Retrieve Class Name/Instance from Object

Question

I am using a common RestTemplate to submit a request to Remote server. Where I am first making a login request, fetching the webToken and then making subsequent request using that token.

In this common RestTemplate, I am logging the request and response. But I want to avert logging the username and password in logging. Following is the example which I am trying to do.

 package reflection;

public class TypeCheck {

    public static void main(String[] args) {

        Object animal = new Animal("Elephant");     
        classType(animal.getClass());
        //Passing Class Type 
         // Output - Unmatched  class reflection.Animal
    }

    private static void classType(Object type) {
        if(type instanceof Animal) {
            System.out.println("Matched  "+ type);
        }

        System.out.println("Unmatched  " + type);
    }

 }

 class Animal {

    String name;

    public Animal(String name) {
        super();
        this.name = name;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

 }

Now, I want to extract the Class Type (i.e. reflection.Animal) from type parameter. I tried for type.getClass().getSimpleName() and some other methods but not getting better way to do it.

P.S. - Currently I am trying one clumsy way (as I think) to fetch this. But don't know if this is correct or we have some better way to achieve this.

if(type.toString().contains("Animal")) {
            System.out.println("Matched "+ type);
        }

Thanks in advance.

Try to pass animal instead of animal.getClass() to the classType method. — Arnaud
– Arnaud, Commented Feb 28, 2020 at 8:03

Subramanian Mariappan · Accepted Answer · 2020-02-28 08:12:04Z

1

You can simply check the same with istanceof if you pass the object itself to the classType method rather than the class of it.

    public static void main(String[] args) {
        Object animal = new Animal("Elephant");
        classType(animal);
    }

    private static void classType(Object type) {
        if (type instanceof Animal) {
            System.out.println("Matched  " + type);
        } else {
            System.out.println("Unmatched  " + type);
        }
    }

Or else if you want to check the same with class, you can try the following.

    public static void main(String[] args) {
        Object animal = new Animal("Elephant");
        classType(animal.getClass());
    }

    private static <T> void classType(Class<T> tClass) {
        if (tClass.getName().equals("Animal")) {
            System.out.println("Matched  " + tClass.getName());
        } else {
            System.out.println("Unmatched  " + tClass.getName());
        }
    }

answered Feb 28, 2020 at 8:12

Subramanian Mariappan

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1 Comment

Ashish Over a year ago

Thanks for prompt response. The option one is not possible as original API gives .class as an argument . So , the option 2, is fine with me and it is close to the attempt which I am also making. Many thanks it is working for me.

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