What is the difference between php construction method and java construction method

This article mainly introduces the relevant knowledge of "what is the difference between php construction method and java construction method". The editor shows you the operation process through an actual case. The operation method is simple, fast and practical. I hope this article "what is the difference between php construction method and java construction method" can help you solve the problem.

Differences: 1, when rewriting the subclass constructor, PHP does not call the parent class, while java defaults to call the parent constructor before the first statement; 2, Java allows multiple constructors, while the PHP value allows for a constructor; 3, constructors in Java are required, while those in PHP are not.

This article operating environment: Windows10 system, PHP7.1 version, Dell G3 computer.

What is the difference between php construction method and java construction method

In the early days, PHP did not have object-oriented functionality, but with the development of PHP, object-oriented was added starting with PHP4. The object-oriented syntax of PHP is evolved from JAVA, which is similar in many places, but develops its own characteristics. In terms of constructors, functions with the same name as classes in PHP4 are considered constructors (like JAVA), but this is no longer recommended in PHP5, and _ _ construct is recommended as the name of the constructor.

1. When overriding the subclass constructor, PHP does not call the parent class, and JAVA calls the parent constructor before the first statement by default

JAVA

Class Father {public Father () {System.out.println ("this is fahter");}} class Child extends Father {public Child () {System.out.println ("this is Child");}} public class Test {public static void main (String [] args) {Child c = new Child ();}}

Output result:

This is fahter

This is Child