使用Set去除String中的重复字符

使用Set去除String中的重复字符

public class test14 {
    public static void main(String[] args) {
        String str = "ababc";
        System.out.println(removeChar(str));
    }
    
    public static String removeChar(String str){
        System.err.println(str + ",长度为：" + str.length());
        Set<Character> set = new HashSet<Character>();
        StringBuffer sb = new StringBuffer();
        for (int i = 0; i < str.length(); i++) {
            set.add(str.charAt(i));
        }
        for (Character c : set) {
            sb.append(c);
        }
    return sb.toString();
    }
}