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Using Certificates in Java

import java.io.FileInputStream; import java.security.cert.Certificate; import java.security.cert.CertificateFactory; public class MainClass {   public static void main(String[] args) throws Exception {     CertificateFactory certFactory = CertificateFactory.getInstance("X.509");     FileInputStream fis = new FileInputStream("a.dat");     Certificate cert = certFactory.generateCertificate(fis);     fis.close();     System.out.println(cert);   } }