1,   ÄÚµå¿Í °á°ú¸¦ º¸°í ä¿ö¶ó

package ch06_12week;

class A {}

(                  1          )

public class q1 {

   public static void main(String[] args) {

D d = new D();

System.out.println(d instanceof A );}}

°á°ú

True

 

 

2. ÄÚµå¿Í °á°ú¸¦ º¸°í ä¿ö¶ó

package ch06_12week;

class Baap {

public int h = 4;

public int getH() {

System.out.println("Baap " + h);

return h;}}

 

public class q2_2 extends Baap {

public int h = 44;

public int getH() {

System.out.println("q2_2 " + h);

return h;}

public static void main(String[] args) {

Baap b = new q2_2();

(           2        );

System.out.println(bb.h);

System.out.println();

System.out.println(bb.getH());

}}

°á°ú

44

 

q2_2 44

 

 

3.4. fi ¸¦ ÀÌ¿ëÇÏ¿© ÄÚµå¿Í °á°ú¸¦ º¸°í ä¿ö¶ó

package ch06_12week;

class A4{

      final int fi = 10;

   }

   public class q3 extends A4{

      int fi = 15;

      public static void main(String[] args){

          q3 b = new q3();

          b.fi = 20;

          System.out.println(3    );

          System.out.println(   4 );

      }

   }

°á°ú

20

10

 

 

 

5. 6. ÄÚµù°ú °á°ú¸¦ º¸°í 5 ¹øÀº qs5 ¸¦ ÀÌ¿ëÇÏ°í 6 ¹øÀº Print ¸¦ ÀÌ¿ëÇ϶ó .

package ch06_12week;

class qs5 {

   String Print() {

             return "A";}}

class qs6 extends qs5{

   String Print() {

             return "B";}}

 

public class qr5{

   public static void main(String[] args) {

          (          5           );

             (          6           );}}

  

°á°ú

B

 

7. 8. ÄÚµù°ú °á°ú¸¦ º¸°í 7 ¹øÀº ch ¸¦ ÀÌ¿ëÇÏ°í 8 ¹øÀº Print ¸¦ ÀÌ¿ëÇ϶ó .

package ch06_12week;

class sp{

   void Print() {

             System.out.println(" ¼ö Ŭ·¡½º ");}}

class sc extends sp{

   void Print() {

             System.out.println(" È÷ Ŭ·¡½º ");}

   void Print(String str) {

             System.out.println(str);}}

  

public class q7 {

   public static void main(String[] args) {

             sp ch=new sc();

             (7)    ;

             (8);}}

            

°á°ú

È÷ Ŭ·¡½º

 

 

9.10. ÄÚµù°ú °á°ú¸¦ º¸°í 9 ¹øÀº Member ¸¦ ÀÌ¿ëÇÏ°í 10 ¹øÀº m1 ¸¦ ÀÌ¿ëÇ϶ó .

 

package ch06_12week;

public class Member {

public String name;

public long number;

Member(String name, long number){

this.name=name;

this.number=number;}

public String toString() {

package ch06_12week;

public class MemberT {

public static void main(String[] args){

(             9                      );

(              10                );}}

°á°ú

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