java - Error handling, throw exceptions, and user inputs -


i'm trying to user inputs(eg. file names) , store them arguments in function. however, both println's displayed simultaneously. blocks me entering arguments properly. think has throwing exceptions. cannot run program if don't add exceptions.

public class demon {     static scanner input = new scanner(system.in);  public static void main(string [] args) throws exception {     mainmenu(); }//end main  public static void mainmenu() throws exception {     system.out.println("welcome demon. please select option below:");     system.out.println("1: encrypt file");     system.out.println("2: decrypt file");     system.out.println("3: exit");     int useroption = input.nextint();     if (useroption == 1) {         optionencrypt();     } else if (useroption == 2) {         optiondecrypt();     } else if (useroption == 3) {         system.exit(0);     }else {         system.out.println("invalid entry");         system.exit(0);     } }  public static void optionencrypt() throws exception {     system.out.println("enter file name encrypt:");     string inputfilename = input.nextline();     system.out.println("enter file name output:");     string outputfilename = input.nextline();     createencryptionfile("test.txt", "demon.txt"); }  output: 1: encrypt file 2: decrypt file 3: exit 1 enter file name encrypt: enter file name output:

just change nextline() method next().

seems when first integer via nextint() method, there still new line taken nextline() function


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