java.util.scanner - Why am I getting the error, "java.util.NoSuchElementException"? -
this question has answer here:
- scanner nosuchelementexception 2 answers
my error message looks this:
exception in thread "main" java.util.nosuchelementexception: no line found @ java.util.scanner.nextline(scanner.java:1540) @ gpa3.answer(gpa3.java:364) @ gpa3.main(gpa3.java:355) i have main method , rest of code working once add piece of code throws error. not allow me enter scanner.
import java.util.scanner; public class gpa3 { public static void main(string[] args) { system.out.println("hello! welcome gpa calculator."); int math; double mathgpa = 0; system.out.println("math = "); scanner input = new scanner(system.in); math= input.nextint(); if (math >100){ system.out.println("you have mistyped something"); } if (math >= 94){ system.out.println("you have a"); mathgpa = 4.0; system.out.println(mathgpa); } if (math < 94 && math >=90){ system.out.println("you have a-"); mathgpa = 3.7; system.out.println(mathgpa); } if (math < 90 && math >=87){ system.out.println("you have b+"); mathgpa = 3.3; system.out.println(mathgpa); } if (math < 87 && math >=80){ system.out.println("you have b"); mathgpa = 3.0; system.out.println(mathgpa); } if (math < 80 && math >=77){ system.out.println("you have b-"); mathgpa = 2.7; system.out.println(mathgpa); } if (math < 77 && math >=73){ system.out.println("you have c+"); mathgpa = 2.3; system.out.println(mathgpa); } if (math < 73 && math >=70){ system.out.println("you have c"); mathgpa = 2.0; system.out.println(mathgpa); } if (math < 70 && math >=67){ system.out.println("you have c-"); mathgpa = 1.7; system.out.println(mathgpa); } if (math < 67 && math >=67){ system.out.println("you have d+"); mathgpa = 1.3; system.out.println(mathgpa); } if (math < 67 && math >=63){ system.out.println("you have d"); mathgpa = 1.0; system.out.println(mathgpa); } if (math < 63 && math >=60){ system.out.println("you have d-"); mathgpa = 0.7; system.out.println(mathgpa); } if (math < 60){ system.out.println("you have f"); mathgpa = 0.0; system.out.println(mathgpa); }//end of math int english; double englishgpa = 0; system.out.println("english = "); english= input.nextint(); if (english >100){ system.out.println("you have mistyped something"); } if (english >= 94 && english <101){ system.out.println("you have a"); englishgpa = 4.0; system.out.println(englishgpa); } if (english < 94 && english >=90){ system.out.println("you have a-"); englishgpa = 3.7; system.out.println(englishgpa); } if (english < 90 && english >=87){ system.out.println("you have b+"); englishgpa = 3.3; system.out.println(englishgpa); } if (english < 87 && english >=80){ system.out.println("you have b"); englishgpa = 3.0; system.out.println(englishgpa); } if (english < 80 && english >=77){ system.out.println("you have b-"); englishgpa = 2.7; system.out.println(englishgpa); } if (english < 77 && english >=73){ system.out.println("you have c+"); englishgpa = 2.3; system.out.println(englishgpa); } if (english < 73 && english >=70){ system.out.println("you have c"); englishgpa = 2.0; system.out.println(englishgpa); } if (english < 70 && english >=67){ system.out.println("you have c-"); englishgpa = 1.7; system.out.println(englishgpa); } if (english < 67 && english >=67){ system.out.println("you have d+"); englishgpa = 1.3; system.out.println(englishgpa); } if (english < 67 && english >=63){ system.out.println("you have d"); englishgpa = 1.0; system.out.println(englishgpa); } if (english < 63 && english >=60){ system.out.println("you have d-"); englishgpa = 0.7; system.out.println(englishgpa); } if (english < 60){ system.out.println("you have f"); englishgpa = 0.0; system.out.println(englishgpa); }//end of english int science; double scigpa = 0; system.out.println("science = "); science= input.nextint(); if (science >100){ system.out.println("you have mistyped something"); } if (science >= 94 && science <101){ system.out.println("you have a"); scigpa = 4.0; system.out.println(scigpa); } if (science < 94 && science >=90){ system.out.println("you have a-"); scigpa = 3.7; system.out.println(scigpa); } if (science < 90 && science >=87){ system.out.println("you have b+"); scigpa = 3.3; system.out.println(scigpa); } if (science < 87 && science >=80){ system.out.println("you have b"); scigpa = 3.0; system.out.println(scigpa); } if (science < 80 && science >=77){ system.out.println("you have b-"); scigpa = 2.7; system.out.println(scigpa); } if (science < 77 && science >=73){ system.out.println("you have c+"); scigpa = 2.3; system.out.println(scigpa); } if (science < 73 && science >=70){ system.out.println("you have c"); scigpa = 2.0; system.out.println(scigpa); } if (science < 70 && science >=67){ system.out.println("you have c-"); scigpa = 1.7; system.out.println(scigpa); } if (science < 67 && science >=67){ system.out.println("you have d+"); scigpa = 1.3; system.out.println(scigpa); } if (science < 67 && science >=63){ system.out.println("you have d"); scigpa = 1.0; system.out.println(scigpa); } if (science < 63 && science >=60){ system.out.println("you have d-"); scigpa = 0.7; system.out.println(scigpa); } if (science < 60){ system.out.println("you have f"); scigpa = 0.0; system.out.println(scigpa); }//end of science int spanish; double spangpa = 0; system.out.println("spanish = "); spanish= input.nextint(); if (spanish >100){ system.out.println("you have mistyped something"); } if (spanish >= 94 && spanish <101){ system.out.println("you have a"); spangpa = 4.0; system.out.println(spangpa); } if (spanish < 94 && spanish >=90){ system.out.println("you have a-"); spangpa = 3.7; system.out.println(spangpa); } if (spanish < 90 && spanish >=87){ system.out.println("you have b+"); spangpa = 3.3; system.out.println(spangpa); } if (spanish < 87 && spanish >=80){ system.out.println("you have b"); spangpa = 3.0; system.out.println(spangpa); } if (spanish < 80 && spanish >=77){ system.out.println("you have b-"); spangpa = 2.7; system.out.println(spangpa); } if (spanish < 77 && spanish >=73){ system.out.println("you have c+"); spangpa = 2.3; system.out.println(spangpa); } if (spanish < 73 && spanish >=70){ system.out.println("you have c"); spangpa = 2.0; system.out.println(spangpa); } if (spanish < 70 && spanish >=67){ system.out.println("you have c-"); spangpa = 1.7; system.out.println(spangpa); } if (spanish < 67 && spanish >=67){ system.out.println("you have d+"); spangpa = 1.3; system.out.println(spangpa); } if (spanish < 67 && spanish >=63){ system.out.println("you have d"); spangpa = 1.0; system.out.println(spangpa); } if (spanish < 63 && spanish >=60){ system.out.println("you have d-"); spangpa = 0.7; system.out.println(spangpa); } if (spanish < 60){ system.out.println("you have f"); spangpa = 0.0; system.out.println(spangpa); }//end of spanish int religion; double rgpa = 0; system.out.println("religion = "); religion= input.nextint(); input.close(); if (religion >100){ system.out.println("you have mistyped something"); } if (religion >= 94 && religion < 101){ system.out.println("you have a"); rgpa = 4.0; system.out.println(rgpa); } if (religion < 94 && religion >=90){ system.out.println("you have a-"); rgpa = 3.7; system.out.println(rgpa); } if (religion < 90 && religion >=87){ system.out.println("you have b+"); rgpa = 3.3; system.out.println(rgpa); } if (religion < 87 && religion >=80){ system.out.println("you have b"); rgpa = 3.0; system.out.println(rgpa); } if (religion < 80 && religion >=77){ system.out.println("you have b-"); rgpa = 2.7; system.out.println(rgpa); } if (religion < 77 && religion >=73){ system.out.println("you have c+"); rgpa = 2.3; system.out.println(rgpa); } if (religion < 73 && religion >=70){ system.out.println("you have c"); rgpa = 2.0; system.out.println(rgpa); } if (religion < 70 && religion >=67){ system.out.println("you have c-"); rgpa = 1.7; system.out.println(rgpa); } if (religion < 67 && religion >=67){ system.out.println("you have d+"); rgpa = 1.3; system.out.println(rgpa); } if (religion < 67 && religion >=63){ system.out.println("you have d"); rgpa = 1.0; system.out.println(rgpa); } if (religion < 63 && religion >=60){ system.out.println("you have d-"); rgpa = 0.7; system.out.println(rgpa); } if (religion < 60){ system.out.println("you have f"); rgpa = 0.0; system.out.println(rgpa); }//end of religion answer(); }//end of main public static double answer() {//begin answer double sclass=0; system.out.println("do have gym semester?"); scanner input = new scanner(system.in); string yes = "yes"; string answer = input.nextline(); if (answer.equals(yes)){ } input.close(); return sclass; }//end answer }
the issue trying open 2 different scanner objects on same stream - system.in - @ same time (both open simultaneously, causing issue when second scanner tries read stream.
what can make answer() function accept scanner object parameter , use instead of creating new 1 on same stream.
example -
.... // lots of logic till here }//end of religion answer(input); }//end of main public static double answer(scanner input) {//begin answer double sclass=0; system.out.println("do have gym semester?"); string yes = "yes"; string answer = input.nextline(); if (answer.equals(yes)){ } input.close(); return sclass; }//end answer you need remove input.close(); well, close underlying stream system.in .
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