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Finding all permutations of a string :

import java.util.Vector;
	
	public class StringPermutation {
		Vector obj;
		//String str, subString;
	
		public static void main(String[] args) {
			String str="abcd";
			StringPermutation obj=new StringPermutation();
			obj.permutation("",str);
			obj.print();
		}
		public StringPermutation() {
			obj = new Vector();
		}
		public void permutation(String prefix, String remaining) {
	
			if (remaining.length() == 0) {
				if (!obj.contains(prefix)) {
					obj.add(prefix);
					return;
				}
			}
			for (int i = 0; i < remaining.length(); i++) {
			String	newPrefix = prefix + remaining.charAt(i);
			String newRemaining = remaining.substring(0, i)+remaining.substring(i+1, remaining.length());
				permutation(newPrefix, newRemaining);
			}
		}
	
		public void print() {
			for (int i = 0; i < obj.size(); i++) {
				System.out.println(i + " " + obj.elementAt(i));
			}
		}
	
	}