The getKey() method in org.javatuples is used to fetch the key from the TupleClassObject from the KeyValue Class. This method can be used with only KeyValue class object of javatuples library. It returns a Key which is the element present at the index 0 of the KeyValueClassObject. The returned Key is ensures the type-safety.
Method Declaration:
public A getKey()
Syntax:
KeyValue<A, B> KeyValueClassObject = KeyValue.with(A a, B b); A val = KeyValueClassObject.getKey()
Return Value: This method returns a Key which is the element present at the index 0 of the KeyValueClassObject.
Below programs illustrate the various ways to use getKey() method:
Example 1:
// Below is a Java program to get// a KeyValue value  import java.util.*;import org.javatuples.KeyValue;  class GfG {    public static void main(String[] args)    {        // Creating a KeyValue object        KeyValue<Integer, String> kv            = KeyValue.with(Integer.valueOf(1),                            "Lazyroar");          // Using getKey() method        int key = kv.getKey();          // Printing the Key        System.out.println(key);    }} |
Output:
1
Example 2:
// Below is a Java program to get// a KeyValue value  import java.util.*;import org.javatuples.KeyValue;  class GfG {    public static void main(String[] args)    {        // Creating a KeyValue object        KeyValue<String, String> kv            = KeyValue.with("Lazyroar",                            "A Computer Science Portal for Geeks");          // Using getKey() method        String key = kv.getKey();          // Printing the Key        System.out.println(key);    }} |
Output:
Lazyroar
