// declare instance variables
private short accScore;

....
// whenever there is a change in the new score
// assume that the newScore is the variable you store the new score.
accScore += newScore;

// declare instance variable
// where key is the player's name and  value is the accumulated score.
private Map<String, Short > accScoresMap = new HashMap<String, Short>();

// whenever there is a change specific to a person
// assuming that playerName = the player's name
//                     currentScore = the score of the current play.
// 1. check if the map contains such a person
if (accScoresMap.contains(playerName))
{
    // 2. get the score and update the map
    Short score = accScoreMap.get(playerName);
    accScoreMap.put(playerName, score+=currentScore);
}
else
{
    // exception handing...
}

haitao517 wrote:
还有个问题想请教一下 JiaFan，能给我推荐本书吗？是关于Java语法结构的，能让我写出来的程序看上去是面向对象的，而不是像在学校里所学的那些结构化的写法。