import java.io.FileInputStream;
import java.security.KeyStore;
public class Main {
public static void main(String[] argv) throws Exception {
FileInputStream is = new FileInputStream("your.keystore");
KeyStore keystore = KeyStore.getInstance(KeyStore.getDefaultType());
keystore.load(is, "my-keystore-password".toCharArray());
// Get certificate
java.security.cert.Certificate cert = keystore.getCertificate("myalias");
}
}