Answer Posted / g.s.reddy

public class Example {
public static void main(String args[]) throws Exception {
String input = "HAT";
showPattern("", input);
}
public static void showPattern(String st, String chars) {
if (chars.length() <= 1)
System.out.println(st + chars);
else
for (int i = 0; i < chars.length(); i++) {

try {
String newString = chars.substring(0, i)
+ chars.substring(i + 1);
showPattern(st + chars.charAt(i),newString);
} catch (Exception e) {
e.printStackTrace();
}
}
}
}

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