Better UI, added LookAndFeel, changed fonts

Lab2/src/main/java/org/lumijiez/enums/Subjects.java

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+package org.lumijiez.enums;
+
+import java.io.Serializable;
+import java.util.Arrays;
+import java.util.List;
+
+public enum Subjects implements Serializable {
+    ENGLISH("English Language", "Eng"),
+    LINEAR_ALGEBRA("Linear Algebra", "AL"),
+    OBJECT_ORIENTED_PROGRAMMING("Object Oriented Programming", "OOP"),
+    DATABASES("Databases", "DB"),
+    MATHEMATICAL_ANALYSIS("Mathematical Analysis", "Mat. Anal"),
+    DISCRETE_MATH("Discrete Math", "MD"),
+    PROBABILITY_AND_STATISTICS("Probability and Statistics", "PSA"),
+    PHYSICS("Physics", "PHYS");
+
+    private final String name;
+
+    private final String abbreviation;
+
+    Subjects(String name, String abbreviation) {
+        this.name = name;
+        this.abbreviation = abbreviation;
+    }
+
+    public static String getAbbrevFromString(String str) {
+        for (Subjects st : values()) {
+            if (st.name.equals(str)) return st.abbreviation;
+        }
+        return str;
+    }
+
+    public static Subjects getEnum(String str) {
+        for (Subjects st : values()) {
+            if (st.name.equals(str)) return st;
+        }
+        return null;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public String getAbbreviation() {
+        return abbreviation;
+    }
+
+    public static List<Subjects> getAllEnums() {
+        return Arrays.asList(values());
+    }
+
+    @Override
+    public String toString() {
+        return getName();
+    }
+}