常用的声明方式(使用静态代码块):
public final static Map map = new HashMap();
static {
map.put("key1", "value1");
map.put("key2", "value2");
}
@SuppressWarnings("serial")
private static Map<String, String> joinMap = new HashMap<String, String>(){{
put("join", "JOIN");
put("innerjoin", "INNER JOIN");
put("leftjoin", "LEFT JOIN");
put("rightjoin", "RIGHT JOIN");
put("fulljoin", "FULL JOIN");
}};
一种简约的方式:
public final static Map map = new HashMap() {{
put("key1", "value1");
put("key2", "value2");
}};
这种方式,相当于重载HashMap的一个匿名实现。向原有的HashMap中添加了一个匿名构造方法。
另外附加一个List/Set变量的声明方式:
public final static List list = Arrays.asList("elment1", "element2");