ืื ืื ืฉืจืฉืจืช ืงืื ืกืืจืืงืืืจ?
ืื ืื ื-Java ืืื ืฉืืื ืกืคืฆืืคืืช ืืืฉืืฉืช ืืืฆืืจืช ืืืืืืงื ืฉื ืืืืงื. ืืื ืื ืืืคืขื ืืื ืคืขื ืฉืืืืืืงื ืฉื ืืืืืงื ื ืืฆืจ. ื ืืชื ืืืฉืชืืฉ ืื ืืื ืืืงืฆืืช ืขืจืืื ืืืืคืืื ื ืืืืืืืงื ืืืื ืืืฆืืจื. ืืืืืื ืืืืืช ืื ืืื ืืจืืืื ืืืืืงืช Java ืขื ืจืฉืืืืช ืคืจืืืจืื ืฉืื ืืช. ืฉืจืฉืืจ ืื ืืื ืืฉืืฉ ืืื ืืืคืขืื ืืืฉืืืื ืฉืื ืื ืฉื ืื ืืื ืฉื ืืืชื ืืืืงื/ืืืืงื ืื ืืืื ืืฆืืจืช ืืืืืืืงื.
ืืืฆื ืืืืฉืืช ืฉืจืฉืืจ ืื ืืื ื-Java?
ืืฉื ื ืฉืชื ืืจืืื ืืฉืจืฉืืจ ืื ืืื ืขื ืกืื ืืื ืืงืจืื ืืื ืื. ืื ืืืืงืื.
- ืืืืฆืขืืช ืืืืช ืืืคืชื ()ืื - ืืื ืืงืจืื ืืื ืืื ืืืืชื ืืืืงื
- ืฉืืืืฉ ืืืืืช ืืคืชื super() - ืืื ืืงืจืื ืืื ืืื ืฉื ืืืืงืช ืืื
ืื ืืืกืืจ ืืืืืืืืช ืืืืืช.
ืืืืื ืืฉืจืฉืืจ ืงืื ืกืืจืืงืืืจ ืืก' 1 - ืื ืืื ืืฉืืจืฉืจืื ืืืืฆืขืืช ืืืืช ืืคืชื ืื().
ืืืจืื ื ืขื ืืจืืขื ืื ืืื ืขืืืจ DerivedClass. ืืื ืืื ืืืขืื ืื ืืืฉืืืฉื ืืืืจืื ืขื ืืืขืื ืื ืฉืื ืื. ืืชืื ืื ืื ืื, ืืืืช ืืืคืชื
ืืื() ืืฉืืฉืช ืืื ืืงืจืื ืืื ืื ืืื ืืืืชื ืืืืงื.
package com.tutorialwriting.constchaining;
public class DerivedClass{
String firstName;
String country;
int age;
public DerivedClass() {
this("Maggie");
}
public DerivedClass(String firstName) {
this(firstName, 15);
}
public DerivedClass(String firstName, int age) {
this(firstName, age, "Australia");
}
public DerivedClass(String firstName, int age, String country) {
this.firstName = firstName;
this.age = age;
this.country = country;
}
void displayValues() {
System.out.println("First Name : " + firstName);
System.out.println("Country : " + country);
System.out.println("Age : " + age);
}
public static void main(String args[]) {
DerivedClass object = new DerivedClass();
object.displayValues();
}
}
ืืคืื ืฉื ืืืืฆืืข
ืืืืื ืืฉืจืฉืืจ ืื ืืื ืืก' 2 - ืื ืืื ืืฉืืจืฉืจืื ืืืืฆืขืืช ืืืืช ืืืคืชื super()
ืืื, ืืืชืช ืืืื ืงืืจืืช ืืื ืืื ืฉื ืืืืงืช ืืื ืืืืฆืขืืช ืืืืช ืืืคืชื
super() . ื-BaseClass ืืฉ ืฉืืืฉื ืื ืืื. ืืื ืื ืืื ืืจืืืื ืืื ืงืืจื ืืืื ืืื ืื ืฉืืืฉืช ืืืจืืืื ืืื ืฉื BaseClass ืืืืฆืขืืช
this() .
package com.tutorialwriting.constchaining;
public class BaseClass {
public BaseClass() {
this("Male", "English", "1989/11/10");
System.out.println("I'm executed third!!!");
}
public BaseClass(String firstName, String surname, int idNo) {
System.out.println("I'm executed first!");
System.out.println("First name : " + firstName);
System.out.println("Surname : " + surname);
System.out.println("ID Number : " + idNo);
}
public BaseClass(String gender, String nationality, String birthDate) {
System.out.println("I'm executed second!!");
System.out.println("Gender : " + gender);
System.out.println("Nationality : " + nationality);
System.out.println("Birth Date : " + birthDate);
}
}
ื-DerivedClass ืืฉ ืฉื ื ืื ืืื, ืื ืืื ืงืืจื ืืื ืืื ืืฉืื ืื ืฉื ืืืืงืช ืืขื ืืืืฆืขืืช
super() .
package com.tutorialwriting.constchaining;
public class DerivedClass extends BaseClass {
public DerivedClass() {
super();
}
public DerivedClass(String firstName, String surname, int idNo) {
super(firstName, surname, idNo);
}
public static void main(String args[]) {
DerivedClass object2 = new DerivedClass("Paul", "Wilson", 123456);
DerivedClass object1 = new DerivedClass();
}
}
ืืคืื ืฉื ืืืืฆืืข
ืงืจืืืช ืื ืื ืืจืืื ืืขืืืช ืืคืืจืฉ
ืื'ืืืื ืืฉ ืฉืชื ืืจืืื ืฉืื ืืช ืืงืจืื ืืื ืืื: ืงืจืืื ืืจืืืืช ืืงืจืืื ืืคืืจืฉืช.
