Java Object Graph Dumper (iterative), Java

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//'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 String NEWLINE = String.format("%n");
    
    public static void main(String args[])
    {
        try{
            System.out.println(dumpClass(Class.forName(new Scanner(System.in).nextLine())));
        }catch(ClassNotFoundException e){
            e.printStackTrace();
        }
        
    }
    
    public static String dumpClass(Class<?> c){
        
        TreeMap<Class<?>, String> content = new TreeMap<>((c1, c2) -> c1.getSimpleName().compareTo(c2.getSimpleName()));
        HashSet<Class<?>> visited = new HashSet<>();
        Stack<Class<?>> toVisit = new Stack<>();
        
        visited.add(Object.class);
        visited.add(Integer.class);
        visited.add(Boolean.class);
        visited.add(Double.class);
        visited.add(Byte.class);
        visited.add(String.class);
        visited.add(Short.class);
        visited.add(Long.class);
        visited.add(Character.class);
        visited.add(Float.class);
        visited.add(int.class);
        visited.add(boolean.class);
        visited.add(double.class);
        visited.add(byte.class);
        visited.add(short.class);
        visited.add(long.class);
        visited.add(float.class);
        visited.add(char.class);
        
        toVisit.push(c);
        visited.add(c);
        
        while(!toVisit.isEmpty()){
            Class<?> current = toVisit.pop();
            StringBuilder sb = new StringBuilder();
            
            if(current.isInterface()) sb.append(current + NEWLINE);
            else{
                
                sb.append(current + ":" + NEWLINE);
                for(Class<?> temp = current; temp != null && !temp.equals(Object.class); temp = temp.getSuperclass()){
                    sb.append(String.format(">> " + (temp == current? "this" : "superclass " + temp.getName()) + ":%n"));
                    
                    for(Field f : temp.getDeclaredFields()){

if(!Modifier.isStatic(f.getModifiers()) && !f.isSynthetic()){

Class<?> toAdd = f.getType();
                            while(toAdd.isArray()) toAdd = toAdd.getComponentType();

if(visited.add(toAdd)){
                            	toVisit.push(toAdd);
                            }

sb.append("    ").append(f.getName()).append(": ").append(f.getType().getSimpleName()).append(String.format("%n"));

}

}
            
            }
            
            sb.append(NEWLINE + NEWLINE);
            content.put(current, sb.toString());
            
        }
        
        StringBuilder text = new StringBuilder();
        text.append(content.get(c));
        content.remove(c);
        content.forEach((arg1, arg2) -> text.append(arg2));
        
        
        return text.toString();
            
    }
}

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Compilation time: 1.14 sec, absolute running time: 0.59 sec, cpu time: 0.82 sec, memory peak: 26 Mb, absolute service time: 1,74 sec