اینبار یک دستگرمی با چاشنی وراثت داریم! این دستگرمی رو جناب آقای ابوالفضل صادقی تهیه کردند.
با توجه به اینکه متد printf مانند printf در سی عمل می‌کند و به جای s% رشته و به جای d% مقدار int را جایگزین می‌کند، خروجی کد زیر را از بین گزینه‌های زیر انتخاب کنید.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 | public class Main { public static void main(String[] args) { new Child(); System.out.println("STATIC FIELD AGE IS " + Child.age); } } class Parent { public static int age = 48; public final String name = "ahmed"; public String family = "ahmedi"; private String phone = "+981212121212"; public Parent() { System.out.println("=======running on========>" + this.getClass()); System.out.printf("constructor$name:%s\n", name); logName(); System.out.printf("constructor$family:%s\n", family); logFamily(); System.out.printf("constructor$age:%d\n", age); logAge(); System.out.printf("constructor$phone:%s\n", phone); logPhone(); } public void logName() { System.out.printf("name is %s\n",this.name); } public void logFamily() { System.out.printf("family is %s\n", this.family); } public void logAge() { System.out.printf("age is %d\n", this.age); } private void logPhone() { System.out.printf("phone is %s\n", this.phone); } } class Child extends Parent { public String name = "jafari"; public Child() { System.out.println("=======parent is=========>" + super.getClass()); System.out.println("=======running on========>" + this.getClass()); System.out.printf("constructor$name:%s\n", name); logName(); System.out.printf("constructor$family:%s\n", family); logFamily(); System.out.printf("constructor$age:%d\n", age); logAge(); } @Override public void logFamily() { System.out.println("family is akbarAbadi"); } } |
گزینه‌ها
گزینه ۱
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 | =======running on========>class Child constructor$name:ahmed name is ahmed constructor$family:ahmedi family is akbarAbadi constructor$age:48 age is 48 constructor$phone:+981212121212 phone is +981212121212 =======parent is=========>class Child =======running on========>class Child constructor$name:jafari name is ahmed constructor$family:ahmedi family is akbarAbadi constructor$age:48 age is 48 STATIC FIELD AGE IS 48 |
گزینه ۲
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 | =======running on========>class Parent constructor$name:ahmed name is ahmed constructor$family:ahmedi family is ahmedi constructor$age:48 age is 48 constructor$phone:+981212121212 phone is +981212121212 =======parent is=========>class Parent =======running on========>class Child constructor$name:jafari name is jafari constructor$family:ahmedi family is akbarAbadi constructor$age:48 age is 48 STATIC FIELD AGE IS 48 |
گزینه ۳
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 | =======running on========>class Child constructor$name:jafari name is jafari constructor$family:ahmedi family is ahmedi constructor$age:48 age is 48 constructor$phone:+981212121212 phone is +981212121212 =======parent is=========>class Parent =======running on========>class Child constructor$name:jafari name is jafari constructor$family:ahmedi family is akbarAbadi constructor$age:48 age is 48 STATIC FIELD AGE IS 0 |
گزینه ۴
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 | =======running on========>class Parent constructor$name:jafari name is jafari constructor$family:ahmedi family is ahmedi constructor$age:48 age is 48 constructor$phone:+981212121212 phone is +981212121212 =======parent is=========>class Parent =======running on========>class Child constructor$name:jafari name is jafari constructor$family:ahmedi family is akbarAbadi constructor$age:48 age is 48 STATIC FIELD AGE IS 0 |
طراح عزیز: جناب آقای ابوالفضل صادقی
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با ما همراه باشید
آدرس کانال تلگرام: JavaCupIR@
آدرس اکانت توییتر: JavaCupIR@
آدرس صفحه اینستاگرام: javacup.ir
صفحه ویرگول: javcup
آدرس گروه لینکدین: Iranian Java Developers
