Java Unicode converter

package com.test;

public class Test {

public static void main(String arg[]) {

//System.out.print("كل ما تحب معرفته عن");

System.out.print(convert("كل ما تحب معرفته عن"));;

}

public static String convert(String str)

{

StringBuffer ostr = new StringBuffer();

for (int i = 0; i < str.length(); i++)

{

char ch = str.charAt(i);

if ((ch >= 0x0020) && (ch <= 0x007e)) // Does the char need to be
// converted to unicode?

{

ostr.append(ch); // No.

} else // Yes.

{

ostr.append("\\u"); // standard unicode format.

String hex = Integer.toHexString(str.charAt(i) & 0xFFFF); // Get
// hex
// value
// of
// the
// char.

for (int j = 0; j < 4 - hex.length(); j++)
// Prepend zeros because unicode requires 4 digits

ostr.append("0");

ostr.append(hex.toLowerCase()); // standard unicode format.

// ostr.append(hex.toLowerCase(Locale.ENGLISH));

}

}

return (new String(ostr)); // Return the stringbuffer cast as a string.

}

}