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Classe Java.util.jar.JarEntry em Java

Esta classe é usada para representar uma entrada de arquivo JAR. Construtores:
    JarEntry(JarEntry comer):Cria um novo JarEntry com campos retirados do objeto JarEntry especificado. JarEntry(nome da string):Cria um novo JarEntry para o nome de entrada do arquivo JAR especificado. JarEntry(ZipEntry com):Cria um novo JarEntry com campos retirados do objeto ZipEntry especificado.
Métodos:
    Atributos 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
    Certificado[] 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.
Métodos herdados da classe java.util.zip.ZipEntry clone getComment getCompressedSize getCrc getExtra getMethod getName getSize getTime hashCode isDirectory setComment setCompressedSize setCrc setExtra setMethod setSize setTime toString Métodos herdados da classe java.lang.Object equals finalize getClass notify notifyAll wait wait wait Nota: Os programas não serão executados no IDE online porque não são capazes de ler o arquivo 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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