Update

Bookcase.java

@@ -24,10 +24,10 @@ public class Bookcase extends Furniture{
 	public String chooseCategory() {
 		String aCategory="";
 		 if(this.getCategory()==1) {
-			 return aCategory ="Plastic";
+			 aCategory ="Plastic";
 		 }
 		 else if(this.getCategory()==2) {
-			 return aCategory = "Metallic";
+			 aCategory = "Metallic";
 		 }else if(this.getCategory()==3) {
 			 aCategory = "Wooden";
 		 }
@@ -39,8 +39,7 @@ public class Bookcase extends Furniture{
 	}
 	
 	public String getInfo() {
-		super.getInfo();
+		return super.getInfo() + "Shelves: "+this.getShelves();
-		return "Shelves: "+this.getShelves();
 	}
 
 	

Chair.java

@@ -28,7 +28,7 @@ public class Chair extends Furniture{
 			 return aCategory ="Office chair";
 		 }
 		 else if(this.getCategory()==2) {
-			 return aCategory = "Cooperation Chair";
+			 return aCategory = "Cooperation chair";
 		 }else if(this.getCategory()==3) {
 			 aCategory = "Armchair";
 		 }
@@ -36,7 +36,6 @@ public class Chair extends Furniture{
 	}
 	
 	public String getInfo() {
-		super.getInfo();
+		return super.getInfo() + "Fabric color: "+this.getColor();
-		return "Shelves: "+this.getColor();
 	}
 }

Furniture.java

@@ -38,7 +38,7 @@ public abstract class Furniture implements Comparable{
 		return model;
 	}
 	public String getInfo() {
-		return "-"+this.getClass()+"info:\n"+
+		return "- "+this.getClass().getName()+" info:\n"+
 				this.getModel()+", "+this.calculatePrice()+" Euro: \n"+
 				"Category: "+this.chooseCategory()+"\n"+
 				"Weight: "+this.getWeight()+"\n";

FurnitureCompany.java

@@ -17,5 +17,8 @@ public class FurnitureCompany{
 		return this.allFurniture;
 	}
 	
+	public void addFurniture(Furniture furniture) {
+		allFurniture.add(furniture);
+	}
 	
 }

FurnitureFrame.java

@@ -42,15 +42,18 @@ public class FurnitureFrame extends JFrame{
 			@Override
 			public void actionPerformed(ActionEvent e) {
 				String modelName =t1.getText();
+				boolean found = false;
 				for(Furniture furniture: allFurniture) {
 					if(furniture.getModel().equals(modelName)) {
-					     furniture.getInfo(); 
+					     found = true;
+					     System.out.println(furniture.getInfo());
+					     break;
 					}
-					else {
+				}
+				if(!found) {
 					System.out.println("There is no furniture of model "+modelName);
 				}
 			}
-			}
 		});
 		
 		b2.addActionListener(new ActionListener() {
@@ -64,11 +67,11 @@ public class FurnitureFrame extends JFrame{
 					FileWriter write = new FileWriter(f);
 					for(Furniture furniture:furnitures) {
 						if(furniture.chooseCategory().equals(textCategory)) {
-						
 							write.write(furniture.getInfo());
-							write.write(System.lineSeparator());
+							for(int i=0; i<2; i++) write.write(System.lineSeparator());
 						}
 					}
+					write.close();
 				} catch (IOException e1) {
 					// TODO Auto-generated catch block
 					e1.printStackTrace();

Main.java

@@ -8,7 +8,11 @@ public class Main {
 		Furniture c1 = new Chair("HermanMiller",40,2,"Grey");
 		FurnitureCompany bestFurniture = new FurnitureCompany(b1,c1);
 		
+		bestFurniture.addFurniture(b1);
+		bestFurniture.addFurniture(c1);
+		
 		new FurnitureFrame(bestFurniture.getAllFurnitures());
+		
 	}
 
 }