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Classe Java.util.jar.JarEntry a Java

Aquesta classe s'utilitza per representar una entrada de fitxer JAR. Constructors:
    JarEntry (Menjar JarEntry):Crea un nou JarEntry amb camps extrets de l'objecte JarEntry especificat. JarEntry (nom de la cadena):Crea una nova JarEntry per al nom de l'entrada del fitxer JAR especificat. JarEntry (ZipEntry amb):Crea un JarEntry nou amb camps extrets de l'objecte ZipEntry especificat.
Mètodes:
    Atributs getAttributes(): Returns the Manifest Attributes for this entry or null if none. 
      Syntax :  public Attributes getAttributes() throws IOException   Returns:   the Manifest Attributes for this entry or null if none
    Certificat[] getCertificates(): Returns the Certificate objects for this entry or null if none. 
      Syntax :  public Certificate[] getCertificates()   Returns:   the Certificate objects for this entry or null if none.
    CodeSigner[] getCodeSigners() : Returns the CodeSigner objects for this entry or null if none. 
      Syntax :  public CodeSigner[] getCodeSigners()   Returns:   the CodeSigner objects for this entry or null if none.
Mètodes heretats de la classe java.util.zip.ZipEntry clone getComment getCompressedSize getCrc getExtra getMethod getName getSize getTime hashCode isDirectory setComment setCompressedSize setCrc setExtra setMethod setSize setTime toString Mètodes heretats de la classe java.lang.Object és igual a finalize getClass notify notifyAll wait wait wait Nota: els programes no s'executaran a l'IDE en línia ja que no poden llegir el fitxer Programa 1: Java 
//Java program demonstrating JarEntry method import java.io.FileInputStream; import java.io.IOException; import java.io.PrintStream; import java.util.jar.JarEntry; import java.util.jar.JarInputStream; class JarEntryDemo {  public static void main(String[] args) throws IOException   {  FileInputStream fis = new FileInputStream('codechecker.jar');  JarInputStream jis = new JarInputStream(fis);  JarEntry je=jis.getNextJarEntry();  PrintStream out = System.out;  //illustrating getAttributes  out.println(je.getAttributes());  //illustrating getCodeSigner  out.println(je.getCodeSigners());  //illustrating getCertificates  out.println(je.getCertificates());  } }
Programa 2: Java 
//Java program demonstrating JarEntry method package java.util.jar;    import java.io.IOException;  import java.util.zip.ZipEntry;  import java.security.CodeSigner;  import java.security.cert.Certificate;  public class JarEntry extends ZipEntry  {  Attributes attr;  Certificate[] certs;  CodeSigner[] signers;    public JarEntry(String name)   {  super(name);  }    public JarEntry(ZipEntry ze)   {  super(ze);  }    public JarEntry(JarEntry je)  {  this((ZipEntry)je);  this.attr = je.attr;  this.certs = je.certs;  this.signers = je.signers;  }    public Attributes getAttributes() throws IOException   {  return attr;  }    public Certificate[] getCertificates()   {  return certs == null ? null : (Certificate[]) certs.clone();  }    public CodeSigner[] getCodeSigners()     {  return signers == null ? null : (CodeSigner[]) signers.clone();  } }
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