- ืงืจืืื ืืคืืจืฉืช ืืชืืืืกืช ืืงืจืืื ืืื ืืื ืืืืคื ืืคืืจืฉ ืืงืื ืืืืฆืขืืช this() ืื super() .
- ืงืจืืื ืืจืืืืช ืืชืืืืกืช ืืงืจืืื ืฉื ืืื ืื ืืื ืืืืื ืฉื ืืืืงืช ืืขื ืืืืคื ืืจืืื ืืืืขืืจ ืงืจืืื ืืคืืจืฉืช ืืื ืืื ืื ืืืืงืืช ืืืื. ืืืืืื ืืืจืืช, ืืืืืจ ืืืกืืฃ ืืช ืืงืจืืื super() ืืฉืืจื ืืจืืฉืื ื ืฉื ืื ืืื ืืืื ืืื ืฉื ืืืืงืืช ืืืื ืื ืืืชืื ืช ืื ืงืืจื ืืืคืืจืฉ super() ืืงืื.
ืืื ืื ืื ื ืฆืจืืืื ืฉืจืฉืืจ ืงืื ืกืืจืืงืืืจ?
ืืฉื ื ืืกืคืจ ืืืจืืช ืฉืื ืืช ืืืฆืืจืช ืฉืจืฉืจืช ืื ืืื ื-Java, ืืืคืืจื ืืืื.
- ืืืื ืืจื ืืืฉืช ืืืืคืืื ืื ืฉื ืื ืืื ืืืจืื ืื ืืืืคืืื ืื ืฉื ืืืืงืืช ืื.
- ืืืื ืงืจืืื ืืื ืืื ืืืจืื, ื ืขืฉื ืฉืืืืฉ ืจืง ืืืืืืืงื ืืื, ืฉืืื ืืืืคืข ืื ืืืื ืฉื ืืืืืงื. ืืืชืืื ืืชืจืืฉ ืืืงืื ืืื, ืืื ืืฉ ืื ื ืืช ืืคืจืืืืืืื ืืงืจืื ืืืืืืฉื ืื ืืื ืฉืื ืื ืืจื ืฉืจืฉืจืช. ืื ืขืืืจ ืืืื ืื ืืืื ืืืืจืื ืืชืืืืงืช ืงืื.
ืกืืืื
ืืืืจืื ืื, ืื ื ืืฉืจืฉืืจ ืื ืืื ื-Java. ืงืื ืกืืจืืงืืืจืื ืื ืืงืืขื ืงืื ืืืืื ืฉืืื ืืืืคืขืืื ืืืื ืืฆืืจืช ืืืืืืงืืื. ืืืืืงื ืฉื Java ืืืืื ืืืืืช ืื ืืกืคืจ ืฉื ืื ืืื ืขื ืจืฉืืืืช ืคืจืืืจืื ืฉืื ืืช. ืฉืจืฉืจืช ืงืื ืกืืจืืงืืืจ ืืื ืืจื ืฉืืืืฉืืช ืืืืคืื ืืืชืืืืื ืฉืื ืื ืขื ืืืคืข ืืื ืฉื ืืืืงื. ืืื ื ืงืืืืช ืืฉืืืืช ืฉืืฉ ืืฉืื ืื ืืืืืจืื ืืื ืืคืืจืืืช ืืืื.
- ืื ืืืชืื ืช ืื ืืืกืืฃ ืืช ืื ืืืคืืจืฉ ืืงืื, ืืืืืจ ืืืกืืฃ ืื ืื ืฆืืืืจื ืืื ืืืืื ืืืืืงื ืฉื Java. ืื ื ืงืจื ืื ืื ืืจืืจืช ืืืืื.
- this() ื- super() ืฆืจืืืื ืืืืืชื ืืฉืืจื ืืจืืฉืื ื ืฉื ืืื ืื.
- this() ืืฉืืฉ ืืงืจืืื ืืื ืืื ืืืืชื ืืืืงื ืืืืื super() ืืฉืืฉ ืืงืจืืื ืืื ืืื ืฉื ืืืืงืช ืืขื ืืืืืืืช.
- ืฆืจืื ืืืืืช ืื ืื ืืื ืืคืืืช ืืชืื ืืืืืงื ืฉืื ืืืื ืืช ืืืืช ืืืคืชื () ืืื .
- ืื ืื ืืชืืืกืฃ ืืืคืืจืฉ, ืืืืืจ ืืืกืืฃ ืงืจืืืช super() ืืื ืืืืื ืืื ืื ืื ืืืืงืืช ืืื. ืื ืืขืืืจ ืืืฆืืจืช ืฉืืขืืจืื ืืฆืืจื ื ืืื ื.
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