Write Super statement in JavaSE8 Base subclass constructor to explicitly specify the constructor of the parent class

Os:windows7 x64
Jdk:jdk-8u131-windows-x64
Ide:eclipse Oxygen Release (4.7.0)


Code:

/** by default, the constructor of a subclass calls the parameterless constructor of the parent class first, but the problem is, what if the parent class does not have a parameterless constructor? * The constructor of the parent class is explicitly specified by Super *///the parent class Father {//Parameter constructor, intpublic Father (int num) {System.out.println ("parent class has a parameter constructor, int");} A parameter constructor, Stringpublic Father (String str) {SYSTEM.OUT.PRINTLN ("parent class has a parameter constructor, string");}} Class Son extends Father {//Subclass no parameter constructor public son () {super (1); System.out.println ("sub-class parameterless constructor");} Subclass has a parameter constructor public Son (int num) {super ("Hello"); System.out.println ("Sub-class has a parameter constructor");}} Class Demo {public static void main (string[] args) {son S1 = new Son (); System.out.println (); Son s2 = new Son (1); }}

Results:

Java is good, worth learning.
Learning resources: Itcast Video Library. If you have public resources, can share to me, with your resources to learn also can.
Blog post is to watch the video, into thinking written. It's good that the teacher speaks well. Blog bad, is to give the most bitter not serious.
If you think the blog can be improved, leave a message.

Write Super statement in JavaSE8 Base subclass constructor to explicitly specify the constructor of the parent class