Java Utililty Methods File Delete

if (null == file)
    throw new IllegalArgumentException("Illegal 'file' argument in Utils.delete(File): " + file);
if (file.exists()) {
    if (file.isDirectory()) {
        for (File child : file.listFiles()) {
            delete(child);
    file.delete();

if (file.isDirectory()) {
    deleteChildren(file);
deleteFile(file);

if (file == null) {
    return;
if (file.isDirectory()) {
    String files[] = file.list();
    if (files != null) {
        if (files.length != 0) {
            for (String temp : files) {
...

if (!file.exists())
    return;
if (file.isDirectory()) {
    if (file.list().length == 0) {
        file.delete();
    } else {
        String files[] = file.list();
        for (String temp : files) {
...

if (file.isDirectory()) {
    File[] files = file.listFiles();
    for (File file2 : files)
        delete(file2);
if (!file.delete())
    throw new RuntimeException("Failed to delete file: " + file);

if (file.isDirectory()) {
    File[] entries = file.listFiles();
    if (entries != null) {
        for (File entry : entries) {
            if (!delete(entry)) {
                return false;
return file.delete();

if (file != null && file.exists()) {
    boolean deleted = file.delete();
    if (!deleted) {
        file.deleteOnExit();

if (writeable(file)) {
    if (file.isDirectory()) {
        for (File f : file.listFiles())
            delete(f);
    file.delete();

try {
    file.delete();
} catch (Exception e) {
    throw new Exception(file.toString() + ": Can't delete");

if (file != null && file.exists()) {
    if (file.isDirectory()) {
        for (File child : file.listFiles()) {
            delete(child);
    return file.delete();
} else {
...