Reading the code of sun/security/tools/keytool/Main.java
-----------------
int i = 0;
for (Certificate cert : chain) {
try {
if (rfc) {
dumpCert(cert, out);
} else {
out.println("Certificate #" + i++);
out.println("====================================");
printX509Cert((X509Certificate)cert, out);
out.println();
}
///// the following line can output "certificate 3 of 2" because oneInMany prints (i+1)
checkWeak(oneInMany(rb.getString("the.certificate"), i, chain.size()), cert);
-----------------