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diff --git a/sem5/oop/m1/notes.md b/sem5/oop/m1/notes.md
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+# Introduction
+
+## Interfaces
+
+Abstract class used to define object API.
+
+Classes can then implement this API.
+
+```
+public interface Car {
+    public void turn(blabla);
+    blabla;
+}
+```
+
+### Polymorphism
+
+Most general interface is Object (like golangs interface{} ? ).
+
+## Encapsulations
+
+Hide internal details.
+This can be done with getters and setters.
+
+These getters and setters can then be used to to input validation.
+
+## Private vs protected
+
+Protected are accessible to subclasses which inherit from it.
diff --git a/sem5/oop/m1/src/Main.java b/sem5/oop/m1/src/Main.java
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+
+public class Main {
+	public static void main(String[] args) {
+		Student std = new Student("Julian", (short)21, "Male", (long)123213213, "COMTEK");
+		Uniperson hej = std;
+		
+		hej.addGPA(0.32);
+		hej.addGPA(12);
+		
+		System.out.printf("deg: %s, sem: %d, avg: %f\n", hej.getDeg(), hej.getSem(), hej.avgGPA());
+		
+		System.out.printf("person: %s\n", std);
+	}
+}
diff --git a/sem5/oop/m1/src/Person.java b/sem5/oop/m1/src/Person.java
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+
+public class Person {
+	protected String name;
+	protected String gender;
+	protected short age;
+	
+	public Person(String name, String gender, short age) {
+		this.name = name.equals("Victor") ? "Viktor" : name;
+		this.gender = gender;
+		this.age = age;
+	}
+
+	public String toString() {
+		return String.format("%s[gen: %s, age: %d]", name, gender, age);
+	}
+}
diff --git a/sem5/oop/m1/src/Student.java b/sem5/oop/m1/src/Student.java
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+public class Student extends Person implements Uniperson {
+	// Yes, we do support very long educations
+	private long semester;
+	private String degree;
+
+	private double GPA;
+	private int GPAcount;
+	
+	public Student(String name, short age, String gender, long semester, String degree) {
+		super(name, gender, age);
+		this.semester = semester;
+		this.degree = degree;
+		this.GPA = 0;
+		this.GPAcount = 0;
+	}
+	
+	public void addGPA(double GPA) {
+		this.GPA += GPA;
+		this.GPAcount++;
+	}
+
+	public long getSem() {
+		return this.semester;
+	}
+	
+	public String getDeg() {
+		return this.degree;
+	}
+	
+	public double avgGPA() {
+		if (this.GPAcount == 0) {
+			return 0;
+		}
+		return this.GPA / this.GPAcount;
+	}
+}
diff --git a/sem5/oop/m1/src/Uniperson.java b/sem5/oop/m1/src/Uniperson.java
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+
+public interface Uniperson {
+	public long getSem();
+	public String getDeg();
+	public double avgGPA();
+	public void addGPA(double GPA);
+}