docs: Fix code issues in examples/clients/clients.java

examples/clients/GetEmailStatistics.java

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+import com.fasterxml.jackson.databind.JsonNode;
+import com.fasterxml.jackson.databind.ObjectMapper;
+
+import com.sendgrid.*;
+
+import java.io.IOException;
+import java.util.HashMap;
+import java.util.Map;
+
+//////////////////////////////////////////////////////////////////
+// Retrieve email statistics by client type.
+// GET /clients/stats
+
+public class GetEmailStatistics {
+    public static void main(String[] args) throws IOException {
+        try {
+            SendGrid sg = new SendGrid(System.getenv("SENDGRID_API_KEY"));
+            Request request = new Request();
+            request.setMethod(Method.GET);
+            request.setEndpoint("clients/stats");
+            request.addQueryParam("aggregated_by", "day");
+            request.addQueryParam("start_date", "2016-01-01");
+            request.addQueryParam("end_date", "2016-04-01");
+            Response response = sg.api(request);
+            System.out.println(response.getStatusCode());
+            System.out.println(response.getBody());
+            System.out.println(response.getHeaders());
+        } catch (IOException ex) {
+            throw ex;
+        }
+    }
+}

examples/clients/GetEmailStatisticsByClientType.java

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+import com.fasterxml.jackson.databind.JsonNode;
+import com.fasterxml.jackson.databind.ObjectMapper;
+
+import com.sendgrid.*;
+
+import java.io.IOException;
+import java.util.HashMap;
+import java.util.Map;
+
+//////////////////////////////////////////////////////////////////
+// Retrieve stats by a specific client type.
+// GET /clients/{client_type}/stats
+
+public class GetEmailStatisticsByClientType {
+    public static void main(String[] args) throws IOException {
+        try {
+            SendGrid sg = new SendGrid(System.getenv("SENDGRID_API_KEY"));
+            Request request = new Request();
+            request.setMethod(Method.GET);
+            request.setEndpoint("clients/{client_type}/stats");
+            request.addQueryParam("aggregated_by", "day");
+            request.addQueryParam("start_date", "2016-01-01");
+            request.addQueryParam("end_date", "2016-04-01");
+            Response response = sg.api(request);
+            System.out.println(response.getStatusCode());
+            System.out.println(response.getBody());
+            System.out.println(response.getHeaders());
+        } catch (IOException ex) {
+            throw ex;
+        }
+    }
+}

examples/clients/README.md

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+![SendGrid Logo](https://github.com/sendgrid/sendgrid-java/blob/main/twilio_sendgrid_logo.png)
+
+This folder contains various examples on using the CLIENTS endpoint of SendGrid with Java:
+
+* [Retrieve email statistics by client type (GET /clients/stats)](GetEmailStatistics.java)
+* [Retrieve stats by a specific client type (GET /clients/{client_type}/stats)](GetEmailStatisticsByClientType.java)