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src/TestingSystem/Common/Group/Json/GroupJson.java

@@ -0,0 +1,16 @@
+package TestingSystem.Common.Group.Json;
+import TestingSystem.Common.Group.Group;
+import com.google.gson.annotations.Expose;
+
+import java.io.Serializable;
+public class GroupJson implements Serializable {
+    @Expose
+    public int id;
+    @Expose
+    public String description;
+    public GroupJson(Group group){
+        id=group.id;
+        description= group.description;
+    }
+    public GroupJson(){}
+}

src/TestingSystem/Common/Group/Json/GroupsJson.java

@@ -0,0 +1,19 @@
+package TestingSystem.Common.Group.Json;
+import TestingSystem.Common.Group.Group;
+import com.google.gson.annotations.Expose;
+
+import java.io.Serializable;
+import java.util.List;
+import java.util.Vector;
+public class GroupsJson implements Serializable {
+    @Expose
+    public List<GroupJson> array = new Vector<>();
+    public GroupsJson() {
+    }
+    //при создании пакета.
+    public GroupsJson(Vector<Group> groups) {
+        array = new Vector<>();
+        for (Group group : groups)
+            array.add(new GroupJson(group));
+    }
+}