public class C {
    public static void  align(String str,int k,String c){
        if(k-str.length() >0){
            for(int i=0;i<k-str.length();i++)
                str=str+c;
        }
        System.out.println("左对齐："+str);    
        System.out.println("右对齐："+new StringBuffer(str).reverse().toString());
    }
     
    public static void main(String[] args){
        //左对齐和右对齐，参数为一个字符串，和一个整数，还有一个字符。
        //当字符串长度小于整数时，用字符补全。
        align("abcdefg",20,"*");
    }
}

------解决方案--------------------
Java code

    public static void main(String[] args) {
        String str = "hello";

        System.out.println(left(str, 10, '+'));
        System.out.println(right(str, 10, '+'));
    }

    public static String left(String str, int len, char c) {
        StringBuffer sb = new StringBuffer(str);
        while (sb.length() < len) {
            sb.insert(0, c);
        }
        return sb.toString();
    }

    public static String right(String str, int len, char c) {
        StringBuffer sb = new StringBuffer(str);
        while (sb.length() < len) {
            sb.append(c);
        }
        return sb.toString();
    }