public class LeaveRequest {
    private String name;//姓名
    private int num;//請假天數
    private String content;//請假內容
    public LeaveRequest(String name, int num, String content) {
        this.name = name;
        this.num = num;
        this.content = content;
    }
    public String getName() {
        return name;
    }
    public int getNum() {
        return num;
    }
    public String getContent() {
        return content;
    }
}

public abstract class Handler {
    protected final static int NUM_ONE = 1;
    protected final static int NUM_THREE = 3;
    protected final static int NUM_SEVEN = 7;
    //該領導處理的請假天數區(qū)間
    private int numStart;
    private int numEnd;
    //領導上面還有領導
    private Handler nextHandler;
    //設置請假天數范圍 上不封頂
    public Handler(int numStart) {
        this.numStart = numStart;
    }
    //設置請假天數范圍
    public Handler(int numStart, int numEnd) {
        this.numStart = numStart;
        this.numEnd = numEnd;
    }
    //設置上級領導
    public void setNextHandler(Handler nextHandler){
        this.nextHandler = nextHandler;
    }
    //提交請假條
    public final void submit(LeaveRequest leave){
        if(0 == this.numStart){
            return;
        }
        //如果請假天數達到該領導者的處理要求
        if(leave.getNum() >= this.numStart){
            this.handleLeave(leave);
            //如果還有上級 并且請假天數超過了當前領導的處理范圍
            if(null != this.nextHandler && leave.getNum() > numEnd){
                this.nextHandler.submit(leave);//繼續(xù)提交
            } else {
                System.out.println("流程結束");
            }
        }
    }
    //各級領導處理請假條方法
    protected abstract void handleLeave(LeaveRequest leave);
}

public class Counselor extends Handler {
    public Counselor() {
        //輔導員 處理1-3天的請假
        super(Handler.NUM_ONE, Handler.NUM_THREE);
    }
    @Override
    protected void handleLeave(LeaveRequest leave) {
        System.out.println(leave.getName() + "請假" + leave.getNum() + "天," + leave.getContent() + "。");
        System.out.println("輔導員審批：同意。");
        //也可以在這里設置下一個鏈路處理的handler
        //setNextHandler(new Dean());
    }
}
public class Dean extends Handler {
    public Dean() {
        //院長處理3-7天的請假
        super(Handler.NUM_THREE, Handler.NUM_SEVEN);
    }
    @Override
    protected void handleLeave(LeaveRequest leave) {
        System.out.println(leave.getName() + "請假" + leave.getNum() + "天," + leave.getContent() + "。");
        System.out.println("院長審批：同意。");
        //也可以在這里設置下一個鏈路處理的handler
        //setNextHandler(new CollegeSecretary ());
    }
}
public class CollegeSecretary extends Handler {
    public CollegeSecretary() {
        //學院書記處理7天以上的請假
        super(Handler.NUM_SEVEN);
    }
    @Override
    protected void handleLeave(LeaveRequest leave) {
        System.out.println(leave.getName() + "請假" + leave.getNum() + "天," + leave.getContent() + "。");
        System.out.println("學院書記審批：同意。");
        //也可以在這里設置下一個鏈路處理的handler
        //setNextHandler(null); //最后一個
    }
}

public class TestClient {
    public static void main(String[] args) {
        //請假條來一張
        LeaveRequest leave = new LeaveRequest("kaico",8,"身體不適");
        //各級領導
        Counselor counselor= new Counselor();
        //如果前面handleLeave 方法中設置了下一個handler，這里就不需要了，直接提交申請就好了
        Dean dean = new Dean();
        CollegeSecretary collegeSecretary = new CollegeSecretary();
        counselor.setNextHandler(dean);//輔導員的領導是院長
        dean.setNextHandler(collegeSecretary);//院長的領導是學院書記
        //提交申請
        counselor.submit(leave);
    }
}