private Set<Role> roles = new HashSet<Role>(0); 解释一下用法？
private Set<Role> roles = new HashSet<Role>(0); 解释一下用法？
[解决办法]
[解决办法]
忘写代码了
- Java code
Set<Role> roles = new HashSet<Role>(0); roles.add("a"); Iterator<Role> i = roles.iterator(); while (i.hasNext()) { Role r = i.next(); System.out.println(r); }