How to add a java SSL certificate

There are two files with the example extension.key and example. crt, and there is a java application using the HttpsURLConnection class. The question is, what should I do with these two files to make my application work. I tried using PKCS12 and couldn't explicitly specify it in the keystore.

    KeyStore ks = KeyStore.getInstance("PKCS12");
    FileInputStream fis =new 
    FileInputStream(".../example.p12");
    ks.load(fis, "qwerty".toCharArray()); // There are other ways to read 
    the password.
    fis.close();


    SSLContext sc = SSLContext.getInstance("SSL");
    KeyManagerFactory kmf 
    =KeyManagerFactory.getInstance(KeyManagerFactory.getDefaultAlgorithm());
    kmf.init(ks,"qwerty".toCharArray());
    KeyManager[] kms = kmf.getKeyManagers();
    sc.init(kms, null, new SecureRandom());
    URL url = new 
    URL("https://...");
    HttpsURLConnection request = (HttpsURLConnection) url.openConnection();
        request.setSSLSocketFactory(sc.getSocketFactory());