设计模式 - 责任链模式

package desginPattern;
import java.util.ArrayList;import java.util.List;
interface IHandler {    boolean doHandle();}
/** * 责任链模式 */public class ChainOfResponsibility {
    public static void main(String[] args) {        new HandleChain()                .addHandle(new HandleA())                .addHandle(new HandleB())                .addHandle(new HandleC())                .handle();    }}
class HandleChain {    private List<IHandler> handles = new ArrayList<>();
    public HandleChain addHandle(IHandler handle) {        handles.add(handle);        return this;    }
    public void handle() {        for (IHandler handle : handles) {            boolean handled = handle.doHandle();            if (handled) {                break;            }        }    }}
class HandleA implements IHandler {    @Override    public boolean doHandle() {        boolean handled = false;        System.out.println("执行 HandleA 。");        return handled;    }}
class HandleB implements IHandler {    @Override    public boolean doHandle() {        boolean handled = true;        System.out.println("执行 HandleB 。");        return handled;    }}
class HandleC implements IHandler {    @Override    public boolean doHandle() {        boolean handled = true;        System.out.println("执行 HandleC 。");        return handled;    }}