Pls help

Compare your solution to mine: public class Solution { public static void main(String[] args) { Tree tree = new Tree("willow", new String[]{"s1", "s2", "s3", "s4"}); Tree clone = null; try { clone = (Tree) tree.clone(); } catch (CloneNotSupportedException e) { e.printStackTrace(); } System.out.println(tree); System.out.println(clone); System.out.println(tree.branches); System.out.println(clone.branches); } public static class Plant{ private String name; public Plant(String name) { this.name = name; } public String getName() { return name; } } public static class Tree extends Plant implements Cloneable { private String[] branches; public Tree(String name, String[] branches) { super(name); this.branches = branches; } public String[] getBranches() { return branches; } @Override protected Object clone() throws CloneNotSupportedException { Tree tree = (Tree) super.clone(); tree.branches = branches.clone(); return tree; } } }

You cannot cloned plant ...look at your Object.equals method..???

Plant is not cloneable, so line 64 won't work. However you could create a new Tree object (inside the clone method) and then clone the branches.