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

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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.


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