private key, public key and certificates relationship and best way to access specific certificate from keystore

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I used below keytool command:

keytool -genkey -alias <alias name> -keypass <keypassword> -keystore <keystore file name with location> -keyalg "RSA" -sigalg SHA1WITHRSA

Then I looked into keystore contents using below command:

keytool -list -v -keystore <keystore file name with location>

It displays below contents:

Keystore type: JKS
Keystore provider: SUN

Your keystore contains 1 entry

Alias name: keyalias
Creation date: Nov 23, 2017
Entry type: PrivateKeyEntry
Certificate chain length: 1
Certificate[1]:
Owner: CN=XXXXX, OU=SDG, O=XXXXX, L=XXXXX, ST=XX, C=IN
Issuer: CN=XXXXX, OU=SDG, O=XXXXX, L=XXXXX, ST=XX, C=IN
Serial number: 6c6ec57a
Valid from: Thu Nov 23 14:30:35 IST 2017 until: Wed Feb 21 14:30:35 IST 2018
Certificate fingerprints:
MD5:  85:08:01:27:BF:CA:88:17:88:11:9D:E4:DF:DC:70:AD
SHA1: 6D:14:08:BD:F6:4E:51:C2:A0:58:46:89:CC:85:06:BC:26:DA:23:4E
SHA256: D6:94:A8:31:2F:5D:29:FA:29:5F:8C:5D:24:D0:8E:47:D4:17:4C:B8:8A:
D8:A2:37:3F:18:24:5A:06:C1:E4:CB
Signature algorithm name: SHA1withRSA
Version: 3

Extensions:

#1: ObjectId: 2.5.29.14 Criticality=false
SubjectKeyIdentifier [
    KeyIdentifier [
        0000: 50 AD ED B0 1D 3D 12 AE   D4 C0 C7 EE 9F EE 43 11  P....=........C.
        0010: F4 71 02 93                                        .q..
    ]
]

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As I can see only a single entry in the keystore. Looking to get answers for the followings:

  1. Where is the public key?

  2. I can also see a certificate whereas I didn't create the same. If I need to access this certificate in java code then do I need to use the key alias or can I set any separate alias to access this certificate?

It will be great help if someone can explain how private key, public key and certificates are linked in a key store and how a specific certificate can be accessed from a keystore (assuming keystore is having multiple certificates).

2 Answers
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