StringTokenizer

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package com.shawon.strings;

import java.util.StringTokenizer;

/**
 *
 * @author shawonmajid
 */
public class StringTest {
    public static void main(String[] args) {
        String str = "12 315 1251 232 2525 end";

        StringTokenizer tok = new StringTokenizer(str);

        int ans = 0;
        while(tok.hasMoreTokens()){
            String cur = tok.nextToken();
            if(!cur.equals("end")){
                ans += Integer.parseInt(cur);
            }
        }

        System.out.println(ans);

    }
}