Java Object structure dumper (iterative), Java

Java Object structure dumper (iterative)

//'main' method must be in a class 'Rextester'.
//Compiler version 1.8.0_111

import java.util.*;
import java.lang.*;
import java.lang.reflect.*;

class Rextester
{  
    public static void main(String args[]) throws Exception
    {
        dump(new Thread());
    }
    
    public static void dump(Object o){
        Stack<Class<?>> stack = new Stack<>();
        Stack<String> descr = new Stack<>();
        Stack<String> tabs = new Stack<>();
        HashSet<Field> printed = new HashSet<>();
        
        stack.push(o.getClass());
        descr.push("Structure of: ");
        tabs.push("");
        
        while(!stack.isEmpty()){
            Class<?> current = stack.pop();
            String currentTabs = tabs.pop();
            System.out.println(currentTabs + descr.pop() + current.getSimpleName());
            //done.forEach(System.out::println);
            //System.out.println();
            
            if(current != null){
                if(current.isArray()){
                    stack.push(current.getComponentType());
                    descr.push("component type" + ((current.getComponentType().isInterface() ||
                                                   !current.getComponentType().isPrimitive()) &&
                                                   Modifier.isAbstract(current.getComponentType().getModifiers())? " (abstract)" : "") + ": ");
                    tabs.push(currentTabs + "  ");                     
                }
                else for(Class<?> c = current; c != null && !c.equals(Object.class); c = c.getSuperclass()){
                    Field[] fields = c.getDeclaredFields();
                    for(int i = fields.length-1; i >= 0; i--){
                        Field field = fields[i];
                        if(!Modifier.isStatic(field.getModifiers())){
                            if(printed.add(field)){
                                stack.push(field.getType());
                                descr.push(field.getName() + ((field.getType().isInterface() ||
                                                              !field.getType().isPrimitive()) &&
                                                              !field.getType().isArray() &&
                                                              Modifier.isAbstract(field.getType().getModifiers())? " (abstract)" : "") + ": ");
                                tabs.push(currentTabs + "  ");                                
                            }
                        }
                    }
                }            
            }
        }
    }
}


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