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POScanner.nextInt() Returns null
 

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  1. POScanner.nextInt() Returns null
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    <p>Edit: Yes, I know that <code>ScanObj</code> is not a proper name. And here is all of my code. It is not complete so there are some errors and some glitches, but you asked for it:</p> <pre><code>import java.awt.Color; import java.awt.Graphics; import java.awt.image.BufferedImage; import java.util.Scanner; import javax.swing.JFrame; public class MainClass { static String[][] medium = new String[5][4]; static String names[] = { "Gatz ", "Cat ", "Women", "Mice ", "Robin", "Romeo ", "Summer ", "Tempest", "Hamlet ", "Lear ", "Titanic ", "StarWars", "DieHard ", "Elf ", "RED " }; static String lexile[] = { "L:1070", "L:123 ", "L:9254", "L:1234", "L:534 ", "L:349", "L:632 ", "L:1097", "L:6453", "L:812 ", "L:NA ", "L:NA ", "L:NA ", "L:NA ", "L:NA ", "L:NA " }; static String grade[] = { "G:9", "G:10", "G:12", "G:11", "G:9", "G:12", "G:11", "G:9", "G:9", "G:12", "G:12", "G:11", "G:11", "G9", "G:9" }; static int max = 4; char sorttype = (Character) null; public static void main(String args[]) throws InterruptedException { System. out.println("Would you like to browse:\nB)Book C)CD or D)DVD"); Scanner ScanObj = new Scanner(System.in); String[] input = new String[10]; input[1] = ScanObj.nextLine(); int store[] = { 6, 6, 6, 6, 6, 6 }; if (input[1].equals("B") || input[1].equals("Book") || input[1].equals( "book") || input[1].equals("b")) { String temp[][] = new String[5][4]; int random[] = new int[5]; boolean repeat = true; int nums[] = new int[5]; for (int i = 0; i &lt; 5; i++) { temp[i][0] = "book"; temp[i][1] = names[i]; temp[i][2] = lexile[i]; temp[i][3] = grade[i]; for (int qwop = 0; qwop &lt; 4; qwop++) { medium[i][qwop] = temp[i][qwop]; if (qwop == 0) System. out.printf(i + 1 + " | "); else if (qwop &lt; 3) System. out.printf(medium[i][qwop] + " | "); else System. out.println(medium[i][qwop] + "\n"); Thread.sleep(150); } // System.out.println(temp[i][i]); // random = store[i]; if (i == 4) System. out.printf("\n\n\n"); } } if (input[1].equals("C") || input[1].equals("c") || input[1].equalsIgnoreCase( "CD") || input[1].equals("cd")) { String temp[][] = new String[5][4]; for (int i = 0; i &lt; 5; i++) { int random1 = (int) (Math.random() * max) + 6; for (int p = 0; p &lt; 4; p++) { for (random1 = (int) (Math.random() * max) + 6; random1 == store[p];) { random1 = ( int) (Math.random() * max) + 6; } } temp[i][0] = "CD"; temp[i][1] = names[i + 5]; temp[i][2] = lexile[i + 5]; temp[i][3] = grade[i + 5]; for (int qwop = 0; qwop &lt; 4; qwop++) { medium[i][qwop] = temp[i][qwop]; if (qwop &lt; 3) System. out.printf(medium[i][qwop] + " | "); else System. out.println(medium[i][qwop] + "\n"); Thread.sleep(150); } // System.out.println(temp[i][i]); random1 = store[i]; if (i == 4) System. out.printf("\n\n\n"); } } if (input[1].equalsIgnoreCase("D") || input[1].equalsIgnoreCase("DVD")) { String temp[][] = new String[5][4]; for (int i = 0; i &lt; 5; i++) { int random1 = (int) (Math.random() * max) + 6; for (int p = 0; p &lt; 4; p++) { for (random1 = (int) (Math.random() * max) + 6; random1 == store[p];) { random1 = ( int) (Math.random() * max) + 6; } } temp[i][0] = "DVD"; temp[i][1] = names[i + 10]; temp[i][2] = lexile[i + 10]; temp[i][3] = grade[i + 10]; for (int qwop = 0; qwop &lt; 4; qwop++) { medium[i][qwop] = temp[i][qwop]; if (qwop &lt; 3) System. out.printf(medium[i][qwop] + " | "); else System. out.println(medium[i][qwop] + "\n"); Thread.sleep(150); } // System.out.println(temp[i][i]); random1 = store[i]; if (i == 4) System. out.printf("\n\n\n"); } } // for loop goes through each of the parameters and compltes the // instructions System. out .println( "How would you like to sort?\nA)Name B) Lexile C) Grade Level"); input[2] = ScanObj.nextLine(); for (int i = 0; i &lt; 3; i++) { for (int j = 0; j &lt; 2; j++) { // if statement checks if the condition is true, then does the // instructions if it is // compareTo checks the ascii values of two strings. If the // second // is smaller (would come first in alphabetic order) it returns // -1 boolean mismatch = true; while (mismatch) { if (input[2].equalsIgnoreCase("a")) { mismatch = false; // makes a new temporary String String temp1 = null; // Switches the String at position i with the one above // it for (int z = 0; z &lt; medium.length - 1; z++) { for (int x = z + 1; x &lt; medium.length; x++) { if (medium[z][1].compareTo(medium[x][1]) &gt; 0) { for (int qwop = 0; qwop &lt; 4; qwop++) { temp1 = medium[z][qwop]; medium[z][qwop] = medium[x][qwop]; medium[x][qwop] = temp1; } mismatch = true; } } } } if (input[2].equalsIgnoreCase("b")) { mismatch = false; // makes a new temporary String String temp3 = null; // Switches the String at position i with the one above // it for (int z = 0; z &lt; medium.length - 1; z++) { for (int x = z + 1; x &lt; medium.length; x++) { if (medium[z][2].compareTo(medium[x][2]) &gt; 0) { for (int qwop = 0; qwop &lt; 4; qwop++) { temp3 = medium[z][qwop]; medium[z][qwop] = medium[x][qwop]; medium[x][qwop] = temp3; } mismatch = true; } } } } if (input[2].equalsIgnoreCase("c")) { mismatch = false; // makes a new temporary String String temp3 = null; // Switches the String at position i with the one above // it for (int z = 0; z &lt; medium.length - 1; z++) { for (int x = z + 1; x &lt; medium.length; x++) { // Here I encounter an error because compareTo() // sorts Lexicographically, meaning anything // starting with a 1 comes before anything // starting with a 2, 3, etc. This means that // Grade 11 comes before grade 9, and simply // comparing greater than does not work due to // the fact that they are Strings. if (medium[z][3].compareTo(medium[x][3]) &gt; 0) { for (int qwop = 0; qwop &lt; 4; qwop++) { temp3 = medium[z][qwop]; medium[z][qwop] = medium[x][qwop]; medium[x][qwop] = temp3; } mismatch = true; } } } } } } } Thread.sleep(1000); for (int prt = 0; prt &lt; medium.length; prt++) { for (int qwop = 0; qwop &lt; 4; qwop++) { if (qwop &lt; 3) System. out.printf(medium[prt][qwop] + " | "); else System. out.println(medium[prt][qwop]); } } Thread.sleep(1800); for (int t = 0; t &lt; 1000; t++) { System. out.println("\n\n\nTo edit a selection, type edit\n" + "To sort by a different category, type sort\n" + "To browse another medium, type browse\n" + "To search the " + medium[1][0] + "s, type search"); input[3] = ScanObj.nextLine(); if (input[3].equalsIgnoreCase("browse")) { Thread.sleep(500); System.out.println("What would you like to browse?:"); if (medium[1][0].equals("book")) { System.out.println("CDs, or DVDs"); input[4] = ScanObj.nextLine(); } if (medium[1][0].equals("CD")) { System.out.println("Books, or DVDs"); input[4] = ScanObj.nextLine(); } if (medium[1][0].equals("DVD")) { System.out.println("Books, or CDs"); input[4] = ScanObj.nextLine(); } if (input[4].equalsIgnoreCase("CD") || input[4].equalsIgnoreCase("DVD") || input[4].equalsIgnoreCase("Book")) { for (int i = 0; i &lt; 5; i++) { String temp[][] = new String[5][4]; temp[i][0] = "CD"; int addon = 0; if (input[4].equals("CD")) addon = 5; if (input[4].equals("DVD")) addon = 10; temp[i][1] = names[i + addon]; temp[i][2] = lexile[i + addon]; temp[i][3] = grade[i + addon]; for (int qwop = 0; qwop &lt; 4; qwop++) { medium[i][qwop] = temp[i][qwop]; if (qwop &lt; 3) System. out.printf(medium[i][qwop] + " | "); else System. out.println(medium[i][qwop] + "\n"); Thread.sleep(150); } } } } if (input[3].equalsIgnoreCase("edit")) { Thread.sleep(500); System. out.println("First type the number of the " + medium[1][0] + "\nyou want to edit"); int input4 = ScanObj.nextInt(); System. out .println( "Now, type the number of the column you want to edit"); int input5 = ScanObj.nextInt(); System. out.println("Now, make your edit:\n"); input[6] = ScanObj.nextLine(); medium[input4][input5] = input[6]; System. out.println(medium[input4][input5]); } for (int y = 0; y &lt; 10; y++) { if (input[3].equalsIgnoreCase("search")) { Thread.sleep(2000); System. out.println("Would you like to search by 1) Title or 2) Lexile #"); int input4 = 1; input4 = ScanObj.nextInt(); Thread.sleep(2500); System. out.println("Now Type your search"); input[5] = ScanObj.nextLine(); Thread.sleep(2500); for (int i = 0; i &lt; 5; i++) { System. out.println(input4 + ", " + input[5]); System. out.println(medium[i][input4]); if (input[5].compareToIgnoreCase(medium[i][input4]) == 0) { y = 10; System. out.println("why do you lie"); for (int r = 0; r &lt; 4; r++) { if (r &lt; 3) System. out.printf(medium[i][r] + " | "); else System. out.println(medium[i][r]); Thread.sleep(150); } } else System. out.println(medium[i][input4]); System. out.println("Couldn't find item, please search again:"); } } } } } } </code></pre> <p>Where <code>ScanObj</code> is my scanner. I'm just trying to get an <code>Integer</code> input, but it always returns <code>null</code>. What's wrong?</p>
    singulars
    1. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. PTQuestion
    1. USRy-
    1. USSam
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    1. VO
      singulars
      1. POScanner.nextInt() Returns null
      1. This table or related slice is empty.
      1. VTDownMod
    2. VO
      singulars
      1. POScanner.nextInt() Returns null
      1. This table or related slice is empty.
      1. VTModeratorReview
    1. COAnd take a look at the naming conventions. `ScanObj` is not a correctly formatted object name.
      singulars
      1. POScanner.nextInt() Returns null
      1. USchristopher
    2. COSo you are saying there is a bug in code you haven't provided and you what us to work out why a method might return `null`. Perhaps your method only ever returns `null` (just guessing) Shouldn't `nextInt()` return an `int` not an object anyway?
      singulars
      1. POScanner.nextInt() Returns null
      1. USPeter Lawrey
    3. CO… is your code actually formatted like that? i.e. two line breaks between most parts of the same statement? Why?
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      1. POScanner.nextInt() Returns null
      1. USRy-
 

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