feat: Add Driver class and Test Generic Pair.

JavaDsaWithTest/src/main/java/org/practice/dsa/generics/pair/PairTest.java

@@ -0,0 +1,28 @@
+package org.practice.dsa.generics.pair;
+
+public class PairTest {
+    public static void main(String[] args) {
+
+        // Pair for name and age, i.e. of type String and Integer
+        Pair<String, Integer> agePair = new Pair<>("Vishwajeet",24);
+        System.out.println("Name and Age: "+agePair);
+        System.out.println("Name is: "+agePair.getKey());
+        System.out.println("Age is: "+agePair.getValue()+"\n");
+
+        // Pair for Double and Boolean
+        Pair<Double, Boolean> coordinates = new Pair<>(323.2, true);
+        System.out.println("The coordinates are: "+coordinates);
+        System.out.println("Get the coordinates: "+coordinates.getKey());
+        System.out.println("Get Validity: "+coordinates.getValue()+"\n");
+
+        // Pair for String and String
+        Pair<String, String> countryPair = new Pair<>("India", "New Delhi");
+        System.out.println("The country and capital: "+countryPair);
+        System.out.println("The capital is: "+countryPair.getValue());
+
+        // set new value to pair
+        System.out.println();
+        agePair.setValue(25);
+        System.out.println("Age in year 2025 is: "+agePair.getValue());
+    }
+}