gson work

gson/src/test/java/org/baeldung/gson/serialization/GsonSerializationTest.java

@@ -1,9 +1,11 @@
 package org.baeldung.gson.serialization;
 
 import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertTrue;
 
 import java.lang.reflect.Type;
 import java.util.Collection;
+import java.util.Date;
 
 import org.junit.Test;
 
@@ -61,4 +63,17 @@ public class GsonSerializationTest {
         final String estimatedResult = "{\"intValue\":7}";
         assertEquals(estimatedResult, jsonString);
     }
+
+    @Test
+    public void givenDate_whenSerializing_thenCorrect() {
+        final Date sourceDate = new Date(1000000L);
+        final Gson gson = new Gson();
+        final Type sourceDateType = new TypeToken<Date>() {
+        }.getType();
+        final String jsonDate = gson.toJson(sourceDate, sourceDateType);
+
+        // test
+        final Date testDate = gson.fromJson(jsonDate, sourceDateType);
+        assertTrue(sourceDate.equals(testDate));
+    }
 }

gson/src/test/java/org/baeldung/gson/serialization/SourceClass.java

@@ -1,45 +1,52 @@
 package org.baeldung.gson.serialization;
 
 public class SourceClass {
-    public int intValue;
+    private int intValue;
-    public String stringValue;
+    private String stringValue;
 
     public SourceClass(final int intValue, final String stringValue) {
         this.intValue = intValue;
         this.stringValue = stringValue;
     }
 
-    @Override
+    // API
-    public int hashCode() {
+
-        final int prime = 31;
+    public int getIntValue() {
-        int result = 1;
+        return intValue;
-        result = prime * result + intValue;
-        result = prime * result + ((stringValue == null) ? 0 : stringValue.hashCode());
-        return result;
     }
 
-    @Override
+    public String getStringValue() {
-    public boolean equals(final Object obj) {
+        return stringValue;
-        if (this == obj)
-            return true;
-        if (obj == null)
-            return false;
-        if (getClass() != obj.getClass())
-            return false;
-        final SourceClass other = (SourceClass) obj;
-        if (intValue != other.intValue)
-            return false;
-        if (stringValue == null) {
-            if (other.stringValue != null)
-                return false;
-        } else if (!stringValue.equals(other.stringValue))
-            return false;
-        return true;
     }
 
+    //
+
     @Override
     public String toString() {
         return "SourceClass{" + "intValue=" + intValue + ", stringValue='" + stringValue + '\'' + '}';
     }
 
+    @Override
+    public boolean equals(final Object o) {
+        if (this == o)
+            return true;
+        if (!(o instanceof SourceClass))
+            return false;
+
+        final SourceClass that = (SourceClass) o;
+
+        if (intValue != that.intValue)
+            return false;
+        if (!stringValue.equals(that.stringValue))
+            return false;
+
+        return true;
+    }
+
+    @Override
+    public int hashCode() {
+        int result = intValue;
+        result = 31 * result + stringValue.hashCode();
+        return result;
+    }
 }

gson/src/test/java/org/baeldung/gson/serialization/SourceClassChangingFieldNamesSerializer.java

@@ -15,8 +15,8 @@ public class SourceClassChangingFieldNamesSerializer implements JsonSerializer<S
         final String otherStringValueName = "otherStringValue";
 
         final JsonObject jObject = new JsonObject();
-        jObject.addProperty(otherIntValueName, src.intValue);
+        jObject.addProperty(otherIntValueName, src.getIntValue());
-        jObject.addProperty(otherStringValueName, src.stringValue);
+        jObject.addProperty(otherStringValueName, src.getStringValue());
 
         return jObject;
     }

gson/src/test/java/org/baeldung/gson/serialization/SourceClassIgnoringExtraFieldsSerializer.java

@@ -8,12 +8,11 @@ import com.google.gson.JsonSerializationContext;
 import com.google.gson.JsonSerializer;
 
 public class SourceClassIgnoringExtraFieldsSerializer implements JsonSerializer<SourceClass> {
-
     @Override
     public JsonElement serialize(final SourceClass src, final Type typeOfSrc, final JsonSerializationContext context) {
         final String intValue = "intValue";
         final JsonObject jObject = new JsonObject();
-        jObject.addProperty(intValue, src.intValue);
+        jObject.addProperty(intValue, src.getIntValue());
 
         return jObject;
     }