Iterable接口提供此功能：
public class ProjectSet implements Iterable<Project> {
private ArrayList<Project> projects;
public ProjectSet() {
this.projects = new ArrayList<Project>();
}
// .. iteration methods ??
@Override
public Iterator<Project> iterator() {
return projects.iterator();
}
}
您可以根据需要交换迭代器逻辑。
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