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This article mainly shows you the "Java construction method super and custom exception throw collection how to use", the content is easy to understand, clear, hope to help you solve your doubts, the following let the editor lead you to study and learn "Java construction method super and custom exception throw collection how to use" this article.

1. Construction method:

Public class name () {} distinguish / / public void method name () {}

Divided into parametric and non-parametric subclass construction methods

Public class Zi extends fu {public int message=35;public Zi () {System.out.println (who am I);}}

When you create an object: output: the contents of the subclass constructor:

2.super and this use: public void show (int message) {System.out.println (this.message); / / returns the member variable System.out.println (super.message) of this class; / / returns the member variable of the parent class}

3. The constructor uses:

Public Zi (int name) {System.out.println (name);} public fu (int name) {System.out.println (name);} Zi sw=new Zi

The subclass needs to add a super (name)

By creating a subclass object: returning the subclass parametric constructor, and returning the parent parameterized constructor

If you do not add, you can only return the parametric constructor of the subclass, and the parameterless constructor of the parent class

So:

Public Zi (int name) {super (name); / / add this System.out.println (name);}

4. Custom exception throw: (supplementary)

Public class Student {public void sctrr (int score) throws uytig {if (score100) {throw new uytig (); / / throw exception object} else {System.out.println ("method exception!") ;}} public class uytig extends Exception {public uytig () {super ();} public uytig (String message) {super (); / / public Exception (String message) {/ / super (message); / /} / / public Throwable (String message) {/ / fillInStackTrace (); / / detailMessage = message / /}} public class fu {public static void main (String [] args) throws uytig {Student sc=new Student (); try {sc.sctrr (98);} catch (uytig uytig) {uytig.printStackTrace ();}

Enter score=120

Printing: wrong location

Uytig

At Student.sctrr (Student.java:10)

At fu.main (fu.java:11)

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