@Override
public Project getProject(int project_id) {
Project project = null;
if (projects.containsKey(project_id))
project = projects.get(project_id);
return project;
}
简化：
@Override public Project getProject(int project_id) { return projects.get(project_id); }
看看，有问题吗
原文：http://www.cnblogs.com/m5w10/p/4757594.html