Java Utililty Methods FileInputStream Copy

if (!out.exists()) {
    out.createNewFile();
if (!in.exists()) {
    throw new IllegalArgumentException(in + " does not exist");
FileInputStream fis = new FileInputStream(in);
FileOutputStream fos = new FileOutputStream(out);
...

FileInputStream fis = new FileInputStream(in);
FileOutputStream fos = new FileOutputStream(out);
try {
    byte[] buf = new byte[1024];
    int i = 0;
    while ((i = fis.read(buf)) != -1) {
        fos.write(buf, 0, i);
} catch (Exception e) {
    throw e;
} finally {
    if (fis != null)
        fis.close();
    if (fos != null)
        fos.close();

FileInputStream fis = new FileInputStream(in);
FileOutputStream fos = new FileOutputStream(out);
byte[] buf = new byte[1024];
int i = 0;
while ((i = fis.read(buf)) != -1) {
    fos.write(buf, 0, i);
fis.close();
...

try {
    FileInputStream fis = new FileInputStream(in);
    FileOutputStream fos = new FileOutputStream(out);
    byte[] buf = new byte[1024];
    int i = 0;
    while ((i = fis.read(buf)) != -1) {
        fos.write(buf, 0, i);
    fis.close();
    fos.close();
    return true;
} catch (IOException ie) {
    ie.printStackTrace();
    return false;

FileInputStream fis = new FileInputStream(in);
FileOutputStream fos = new FileOutputStream(out);
try {
    copyStream(fis, fos);
} finally {
    fis.close();
    fos.close();

FileInputStream fis = null;
try {
    fis = new FileInputStream(in);
    copyStreamToFile(fis, out);
} finally {
    if (fis != null) {
        fis.close();

FileInputStream fis = null;
FileOutputStream fos = null;
try {
    fis = new FileInputStream(in);
    fos = new FileOutputStream(out);
    byte[] buf = new byte[1024];
    int i = 0;
    while ((i = fis.read(buf)) != -1) {
...

FileInputStream fis = new FileInputStream(in);
FileOutputStream fos = new FileOutputStream(out);
try {
    copyStream(fis, fos);
} catch (Exception e) {
    throw e;
} finally {
    fis.close();
...

try {
    assert inFile.isFile();
    assert outFile.getParentFile().isDirectory();
    InputStream is = new FileInputStream(inFile);
    copyStreamIntoFile(outFile, is);
    return outFile;
} catch (IOException e) {
    e.printStackTrace();
...

FileInputStream in = null;
FileOutputStream out = null;
boolean success = false;
try {
    in = new FileInputStream(inFile);
    out = new FileOutputStream(outFile);
    byte[] buffer = new byte[BUFFERSIZE];
    int n;
...