How to read input with multiple lines in Java

Question

Our professor is making us do some basic programming with Java  he gave a website and everything to register and submit our questions  for today I need to do this one example I feel like I m on the right track but I just can t figure out the rest  Here is the actual question     Sample Input    10 12 10 14 100 200    Sample Output    2 4 100   And here is what I ve got so far    public class Practice        public static int calculateAnswer String a  String b            return  Integer parseInt b  - Integer parseInt a               public static void main String   args            System out println calculateAnswer args 0   args 1               Now I always get the answer 2 because I m reading the single line  how can I take all lines into account  thank you  For some strange reason every time I want to execute I get this error   C  sonic gt java Practice class 10 12 Exception in thread  main  java lang NoClassDefFoundError  Fact Caused by  java lang ClassNotFoundException  Fact class         at java net URLClassLoader 1 run URLClassLoader java 20         at java security AccessController doPrivileged Native M         at java net URLClassLoader findClass URLClassLoader jav         at java lang ClassLoader loadClass ClassLoader java 307         at sun misc Launcher AppClassLoader loadClass Launcher          at java lang ClassLoader loadClass ClassLoader java 248 Could not find the main class  Practice class   Program will exit    Whatever version of answer I use I get this error  what do I do    However if I run it in eclipse Run as   Run Configuration -  Program arguments   10 12 10 14 100 200   I get no output  EDIT   I have made some progress  at first I was getting the compilation error  then runtime error and now I get wrong answer  so can anybody help me what is wrong with this   import java io BufferedReader  import java io IOException  import java io InputStreamReader  import java math BigInteger   public class Practice        public static BigInteger calculateAnswer String a  String b            BigInteger ab   new BigInteger a           BigInteger bc   new BigInteger b           return bc subtract ab              public static void main String   args  throws IOException           BufferedReader stdin   new BufferedReader new InputStreamReader System in             String line            while   line   stdin readLine       null  amp  amp  line length     0                 String   input   line split                    if  input length    2                     System out println calculateAnswer input 0   input 1

User · Answer

A lot of student exercises use Scanner because it has a variety of methods to parse numbers  I usually just start with an idiomatic line-oriented filter   import java io     public class FilterLine        public static void main String   args  throws IOException           BufferedReader in   new BufferedReader              new InputStreamReader System in            String s           while   s   in readLine       null                System out println s

User · Answer

public class Sol       public static void main String   args        Scanner sc   new Scanner System in        while sc hasNextLine         System out println sc nextLine

User · Answer

I finally got it  submited it 13 times rejected for whatever reasons  14th  the judge  accepted my answer  here it is    import java io BufferedInputStream  import java util Scanner   public class HashmatWarrior        public static void main String args              Scanner stdin   new Scanner new BufferedInputStream System in            while  stdin hasNext                  System out println Math abs stdin nextLong   - stdin nextLong

User · Answer

The easilest way is  import java util     public class Stdio4    public static void main String   args        int a 0      int arr     new int 3       Scanner scan   new Scanner System in       for int i 0 i lt 3 i                    a   scan nextInt       Takes input from separate lines          arr i  a              for int i 0 i lt 3 i                    System out println arr i        outputs in separate lines also

User · Answer

import java util    import java io     public class Main       public static void main String arg   throws IOException          InputStreamReader isr   new InputStreamReader System in           BufferedReader br   new BufferedReader isr           StringTokenizer st          String entrada                long x 0  y 0           while  entrada   br readLine     null               st   new StringTokenizer entrada                    while st hasMoreTokens                     x   Long parseLong st nextToken                     y   Long parseLong st nextToken                                System out println x gt y   x-y      y-x                           This solution is a bit more efficient than the one above because it takes up the 2 128 and this takes 1 308 seconds to solve the problem

User · Answer

Use BufferedReader  you can make it read from standard input like this   BufferedReader stdin   new BufferedReader new InputStreamReader System in    String line   while   line   stdin readLine       null  amp  amp  line length     0        String   input   line split           if  input length    2            System out println calculateAnswer input 0   input 1

User · Answer

Look into BufferedReader  If that isn t general high-level enough  I recommend reading the I O tutorial

User · Answer

package pac001   import javax swing JFrame  import javax swing JOptionPane   public class Entry box         public static final String   relationship     Marrid    Unmarried          public static void main String   args                   TAKING USER ID NUMBER             int a   Integer parseInt JOptionPane showInputDialog  Enter ID no                  TAKING INPUT FOR RELATIONSHIP         JFrame frame   new JFrame  Input Dialog Example  3            String Relationship      String  JOptionPane showInputDialog frame  Select Your Relationship   Married                                   JOptionPane QUESTION MESSAGE  null  relationship relationship 0                 PRINTING THE ID NUMBER         System out println  ID no    a              PRINTING RESULT FOR RELATIONSHIP INPUT           System out printf  Mariitual Status   s n   Relationship

User · Answer

This is good for taking multiple line input  import java util Scanner  public class JavaApp       public static void main String   args           Scanner scanner   new Scanner System in           String line          while true               line   scanner nextLine                System out println line               if line equals                       break

User · Answer

The problem you re having running from the command line is that you don t put   class  after your class file   java Practice 10 12   should work - as long as you re somewhere java can find the  class file    Classpath issues are a whole  nother story  If java still complains that it can t find your class  go to the same directory as your  class file  and it doesn t appear you re using packages     and try -  java -cp   Practice 10 12

[java] How to read input with multiple lines in Java

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