Get instance of KeyPairGenerator class

GetKeyPairGenerator.java

try {
    KeyPairGenerator keyPairGenerator = KeyPairGenerator.getInstance("RSA");
    keyPairGenerator.initialize(1024);
    KeyPair keyPair = keyPairGenerator.generateKeyPair();

    PublicKey publicKey = keyPair.getPublic();
    PrivateKey privateKey = keyPair.getPrivate();
} catch (NoSuchAlgorithmException e) {
    e.printStackTrace();
}