repeatEnd

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Given a string and an int N, return a string made of N repetitions of the last N characters of the string. You may assume that N is between 0 and the length of the string, inclusive.
repeatEnd("Hello", 3) → "llollollo"
repeatEnd("Hello", 2) → "lolo"
repeatEnd("Hello", 1) → "o"

public String repeatEnd(String str, int n)

{
    String res=str.substring(str.length()-n);
    for(int i=1;i<n;i++)
            res=res+str.substring(str.length()-n);
    return res;
}