三元運(yùn)算符

三元運(yùn)算符多級(jí)使用,條件運(yùn)算符是右結(jié)合的，也就是說(shuō)酪刀，從右向左分組計(jì)算郑象。

       例如:
         `a?b:c?d:e;`等價(jià)于`a?b:(c?d:e);`

問題：大于90成績(jī)?yōu)锳属百，60～89成績(jī)?yōu)锽，60以下為C

import java.util.Scanner;
public class Compare {
        public static void main(String []args){
            System.out.println("請(qǐng)輸入這個(gè)同學(xué)的成績(jī)");
            Scanner grade=new Scanner(System.in);
            int score=grade.nextInt();
            String number=score>100||score<0?"錯(cuò)誤":
                          score>=90? ("這個(gè)同學(xué)的等級(jí)為A"):
                         (score>60&&score<90?"這個(gè)同學(xué)的等級(jí)為B":
                                 "這個(gè)同學(xué)的等級(jí)為C");
                 System.out.println(number);
 }
}

三種判斷對(duì)比

三元運(yùn)算符

class TestSanyuan{
   public static void main (String[] args){
//三元運(yùn)算符號(hào)
       int gender = 1;
       char gText = gender == 1?'男':'女';
       System.out.println("三元運(yùn)算符號(hào)結(jié)果："+gText);
   }
}

if語(yǔ)句

class Testif{
   public static void main (String[] args){
                   int gender = 1;
                   char genderText = '  ';
                   if(gender == 1){
                             genderText = '男';
                    }else{
                             genderText = '女';
                    }
                  System.out.println(genderText);
       }
}

switch語(yǔ)句

class Testif{
    public static void main (String[] args){
                   int gender = 1;
                   char genderText = '  ';
                   switch(gender){
                          case 1:
                                genderText = '男';
                                break;
                          case 2:
                                genderText = '女';
                                break;
                          default:
                                genderText = '人妖';
                                break;
                    }
                    System.out.println(genderText);
        }
}