The getProperty() method of java.security.Provider class is used to search for the property with the specified key in this property list. If the key is not found in this property list, the default property list, and its defaults, recursively, are then checked. The method returns null if the property is not found.
Syntax:
public String getProperty(String key)
Parameters: This method takes the property key as parameter.
Return Value: This method returns the value in this property list with the specified key value or null if the property is not found.
Below are the examples to illustrate the getProperty() method:
Example 1:
// Java program to demonstrate// getProperty() method  import java.security.*;import java.util.*;  public class GFG1 {    public static void main(String[] argv) throws Exception    {        // Declaring int values        int i = 10;          try {            // creating the object of KeyPairGenerator            KeyPairGenerator sr = KeyPairGenerator.getInstance("DSA", "SUN");              // getting the Provider of the KeyPairGenerator sr            // by using method getProvider()            Provider provider = sr.getProvider();              // Declaring the variable of set<Map> type            Set<Object> set;              // getting unmodifiable Set view of the property entries            set = provider.keySet();              // Creating the object of iterator to iterate set            Iterator iter = set.iterator();              while (i > 0) {                  // getting the mapped value in element                // using getProperty() method                String property = provider.getProperty((String)iter.next());                  // printing the property of specified key                System.out.println("value is : " + property);                i--;            }        }          catch (NoSuchAlgorithmException e) {              System.out.println("Exception thrown : " + e);        }    }} |
Output:
value is : SHA1withDSA value is : SHA1withDSA value is : SHA1withDSA value is : Software value is : sun.security.provider.JavaKeyStore$DualFormatJKS value is : SHA value is : sun.security.provider.SHA value is : sun.security.provider.JavaKeyStore$CaseExactJKS value is : Software value is : sun.security.provider.DSA$SHA256withDSA
Example 2:
// Java program to demonstrate// getProperty() method  import java.security.*;import java.util.*;  public class GFG1 {    public static void main(String[] argv) throws Exception    {        // Declaring int values        int i = 10;          try {            // creating the object of KeyPairGenerator            KeyPairGenerator sr = KeyPairGenerator.getInstance("DSA", "SUN");              // getting the Provider of the KeyPairGenerator sr            // by using method getProvider()            Provider provider = sr.getProvider();              // getting the mapped value in element            // using getProperty() method            System.out.println("Trying to search for unspecified key");            String property = provider.getProperty("geeks");              // printing the property of specified key            System.out.println("value is : " + property);        }          catch (NoSuchAlgorithmException e) {              System.out.println("Exception thrown : " + e);        }    }} |
Output:
Trying to search for unspecified key value is : null
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