代码大全

/**项目中完成一个操作需要经过一些列的处理*/
public abstract class AbstractHandler {
    public static AbstractHandler startHandler = new Handler1();
    private AbstractHandler nextHandler;

    static {
        startHandler.setNextHandler(new Handler2())
                .setNextHandler(new Handler3());
    }

    private AbstractHandler setNextHandler(AbstractHandler handler){
        this.nextHandler = handler;
        return this.nextHandler;
    }

    protected void commonLog(){
        System.out.println(this.getClass().getName());
    }

    protected void handle(){
        if(this.nextHandler != null){
            this.nextHandler.handle();
        }
    }
}


public class Handler1 extends AbstractHandler {
    @Override
    protected void handle() {
        if(true){
            System.out.println("handle1");
            super.commonLog();
        }
        super.handle();
    }
}