Java Utililty Methods FileInputStream Copy

InputStream in;
OutputStream out;
if (pathOrig == null || pathDst == null) {
    System.err.println("Error en path");
    return;
File orig = new File(pathOrig);
if (!orig.exists() || !orig.isFile() || !orig.canRead()) {
...

if ((new File(quelle)).equals(new File(ziel))) {
    return false; 
final int BUFSIZE = 4096;
FileInputStream f1;
FileOutputStream f2;
byte[] buf = new byte[BUFSIZE];
int n;
...

return copyFile(new File(resourceFimeName), new File(targetFileName));

FileInputStream fileinputstream = null;
FileOutputStream fileoutputstream = null;
try {
    fileinputstream = new FileInputStream(s);
    fileoutputstream = new FileOutputStream(s1);
    int j;
    byte abyte0[] = new byte[1024];
    do {
...

copyFile(new File(source), new File(dest));

try {
    File f1 = new File(source);
    File f2 = new File(destination);
    InputStream in = new FileInputStream(f1);
    OutputStream out = new FileOutputStream(f2);
    byte[] buf = new byte[1024];
    int len;
    while ((len = in.read(buf)) > 0) {
...

InputStream inStream = null;
OutputStream outStream = null;
boolean isSucceed = false;
try {
    File desFile = new File(destination);
    File srcFile = new File(source);
    inStream = new FileInputStream(srcFile);
    outStream = new FileOutputStream(desFile);
...

File src = new File(source);
File dest = new File(destination);
if (!src.isFile())
    throw new IOException("SubAccount " + src + "is not a file");
if (!src.canRead())
    throw new IOException("SubAccount " + src + "is unreadable");
File newDir = new File(destination.substring(0, destination.lastIndexOf(File.separator)));
if (!newDir.exists()) {
...

copyFile(new File(source), new File(destination));

boolean isSuc = false;
InputStream in = null;
FileOutputStream out = null;
try {
    int bytesum = 0;
    int byteread = 0;
    File oldfile = new File(source);
    newFile(target);
...