Java Object structure dumper (iterative), Java

Java Object structure dumper (iterative)

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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 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 + "  ");                                
                            }
                        }
                    }
                }            
            }
        }
    }
}

[ + ] Show input
Compilation time: 2.88 sec, absolute running time: 0.49 sec, cpu time: 0.41 sec, memory peak: 20 Mb, absolute service time: 3,39 sec

Structure of: Thread name: String value: char[] component type: char hash: int priority: int threadQ: Thread eetop: long single_step: boolean daemon: boolean stillborn: boolean target (abstract): Runnable group: ThreadGroup parent: ThreadGroup name: String maxPriority: int destroyed: boolean daemon: boolean vmAllowSuspension: boolean nUnstartedThreads: int nthreads: int threads: Thread[] component type: Thread ngroups: int groups: ThreadGroup[] component type: ThreadGroup contextClassLoader (abstract): ClassLoader parent (abstract): ClassLoader parallelLockMap: ConcurrentHashMap keySet (abstract): Set values (abstract): Collection table: Node[] component type: Node hash: int key: Object val: Object next: Node nextTable: Node[] component type: Node baseCount: long sizeCtl: int transferIndex: int cellsBusy: int counterCells: CounterCell[] component type: CounterCell value: long keySet: KeySetView map: ConcurrentHashMap value: Object values: ValuesView entrySet: EntrySetView package2certs (abstract): Map classes: Vector modCount: int elementData: Object[] component type: Object elementCount: int capacityIncrement: int defaultDomain: ProtectionDomain codesource: CodeSource location: URL protocol: String host: String port: int file: String query: String authority: String path: String userInfo: String ref: String hostAddress: InetAddress holder: InetAddressHolder originalHostName: String hostName: String address: int family: int canonicalHostName: String handler (abstract): URLStreamHandler hashCode: int tempState: UrlDeserializedState protocol: String host: String port: int authority: String file: String ref: String hashCode: int signers: CodeSigner[] component type: CodeSigner signerCertPath (abstract): CertPath type: String timestamp: Timestamp timestamp: Date fastTime: long cdate (abstract): Date era: Era name: String abbr: String since: long sinceDate (abstract): CalendarDate localTime: boolean hash: int year: int month: int dayOfMonth: int dayOfWeek: int leapYear: boolean hours: int minutes: int seconds: int millis: int fraction: long normalized: boolean zoneinfo (abstract): TimeZone ID: String zoneOffset: int daylightSaving: int forceStandardTime: boolean locale: Locale baseLocale: BaseLocale language: String script: String region: String variant: String hash: int localeExtensions: LocaleExtensions extensionMap (abstract): Map id: String hashCodeValue: int languageTag: String cachedYear: int cachedFixedDateJan1: long cachedFixedDateNextJan1: long signerCertPath (abstract): CertPath myhash: int myhash: int certs: Certificate[] component type (abstract): Certificate type: String hash: int sp: SocketPermission name: String mask: int actions: String hostname: String cname: String addresses: InetAddress[] component type: InetAddress wildcard: boolean init_with_ip: boolean invalid: boolean portrange: int[] component type: int defaultDeny: boolean untrusted: boolean trusted: boolean cdomain: String hdomain: String factory: CertificateFactory type: String provider (abstract): Provider table: Entry[] component type: Entry hash: int key: Object value: Object next: Entry count: int threshold: int loadFactor: float modCount: int keySet (abstract): Set entrySet (abstract): Set values (abstract): Collection defaults: Properties name: String info: String version: double entrySet (abstract): Set entrySetCallCount: int initialized: boolean legacyChanged: boolean servicesChanged: boolean legacyStrings (abstract): Map serviceMap (abstract): Map legacyMap (abstract): Map serviceSet (abstract): Set certFacSpi (abstract): CertificateFactorySpi classloader (abstract): ClassLoader principals: Principal[] component type (abstract): Principal permissions (abstract): PermissionCollection readOnly: boolean hasAllPerm: boolean staticPermissions: boolean key: Key this$0: ProtectionDomain domains (abstract): Set packages: HashMap table: Node[] component type: Node hash: int key: Object value: Object next: Node entrySet (abstract): Set size: int modCount: int threshold: int loadFactor: float nativeLibraries: Vector assertionLock: Object defaultAssertionStatus: boolean packageAssertionStatus (abstract): Map classAssertionStatus (abstract): Map inheritedAccessControlContext: AccessControlContext context: ProtectionDomain[] component type: ProtectionDomain isPrivileged: boolean isAuthorized: boolean privilegedContext: AccessControlContext combiner (abstract): DomainCombiner permissions: Permission[] component type (abstract): Permission parent: AccessControlContext isWrapped: boolean isLimited: boolean limitedContext: ProtectionDomain[] component type: ProtectionDomain threadLocals: ThreadLocalMap table: Entry[] component type: Entry referent: Object queue: ReferenceQueue lock: Lock head (abstract): Reference queueLength: long next (abstract): Reference discovered (abstract): Reference value: Object size: int threshold: int inheritableThreadLocals: ThreadLocalMap stackSize: long nativeParkEventPointer: long tid: long threadStatus: int parkBlocker: Object blocker (abstract): Interruptible blockerLock: Object uncaughtExceptionHandler (abstract): UncaughtExceptionHandler threadLocalRandomSeed: long threadLocalRandomProbe: int threadLocalRandomSecondarySeed: int