gistfile1.java

import java.util.*;

public class PermutationChar {

    public static void main( String[] args ) {
		String[] strArray = { "Guo Haoxuan", "Haoxuan Guo" };
		System.out.println( isPermutation ( strArray[0], strArray[1] ) );
	}	


	public static boolean isPermutation( String str1, String str2 ) {
		int[] set = new int[256];
		for ( int i = 0; i < 256; i++ )
			set[i] = 0;
		for ( int j = 0, len = str1.length(); j < len; j++ ) {
			int val = str1.charAt( j );
			set[val]++;
		}

		for ( int k = 0, len = str2.length(); k < len; k++ ) {
			int val = str2.charAt( k );
			if ( set[val] == 0 )
				return false;
			else set[val]--;
		}

		for ( int l = 0; l < 256; l++ ) {
			if ( set[l] !=0 )
				return false;
		}

		return true;
	}
}