I am trying to print all parent folders from the path specified using Java.
For instance,I got this path
/root/p0/p1/p2/p3/report Now my expected output is
/root/p0/p1/p2/p3 /root/p0/p1/p2 /root/p0/p1 /root/p0 /root How can we do this in Java? Any pre-defined functions exist in Java or by looping it? How to loop this path and get the expected parent url's?
You could try using getParent form Path, or gerParentFile from File. Your code can look like:
public static void printParents(File f){ while(f != null){ f = f.getParentFile(); if (f !=null && !f.getName().isEmpty()) System.out.println(f); } } public static void printParents(String f){ printParents(new File(f)); } You can also use String methods like split to get all parts from this path. Then you can join parts you want like
public static void printParents(String path){ String[] elements = path.split("(?<!^)/"); StringBuilder sb = new StringBuilder(elements[0]); for (int i=1; i<elements.length; i++){ System.out.println(sb); sb.append("/").append(elements[i]); } } 
Path and Paths are classes added in Java 7. They ware part of new API placed in java.nio.file package, which is meant to replace old File class. Are you perhaps using Java 6 or earlier?Have you tried the getParent function:
public static String getParentName(File file) { if(file == null || file.isDirectory()) { return null; } String parent = file.getParent(); parent = parent.substring(parent.lastIndexOf("\\") + 1, parent.length()); return parent; } 
/and off you go.