如何获知一个目录是否为空？

Question

File file = new File("d:/websrc");                            
if(file.exists()){                                            
if(file.isDirectory() ){                                  
if(file.list().length<=0){                            
System.out.println("the directory is empty");     
}else{                                                
System.out.println("the directory is not empty"); 
}                                                     
}else{                                                    
System.out.println("it is not a directory");          
}                                                         
}else{                                                        
System.out.println("the file is not exist");              
}                                                             

Answer 1

完整的例子：
import java.io.*;public class isDirectory{
public static void main(String[] args){
File file=new File("d:/websrc");
if(file.exists()){
if(file.isDirectory()){
if(file.list().length<=0){
System.out.println("the directory is empty");
}else{
System.out.println("the directory is not empty");
}
}
else{
System.out.println("it is not a directory");
}
}
else{
System.out.println("the directory is not exist");
}
}
}