Scope and use of super keyword in Java -


why can't access parent class variable super keyword?

with below code, output is:

feline cougar c c    
class feline {     public string type = "f ";      public feline() {         system.out.print("feline ");     } }  public class cougar extends feline {     public cougar() {         system.out.print("cougar ");      }      void go() {         type = "c ";         system.out.print(this.type + super.type);     }      public static void main(string[] args) {         new cougar().go();     } }

the answer original question simple: there 1 variable called type. initial value gets overwritten c. remember there 1 object, 1 variable. prashant's code creates second variable , 1 doesn't overwrite original string in parent class.


Comments

Post a Comment

Popular posts from this blog

angular - DownloadURL return null in below code -

when change file updated in firebase storage when try downloadurl show null. filechange(event: any) { const imagefolder: string = this.employee.id; const filelist: filelist = event.target.files; const file: file = filelist[0]; const storageref = firebase.storage().ref().child(`${imagefolder}/profile.jpg`).put(file); console.log(storageref.snapshot.downloadurl); } the put() asynchronous. if want url after file uploaded have this: firebase.storage().ref().child(`${imagefolder}/profile.jpg`).put(file).then((snapshot) => { storageref = snapshot.downloadurl: console.log(snapshot.downloadurl); });
Read more

meteor - inserting data to database gives error "insert failed: Method '/texts/insert' not found" -

i have other project broke somehow(i have no idea) , rebuilt app same file names , code , working fine. problem when go insert data database called texts error insert failed: method '/texts/insert' not found not know wrong because copied every line of code previous project , problem came wasn't there before. confuses me when create user accounts accounts.createuser() works fine. sendtext.js import react "react"; import {texts} "./../api/text"; import {withrouter} 'react-router-dom'; import {meteor} "meteor/meteor"; import {accounts} "meteor/accounts-base" class sendtext extends react.component{ send(e){ e.preventdefault(); let message = this.refs.message.value; let name = accounts.user().username if(name != ""){ if(message){ texts.insert({ name, message }); this.refs.m...
Read more