    }
    @Override
    public String toString() {
        return "Student [id=" + id + ", section=" + section + ", address=" + address + "]";
    }



}

Please help me out if anyone knows how to achieve this . Its very urjent any type of help will be much appreciated.