java - Why isn't my code working beyond printing the math.random? -

-

this question has answer here:

i'm new programmer , trying teach myself java doing random projects. below "rock, paper, scissors" game , issue i'm facing after printing "a", program ends , not continue onto if else statements below. can given appreciated.

package com.company;  import java.util.scanner;  public class main {      public static void main(string[] args) {          system.out.println("hello & welcome rock, paper, scissors. what's name?");         scanner scan = new scanner(system.in);         string userchoice = scan.nextline();         system.out.println("hello, " + userchoice + ". let's start game!");         scanner scan = new scanner(system.in);         system.out.println("choose one: rock, paper, scissors");         string userfirstchoice = scan.nextline();         system.out.println("you chose " + userfirstchoice);          double = math.random();         system.out.println(a);            if (a >= 0.00 && a<= 0.3){             if ( userfirstchoice== "rock"){                 system.out.println("rock vs rock: tie");             }             else if (userfirstchoice == "paper"){                 system.out.println("rock vs paper: lose!");             }             else if (userfirstchoice == "scissors"){                 system.out.println("rock vs scissors: win!");             }          }         else if (a>=0.3 && a<=0.6){             if(userfirstchoice == "paper"){                 system.out.println("paper vs paper: tie!");             }             else if (userfirstchoice == "rock"){                 system.out.println("rock vs paper: lose!");             }             else if(userfirstchoice == "scissors"){                 system.out.println("scissors vs paper: win!");             }          }         else if (userfirstchoice == "scissors"){             system.out.println("scissors vs scissors: tie!");         }         else if (userfirstchoice == "paper"){             system.out.println("paper vs scissors: lose!");         }         else if (userfirstchoice == "rock") {              system.out.println("rock vs scissors: win!");         }      }   }

you can't use == compare strings in java. (== compares references, , operands == references different strings though string contents identical.)

use userfirstchoice.equals("scissors") etc. instead.

your use of relational operators on double types is correct.


Comments

Post a Comment

Popular posts from this blog

Sass watch command compiles .scss files before full sftp upload -

-
i use winscp download , edit .scss files , sass on linux (on server) compile them .css . after saving file, use: sass scss/style.scss css/style.css , replaces css file compiled sccs. the problem i want skip part return command line after editing scss file, sake of automation , saving time. but, if use watch command: sass --watch scss/style.scss:css/style.css synchronize 2 files, alerts nonexistent css errors pop up: change detected to: scss/style.scss error scss/style.scss (line 232: invalid css after "...ht: bold; line-": expected "{", "") note that when file uploads quicker usual (sometimes happens) watch command job, no errors. this because, when file upload takes time, sass compiles scss file (on server) before uploaded remote folder. thus, compiles part of file, resulting in css errors. is there way set timer watch command waits few seconds after detects changes , before compiling? any other way overcome is, of course, ...
Read more

filehandler - java open files not cleaned, even when the process is killed -

-
there java program read files folder, processing , write output files in folder. ran 4 hours , produced few files failed after throwing following error: "too many files" then modified program close (bufferreader , bufferwriter) , started process again. time process failed after starting throwing following error: java.io.filenotfoundexception: <file> (too many open files) then tried running lsof , searched process having no of open files. realized networkmanager. not sure whether should kill process or not. restarted machine. after when ran java program, still got same error. in worst case might possible code still having leaks in terms of not closing everything, still failing after starting process. have feeling lying in system previous run. if start same process in other machine, runs hours before failing. you cannot retain resource between runs of program, if wanted to. leave system without enough resources in theory, though unlikely, restarting...
Read more

gridview - Yii2 DataPorivider $totalSum for a column -

-
i have order , ordersearch models. in order list (actionindex) gridview there filtering , sorting. on of columns in order order_total (sum of products in order). i need implement sum of order_total in gridview. if manually counting activedataprovider->getmodels() array_map spend 3 seconds 3000 orders (localhost). don't want miss time. i see 2 ways make faster: create cache every filter , update lifetime (horrible) the interesting can right in ordersearch->search() method $query method. don't understand how can pass in controller. example of code 2nd way: class ordersearch extends order { public $totalsum; public function search($params) { $query = order::find(); $dataprovider = new activedataprovider([ 'query' => $query, ]); $this->load($params); $this->totalsum = $query->sum('order_total'); // works fast return $dataprovider; } } after i...
Read more