C:\source>javac Jv_5_3.java
Jv_5_3.java:16: error: cannot find symbol
ken_sung.hakbun = "2060001";
        ^
  symbol:   variable hakbun
  location: variable ken_sung of type Sungjuk_5_3
Jv_5_3.java:20: error: cannot find symbol
wife_sung.hakbun = "20050002";
         ^
  symbol:   variable hakbun
  location: variable wife_sung of type Sungjuk_5_3
Jv_5_3.java:23: error: cannot find symbol
Sungjuk_5_3 yoo_sung = new sungjuk_5_3 ();
                           ^
  symbol:   class sungjuk_5_3
  location: class Jv_5_3
Jv_5_3.java:24: error: cannot find symbol
yoo_sung.hakbun = "20060003";
        ^
  symbol:   variable hakbun
  location: variable yoo_sung of type Sungjuk_5_3
Jv_5_3.java:28: error: cannot find symbol
soo_sung.hakbun = "2060004";
        ^
  symbol:   variable hakbun
  location: variable soo_sung of type Sungjuk_5_3
Jv_5_3.java:33: error: cannot find symbol
System.out.println(ken_sung.hakbun + " " + ken_sung.name + " "
                           ^
  symbol:   variable hakbun
  location: variable ken_sung of type Sungjuk_5_3
Jv_5_3.java:35: error: cannot find symbol
System.out.println(wife_sung.hakbun + " " + wife_sung.name + " "
                            ^
  symbol:   variable hakbun
  location: variable wife_sung of type Sungjuk_5_3
Jv_5_3.java:37: error: cannot find symbol
System.out.println(yoo_sung.hakbun + " " + yoo_sung.name + " "
                           ^
  symbol:   variable hakbun
  location: variable yoo_sung of type Sungjuk_5_3
Jv_5_3.java:39: error: cannot find symbol
System.out.println(soo_sung.hakbun + " " + soo_sung.name + " "
                           ^
  symbol:   variable hakbun
  location: variable soo_sung of type Sungjuk_5_3
9 errors