import?java.util.*;
public?class?Box2?{
public?static?void?main(String[]?args)?{??????
String?m;?????
String?w;?????
String?y;?????
System.out.println("功率大于50馬力嗎？?請(qǐng)輸入Y或N");??????
Scanner?sc=new?Scanner(System.in);???????
m=sc.nextLine();???????
System.out.println("維修記錄不全嗎？請(qǐng)輸入Y或N");??????
w=sc.nextLine();???????
System.out.println("運(yùn)行超過10年嗎？請(qǐng)輸入Y或N");?????
y=sc.nextLine();???????
instruct(m,?w,?y);???
}
public?static?void?instruct(String?m,String?w,String?y){?????
if(m.equals("Y")){?????????
if(w.equals("Y")){?????????????
if(y.equals("Y")){?????????????????
System.out.println("進(jìn)行優(yōu)先處理");
}??????????
}??????
}??????
else?if(m.equals("Y")){???????????
if(w.equals("Y")){?????????????
if(y.equals("N")){?????????????????
System.out.println("進(jìn)行優(yōu)先處理");??????????????????
}??????????????
}??????
}??????????
else?if(m.equals("Y")){???????????
if(w.equals("N")){?????????????
if(y.equals("Y")){?????????????????
System.out.println("進(jìn)行優(yōu)先處理");??????????????????
}??????????????
}???????}??????
else?if(m.equals("Y")){???????????
if(w.equals("N")){?????????????
if(y.equals("N")){?????????????????
System.out.println("做其他處理");???????????????????????
}??????????????
}??????
}??????
else?if(m.equals("N")){???????????
if(w.equals("Y")){?????????????
if(y.equals("Y")){?????????????????
System.out.println("進(jìn)行優(yōu)先處理");??????????????????
}??????????
}??????
}??????
else?if(m.equals("N")){???????????
if(w.equals("Y")){?????????????
if(y.equals("N")){?????????????????
System.out.println("作其他處理");???????????????
}??????????
}??????
}??????
else?if(m.equals("N")){???????????
if(w.equals("N")){?????????????
if(y.equals("Y")){?????????????????
System.out.println("進(jìn)行優(yōu)先處理");??????????????
}??????????
}??????
}??????
else?if(m.equals("N")){???????????
if(w.equals("N")){?????????????
if(y.equals("N")){?????????????????
System.out.println("作其他處理");???????????????
}??????????????????????????
}??????????
}else??????????
System.out.println("輸入錯(cuò)誤");????????
}??
}

如上圖所示，從第一個(gè)else if 語(yǔ)句開始就不能正常顯示輸入語(yǔ)句了。跪求大神解答