KeyStore getDefaultType() method in Java with Examples

02 Sep, 2021
The getDefaultType() method of java.security.KeyStore class is used to provide the default instance of Keystore class.
Syntax: 
public static final String getDefaultType()
Parameter: This method takes nothing as a parameter.Return Value: This method returns the default instance of Keystore class.
Note: All the programs in this article won’t run on online IDE as no ‘privatekey’ Keystore exists. You can check this code on the Java compiler on your system. To check this code, create a Keystore ‘privatekey’ on your system and set your own Keystore password to access that Keystore.
Below are the examples to illustrate the getDefaultType() method:
Example 1:
Java
// Java program to demonstrate getDefaultType() method import java.security.*;import java.security.cert.*;import java.util.*;import java.io.*; public class GFG {    public static void main(String[] argv)    {        try {             // creating the object of KeyStore            // and getting instance            // By using getInstance() method            KeyStore sr = KeyStore.getInstance("JKS");             // Keystore password is required            // to access Keystore            char[] pass = ("123456").toCharArray();             // creating and initializing            // object of InputStream            InputStream is                = new FileInputStream(                    "f:/java/private key.store");             // initializing keystore object            sr.load(is, pass);             // getting the type of default keystore            // using getDefaultType() method            String type                = sr.getDefaultType();             // display the result            System.out.println(                "type of default"                + " keystore entry : "                + type);        }         catch (NoSuchAlgorithmException e) {             System.out.println("Exception thrown : " + e);        }        catch (NullPointerException e) {             System.out.println("Exception thrown : " + e);        }        catch (KeyStoreException e) {             System.out.println("Exception thrown : " + e);        }        catch (FileNotFoundException e) {             System.out.println("Exception thrown : " + e);        }        catch (IOException e) {             System.out.println("Exception thrown : " + e);        }        catch (CertificateException e) {             System.out.println("Exception thrown : " + e);        }    }}
Output:
Example 2: Without loading keystore 
Java
// Java program to demonstrate getDefaultType() method import java.security.*;import java.security.cert.*;import java.util.*;import java.io.*; public class GFG {    public static void main(String[] argv)    {        try {             // creating the object of KeyStore            // and getting instance            // By using getInstance() method            KeyStore sr = KeyStore.getInstance("JKS");             // Keystore password is required            // to access Keystore            char[] pass = ("123456").toCharArray();             // creating and initializing            // object of InputStream            InputStream is                = new FileInputStream(                    "f:/java/private key.store");             // initializing keystore object            // sr.load(is, pass);             // getting the type of default keystore            // using getDefaultType() method            String type                = sr.getDefaultType();             // display the result            System.out.println(                "type of default keystore entry : "                + type);        }        catch (FileNotFoundException e) {             System.out.println("Exception thrown : " + e);        }        catch (NullPointerException e) {             System.out.println("Exception thrown : " + e);        }        catch (KeyStoreException e) {             System.out.println("Exception thrown : " + e);        }    }}
Output:
Reference: https://docs.oracle.com/javase/9/docs/api/java/security/KeyStore.html#getDefaultType– 
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Java-Functions
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