Implemented UI, fixed serialization inconsistency

Lab2/src/main/java/org/lumijiez/managers/FacultyManager.java

@@ -0,0 +1,45 @@
+package org.lumijiez.managers;
+
+import org.lumijiez.base.Faculty;
+
+import java.io.Serializable;
+import java.util.ArrayList;
+import java.util.List;
+
+public class FacultyManager implements Serializable {
+
+    public FacultyManager(GroupManager gm, StudentManager sm) {
+        this.gm = new GroupManager(sm);
+        this.sm = sm;
+    }
+    private final GroupManager gm;
+    private final StudentManager sm;
+    private final List<Faculty> faculties = new ArrayList<>();
+
+    public Faculty getFaculty(String facultyName, GroupManager gm) {
+        for (Faculty fc : faculties)
+            if (fc.getName().equals(facultyName)) return fc;
+        return null;
+    }
+
+    public void addFaculty(Faculty faculty) {
+        faculties.add(faculty);
+    }
+
+    public void deleteFaculty(Faculty faculty) {
+        faculties.remove(faculty);
+    }
+
+    public List<Faculty> getFaculties() {
+        return faculties;
+    }
+
+    public String getFacultiesText() {
+        StringBuilder builder = new StringBuilder();
+        for (Faculty fc : faculties)
+            builder.append(fc.getName()).append("\n");
+        return builder.toString();
+    }
+
+
+}