Java????????????????ù??
???????????? ???????[ 2013/1/16 9:55:22 ] ????????
????????????Щ??????????t?????
????1??????????????ж??幹????????????????????????????????ι???????
public ClassName {}
????2??this ?? super ??????
????3???????????????Object??????Object????????ι???????
????4??????????????????????????????????????????ι????????????super()??
??????????????????
class Employee extends Object {
public Employee(int id) {
}
}
class Teacher extends Employee {
public Teacher() {
}
}
??????????????????????
Implicit super constructor Employee() is undefined. Must explicitly invoke another constructor
?????????????????????????????????????????????????????ι?????????????????????????????????????????????????????????????????????super()?????? ????????в??????????ι???????????????????ι?????δ???????
????????????
class Employee {
public Employee(int id) {
}
}
class Teacher extends Employee {
public Teacher() {
super(10);
}
}
???????????????????????????????????????????????????????????????????super()??????
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????????????public??protected??default??private???Σ????????private?????????????????????????
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