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java Inputstraemreader problem

Hi ,
I am trying to exceute a command in java and try to read the output line by line.
Sting string1=new String("ls" , "-l" ,filenam);
Process p=Runtime.getRuntime().exc(str1,null,dir)
BufferReader line_ls=new BufferedReader(newInputStreamReader(p.getInputStream());
System.out.println(line_ls.ready());

The ouput is false

this means the input stream is blank.But since the program is not throwing io exception the command is exceuting.

I dont understand why the inputstream is blank.
Please advice

use the String[] argument constructor:

Code:

String[] s = new String[] { "ls", "-l", "/home/me"};



Process p = Runtime.getRuntime().exec(s);



InputStream in = p.getInputStream();



int n;



while((n = in.read()) != -1) {

  System.out.write(n);

}