一个类中定义多个接口

代码来自zookeeper:

package org.apache.zookeeper;

public interface AsyncCallback {
interface StatCallback extends AsyncCallback {
public void processResult(int rc, String path, Object ctx, Stat stat);
}

interface DataCallback extends AsyncCallback {
public void processResult(int rc, String path, Object ctx, byte data[],
Stat stat);
}

interface ACLCallback extends AsyncCallback {
public void processResult(int rc, String path, Object ctx,
List<ACL> acl, Stat stat);
}

interface ChildrenCallback extends AsyncCallback {
public void processResult(int rc, String path, Object ctx,
List<String> children);
}

interface Children2Callback extends AsyncCallback {
public void processResult(int rc, String path, Object ctx,
List<String> children, Stat stat);
}

interface StringCallback extends AsyncCallback {
public void processResult(int rc, String path, Object ctx, String name);
}

interface VoidCallback extends AsyncCallback {
public void processResult(int rc, String path, Object ctx);
}
}


调用方式：
public class DataMonitor implements Watcher, StatCallback