Java Tribonacci Series

public class TribonacciSeries{
       static String findSeries(int n) { 
            int a,b=1, c=0, d=0, i=1;

StringBuffer buffer=new StringBuffer();
while(i<=n) { 
    buffer.append(d);
    buffer.append("\n");
    a=b;
    b=c; 
    c=d;
    d=a+b+c;
    i++;
    }
    return buffer.toString();
     }
    public static void main( String[] args ){
    String series=findSeries(5);
    System.out.println(series);
    }
}

public class TribonacciSeries{ static String findSeries(int n) { int a,b=1, c=0, d=0, i=1;

StringBuffer buffer=new StringBuffer(); while(i<=n) { buffer.append(d); buffer.append("\n"); a=b; b=c; c=d; d=a+b+c; i++; } return buffer.toString(); } public static void main( String[] args ){ String series=findSeries(5); System.out.println(series); } }