关于map

先看点代码

public class MaybeNumber {private Map maybeNumber;public static void main(String[] args) {MaybeNumber maybe = new MaybeNumber();Set set = maybe.getMaybeNumber("2013", "04").entrySet();Iterator iter = set.iterator();while (iter.hasNext()) {Map.Entry mapEntey = (Map.Entry) iter.next();System.out.println(mapEntey.getKey() + "鐨勫墠鏈熻摑鍙峰嚭鐜扮殑鍊间负锛?"+ mapEntey.getValue());}}public MaybeNumber() {maybeNumber = new HashMap();}public Map getMaybeNumber(String year, String number) {String str = "";DBUtils jdbc = null;ResultSet rs = null;String sql = null;try {jdbc = new DBUtils();sql = "select blue from ssq t where t.KJYEAR=" + year + "and "+ "((select blue from ssq m where m.KJNO=t.KJNO+1)=" + number+ ")";rs = jdbc.executeQuery(sql);// 鏌ヨ缁撴灉while (rs.next()) {str += rs.getString(1) + ", ";}this.maybeNumber.put(number + "", str);} catch (Exception e) {// TODO Auto-generated catch blocke.printStackTrace();}return maybeNumber;}}

上面的代码是从一个数据库中选择一些数据， 重点在与对map的使用。