From 7c4744777605be0e2c89d2825853257fbad73a3e Mon Sep 17 00:00:00 2001
From: Bahaa El-Din Helmy <bahaavampire@yahoo.com>
Date: Sat, 20 May 2023 19:00:00 +0300
Subject: [PATCH] Convert Hashmap to JSON object in Java (#14070)

* Convert Hashmap to JSON object in Java

This commit is related to the article entitled "Convert Hashmap to JSON object in Java"

* Convert Hashmap to JSON object in Java

This commit is for the article "Convert Hashmap to JSON object in Java"
---
 .../core-java-collections-maps-6/pom.xml      | 34 ++++++++++
 .../baeldung/maptojson/MapToJsonUnitTest.java | 65 +++++++++++++++++++
 2 files changed, 99 insertions(+)
 create mode 100644 core-java-modules/core-java-collections-maps-6/src/test/java/com/baeldung/maptojson/MapToJsonUnitTest.java

diff --git a/core-java-modules/core-java-collections-maps-6/pom.xml b/core-java-modules/core-java-collections-maps-6/pom.xml
index 70a04c352b..8c35dcee6e 100644
--- a/core-java-modules/core-java-collections-maps-6/pom.xml
+++ b/core-java-modules/core-java-collections-maps-6/pom.xml
@@ -16,5 +16,39 @@
     <properties>
         <spring.version>5.2.5.RELEASE</spring.version>
     </properties>
+    <dependencies>
+        <dependency>
+            <groupId>com.fasterxml.jackson.core</groupId>
+            <artifactId>jackson-databind</artifactId>
+            <version>2.13.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.openjdk.jmh</groupId>
+            <artifactId>jmh-core</artifactId>
+            <version>1.36</version>
+        </dependency>
+        <dependency>
+            <groupId>com.google.code.gson</groupId>
+            <artifactId>gson</artifactId>
+            <version>2.8.9</version>
+        </dependency>
+        <dependency>
+            <groupId>org.json</groupId>
+            <artifactId>json</artifactId>
+            <version>20230227</version>
+        </dependency>
+        <dependency>
+            <groupId>junit</groupId>
+            <artifactId>junit</artifactId>
+            <version>4.13.1</version>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.junit.jupiter</groupId>
+            <artifactId>junit-jupiter</artifactId>
+            <version>5.8.1</version>
+            <scope>test</scope>
+        </dependency>
+    </dependencies>
 
 </project>
\ No newline at end of file
diff --git a/core-java-modules/core-java-collections-maps-6/src/test/java/com/baeldung/maptojson/MapToJsonUnitTest.java b/core-java-modules/core-java-collections-maps-6/src/test/java/com/baeldung/maptojson/MapToJsonUnitTest.java
new file mode 100644
index 0000000000..7a9f046a94
--- /dev/null
+++ b/core-java-modules/core-java-collections-maps-6/src/test/java/com/baeldung/maptojson/MapToJsonUnitTest.java
@@ -0,0 +1,65 @@
+package com.baeldung.maptojson;
+
+import com.fasterxml.jackson.core.JsonProcessingException;
+import com.fasterxml.jackson.databind.ObjectMapper;
+import com.google.gson.Gson;
+import com.google.gson.JsonElement;
+import com.google.gson.JsonSyntaxException;
+import com.google.gson.TypeAdapter;
+import com.google.gson.reflect.TypeToken;
+import org.json.JSONObject;
+import org.junit.Test;
+import org.junit.jupiter.api.Assertions;
+
+import java.io.IOException;
+import java.lang.reflect.Type;
+import java.util.HashMap;
+import java.util.Map;
+
+public class MapToJsonUnitTest {
+    final TypeAdapter<JsonElement> strictAdapter = new Gson().getAdapter(JsonElement.class);
+
+    public boolean isValid(String json) {
+        try {
+            strictAdapter.fromJson(json);
+        } catch (JsonSyntaxException | IOException e) {
+            return false;
+        }
+        return true;
+    }
+
+    @Test
+    public void given_HashMapData_whenUsingJackson_thenConvertToJson() throws JsonProcessingException {
+        Map<String, String> data = new HashMap();
+        data.put("CS", "Post1");
+        data.put("Linux", "Post1");
+        data.put("Kotlin", "Post1");
+        ObjectMapper objectMapper = new ObjectMapper();
+        String jacksonData = objectMapper.writeValueAsString(data);
+        Assertions.assertTrue(isValid(jacksonData));
+    }
+
+    @Test
+    public void given_HashMapData_whenUsingGson_thenConvertToJson() {
+        Map<String, String> data = new HashMap<>();
+        data.put("CS", "Post1");
+        data.put("Linux", "Post1");
+        data.put("Kotlin", "Post1");
+        Gson gson = new Gson();
+        Type typeObject = new TypeToken<HashMap>() {
+        }.getType();
+        String gsonData = gson.toJson(data, typeObject);
+        Assertions.assertTrue(isValid(gsonData));
+    }
+
+    @Test
+    public void given_HashMapData_whenOrgJson_thenConvertToJsonUsing() {
+        Map<String, String> data = new HashMap<>();
+        data.put("CS", "Post1");
+        data.put("Linux", "Post1");
+        data.put("Kotlin", "Post1");
+        JSONObject jsonObject = new JSONObject(data);
+        String orgJsonData = jsonObject.toString();
+        Assertions.assertTrue(isValid(orgJsonData));
+    }
+}
\ No newline at end of file