Added code to add new partitions in kafka topic (#18296)

Co-authored-by: amijkum <[email protected]>

Author: amit88265

apache-kafka-3/src/main/java/com/baeldung/kafka/KafkaAddPartitionExample.java

@@ -0,0 +1,23 @@
+package com.baeldung.kafka;
+
+import java.util.Collections;
+import java.util.Properties;
+
+import org.apache.kafka.clients.admin.AdminClient;
+import org.apache.kafka.clients.admin.NewPartitions;
+
+public class KafkaAddPartitionExample {
+
+    public static void main(String[] args) {
+        Properties props = new Properties();
+        props.put("bootstrap.servers", "localhost:9092");
+        try (AdminClient adminClient = AdminClient.create(props)) {
+            adminClient.createPartitions(Collections.singletonMap("my-topic", NewPartitions.increaseTo(3)))
+                .all()
+                .get();
+        } catch (Exception e) {
+            throw new RuntimeException(e);
+        }
+    }
+
+}