ls.java

用command模式写的一个简单的java 程序

/******************************************************************************
*  Filename    :ls.java
*  Description :ls command
*
*  Author      :xunzy
*
*  History     :2004-02-16   Created
******************************************************************************/
import java.util.Vector;
import java.io.*;

public class ls implements Command {
  public void execute(File c, Vector v) throws CommandException {
                
    // Check for current dir; throw an exception if there is null
    if (FileSystemShell.getCurrentDir() == null)
      throw new CommandException(new Exception(), 
        "Error: no current context.");

    // Call list() and then loop through the results, printing the names
      String[] enum = c.list();
      int i=0;                
      while (i<enum.length) {
        System.out.println(enum[i]);
        i++;
      }
  }

  public void help() { System.out.println("Usage: list [dirName]"); }
}