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Adding a Certificate to a Key Store

import java.io.File; import java.io.FileInputStream; import java.io.FileOutputStream; import java.security.Key; import java.security.KeyStore; import java.security.cert.Certificate; 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());     String alias = "myalias";     char[] password = "password".toCharArray();     Certificate cert = keystore.getCertificate(alias);     File keystoreFile = new File("your.keystore");     // Load the keystore contents     FileInputStream in = new FileInputStream(keystoreFile);     keystore.load(in, password);     in.close();     // Add the certificate     keystore.setCertificateEntry(alias, cert);     // Save the new keystore contents     FileOutputStream out = new FileOutputStream(keystoreFile);     keystore.store(out, password);     out.close();   } }