package example;
import java.io.IOException;
import okhttp3.Interceptor;
import okhttp3.OkHttpClient;
import okhttp3.Request;
import okhttp3.Response;

public class FinalUrlResolver {

    private OkHttpClient mClient = new OkHttpClient.Builder()
            .addNetworkInterceptor(new Interceptor() {
                @Override
                public Response intercept(Chain chain) throws IOException {
                    return chain.proceed(chain.request());
                }
            })
            .build();

    public String get(String url) throws IOException {
        final Response r = mClient.newCall(new Request.Builder().url(url).build()).execute();
        return r.request().url().toString();
    }
}

package example;

import java.io.IOException;

public class Example {

    public static void main(String[] args) throws IOException {
        FinalUrlResolver o=new FinalUrlResolver();
        String url="https://qiita.com/settings/account";
        String finalUrl=o.get(url);
        System.out.println("original url="+url);
        System.out.println("final url="+finalUrl);
    }
}

<dependency>
    <groupId>com.squareup.okhttp3</groupId>
    <artifactId>okhttp</artifactId>
    <version>3.13.1</version>
</dependency>

original url=https://qiita.com/settings/account
final url=https://qiita.com/login?redirect_to=https%3A%2F%2Fqiita.com%2Fsettings%2Faccount

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