i cant understand. who can help me
package com.codegym.task.task15.task1505;
import javax.print.DocFlavor;
import java.util.ArrayList;
import java.util.List;
public class Solution {
public static interface LivingPart {
Object containsBones();
}
public static class BodyPart implements LivingPart {
private String name;
public BodyPart(String name) {
this.name = name;
}
public Object containsBones() {
return "Yes";
}
public String toString() {
String visszater = null;
containsBones().equals("Yes") ? visszater = name + " contains bones" : visszater = name + " does not contain bones"; }
}
public static class Finger extends BodyPart {
private boolean isArtificial;
public Finger(String name, boolean isArtificial) {
super(name);
this.isArtificial = isArtificial;
}
public String containsBones() {
if (super.containsBones() == "Yes" && !isArtificial)
return "Yes";
return "No";
}
}
public static void main(String[] args) {
printlnFingers();
printlnBodyParts();
printlnLivingParts();
}
private static void printlnLivingParts() {
if(new BodyPart("Hand").containsBones().equals("Yes"))
System.out.println("Yes");
else
System.out.println("No");
}
private static void printlnBodyParts() {
List<BodyPart> bodyParts = new ArrayList<BodyPart>(5);
bodyParts.add(new BodyPart("Hand"));
bodyParts.add(new BodyPart("Leg"));
bodyParts.add(new BodyPart("Head"));
bodyParts.add(new BodyPart("Body"));
System.out.println(bodyParts.toString());
}
private static void printlnFingers() {
List<Finger> fingers = new ArrayList<Finger>(5);
fingers.add(new Finger("Thumb", true));
fingers.add(new Finger("Forefinger", true));
fingers.add(new Finger("Middle finger", true));
fingers.add(new Finger("Ring-finger", true));
fingers.add(new Finger("Pinky", true));
System.out.println(fingers.toString());
}
}