字符串操作---去重

package NiuKeNet;

import java.util.LinkedHashSet;
import java.util.Set;

public class Removesamestring {
	public static void main(String[] args) {
		System.out.println(removerepeatedchar("ddddccffgd"));
	}

	public static String removerepeatedchar(String s) {
		if (s == null)
			return s;
		StringBuffer sb = new StringBuffer();
		int i = 0, len = s.length();
		while (i < len) {
			char c = s.charAt(i);
			sb.append(c);
			i++;
			while (i < len && s.charAt(i) == c) {
				i++;
			}
		}
		return sb.toString();
	}

	private static String removesamestring(String str) {
		Set<String> mlinkedset = new LinkedHashSet<String>();
		String[] strarray = str.split(" ");
		StringBuffer sb = new StringBuffer();
		for (int i = 0; i < strarray.length; i++) {
			if (!mlinkedset.contains(strarray[i])) {
				mlinkedset.add(strarray[i]);
				sb.append(strarray[i] + " ");
			}
		}
		System.out.println(mlinkedset);
		return sb.toString().substring(0, sb.toString().length() - 1);
	}
}