public JarFile(String name) throws IOException 
{
                                                                      
        this(new File(name), true, ZipFile.OPEN_READ);
}

Creates a new JarFile to read from the specified file name. The JarFile will be verified if it is signed.

Parameters:

name - the name of the jar file to be opened for reading

Throws:

IOException - if an I/O error has occurred

SecurityException - if access to the file is denied by the SecurityManager

 public JarFile(File file) throws IOException 
{
        this(file, true, ZipFile.OPEN_READ);
}

Creates a new JarFile to read from the specified File object. The JarFile will be verified if it is signed.

Parameters:

file - the jar file to be opened for reading

Throws:

IOException - if an I/O error has occurred

SecurityException - if access to the file is denied by the SecurityManager

 public JarFile(String name,
    boolean verify) throws IOException 
{
        this(new File(name), verify, ZipFile.OPEN_READ);
}

Creates a new JarFile to read from the specified file name.

Parameters:

name - the name of the jar file to be opened for reading

verify - whether or not to verify the jar file if it is signed.

Throws:

IOException - if an I/O error has occurred

SecurityException - if access to the file is denied by the SecurityManager

 public JarFile(File file,
    boolean verify) throws IOException 
{
        this(file, verify, ZipFile.OPEN_READ);
}

Creates a new JarFile to read from the specified File object.

Parameters:

file - the jar file to be opened for reading

verify - whether or not to verify the jar file if it is signed.

Throws:

IOException - if an I/O error has occurred

SecurityException - if access to the file is denied by the SecurityManager.

 public JarFile(File file,
    boolean verify,
    int mode) throws IOException 
{
        super(file, mode);
        this.verify = verify;
}

Creates a new JarFile to read from the specified File object in the specified mode. The mode argument must be either OPEN_READ or OPEN_READ | OPEN_DELETE.

Parameters:

file - the jar file to be opened for reading

verify - whether or not to verify the jar file if it is signed.

mode - the mode in which the file is to be opened

Throws:

IOException - if an I/O error has occurred

IllegalArgumentException - if the mode argument is invalid

SecurityException - if access to the file is denied by the SecurityManager

since: 1.3 -

 public Enumeration entries() 
{
        final Enumeration enum_ = super.entries();
        return new Enumeration< JarEntry >() {
            public boolean hasMoreElements() {
                return enum_.hasMoreElements();
            }
            public JarFileEntry nextElement() {
                ZipEntry ze = (ZipEntry)enum_.nextElement();
                return new JarFileEntry(ze);
            }
        };
}

Returns an enumeration of the zip file entries.

 public ZipEntry getEntry(String name) 
{
        ZipEntry ze = super.getEntry(name);
        if (ze != null) {
            return new JarFileEntry(ze);
        }
        return null;
}

Returns the ZipEntry for the given entry name or null if not found.

 public synchronized InputStream getInputStream(ZipEntry ze) throws IOException 
{
        maybeInstantiateVerifier();
        if (jv == null) {
            return super.getInputStream(ze);
        }
        if (!jvInitialized) {
            initializeVerifier();
            jvInitialized = true;
            // could be set to null after a call to
            // initializeVerifier if we have nothing to
            // verify
            if (jv == null)
                return super.getInputStream(ze);
        }
        // wrap a verifier stream around the real stream
        return new JarVerifier.VerifierStream(
            getManifestFromReference(),
            ze instanceof JarFileEntry ?
            (JarEntry) ze : getJarEntry(ze.getName()),
            super.getInputStream(ze),
            jv);
}

Returns an input stream for reading the contents of the specified zip file entry.

 public JarEntry getJarEntry(String name) 
{
        return (JarEntry)getEntry(name);
}

Returns the JarEntry for the given entry name or null if not found.

 public Manifest getManifest() throws IOException 
{
        return getManifestFromReference();
}

Returns the jar file manifest, or null if none.

 boolean hasClassPathAttribute() throws IOException 
{
        if (computedHasClassPathAttribute) {
            return hasClassPathAttribute;
        }
        hasClassPathAttribute = false;
        if (!isKnownToNotHaveClassPathAttribute()) {
            JarEntry manEntry = getManEntry();
            if (manEntry != null) {
                byte[] b = new byte[(int)manEntry.getSize()];
                DataInputStream dis = new DataInputStream(
                                                          super.getInputStream(manEntry));
                dis.readFully(b, 0, b.length);
                dis.close();
                int last = b.length - src.length;
                int i = 0;
                next:
                while (i< =last) {
                    for (int j=9; j >=0; j--) {
                        char c = (char) b[i+j];
                        c = (((c-'A")|('Z"-c))  >= 0) ? (char)(c + 32) : c;
                        if (c != src[j]) {
                            i += Math.max(j + 1 - lastOcc[c&0x7F], optoSft[j]);
                            continue next;
                        }
                    }
                    hasClassPathAttribute = true;
                    break;
                }
            }
        }
        computedHasClassPathAttribute = true;
        return hasClassPathAttribute;
}