diff --git a/Bibliotheksverwaltung/src/DomainLayer/LibraryItem.java b/Bibliotheksverwaltung/src/DomainLayer/LibraryItem.java
index 9c3a0f3..4e67ad1 100644
--- a/Bibliotheksverwaltung/src/DomainLayer/LibraryItem.java
+++ b/Bibliotheksverwaltung/src/DomainLayer/LibraryItem.java
@@ -3,13 +3,46 @@ package DomainLayer;
 import java.time.LocalDate;
 
 public abstract class LibraryItem {
-    private String id;
-    private String title;
-    private String author;
-    private boolean isLoaned;
-    private LocalDate dueDate;
+	private String id;
+	private String title;
+	private String author;
+	private boolean isLoaned;
+	private LocalDate dueDate;
 
-    // Konstruktor und Getter/Setter
-    public abstract int getLoanPeriod();  // Unterschiedliche Fristen für Medien
-    public abstract boolean canRenew();  // Verlängerungsmöglichkeit
-}
+	public LibraryItem(String id, String title, String author) {
+		this.id = id;
+		this.title = title;
+		this.author = author != null ? author : "-";
+		this.isLoaned = false;
+	}
+
+	// Getter und Setter
+	public String getId() {
+		return id;
+	}
+
+	public String getTitle() {
+		return title;
+	}
+
+	public String getAuthor() {
+		return author;
+	}
+
+	public boolean isLoaned() {
+		return isLoaned;
+	}
+
+	public LocalDate getDueDate() {
+		return dueDate;
+	}
+
+	public void setLoaned(boolean loaned, LocalDate dueDate) {
+		this.isLoaned = loaned;
+		this.dueDate = dueDate;
+	}
+
+	public abstract int getLoanPeriod(); // Unterschiedliche Leihfristen
+
+	public abstract boolean canRenew(); // Verlängerbarkeit
+}
\ No newline at end of file