Is there an equivalent method to C s scanf in Java

Question

Java has the notion of format strings  bearing a strong resemblance to format strings in other languages  It is used in JDK methods like String format   for output conversion   I was wondering if there an input conversion method akin to C s scanf in Java

User · Answer

You can format your output in Java as described in below code snippet.

public class TestFormat {

    public static void main(String[] args) {
      long n = 461012;
      System.out.format("%d%n", n);      //  -->  "461012"
      System.out.format("%08d%n", n);    //  -->  "00461012"
      System.out.format("%+8d%n", n);    //  -->  " +461012"
      System.out.format("%,8d%n", n);    // -->  " 461,012"
      System.out.format("%+,8d%n%n", n); //  -->  "+461,012"
   }
}

You can read more here.

User · Answer

There is not a pure scanf replacement in standard Java  but you could use a java util Scanner for the same problems you would use scanf to solve

User · Answer

Java always takes arguments as a string type    String args    so you need to convert in your desired type    Use Integer parseInt   to convert your string into Interger  To print any string you can use System out println     Example      int a    a   Integer parseInt args 0      and for Standard Input you can use codes like    StdIn readInt      StdIn readString

User · Answer

If one really wanted to they could make there own version of scanf   like so       import java util ArrayList      import java util Scanner   public class Testies    public static void main String   args        ArrayList lt Integer gt  nums   new ArrayList lt Integer gt         ArrayList lt String gt  strings   new ArrayList lt String gt             get input     System out println  Give me input         scanf strings  nums        System out println  Ints gathered            print numbers scanned in     for Integer num   nums           System out print num                   System out println   nStrings gathered            print strings scanned in     for String str   strings           System out print str                    System out println   nData         for int i 0  i lt strings size    i             System out println nums get i          strings get i                get line from system public static void scanf ArrayList lt String gt  strings  ArrayList lt Integer gt  nums       Scanner getLine   new Scanner System in       Scanner input   new Scanner getLine nextLine          while input hasNext                get integers         if input hasNextInt                 nums add input nextInt                          get strings         else if input hasNext                 strings add input next                           pass it a string for input public static void scanf String in  ArrayList lt String gt  strings  ArrayList lt Integer gt  nums       Scanner input    new Scanner in         while input hasNext                get integers         if input hasNextInt                 nums add input nextInt                          get strings         else if input hasNext                 strings add input next                             Obviously my methods only check for Strings and Integers  if you want different data types to be processed add the appropriate arraylists and checks for them   Also  hasNext   should probably be at the bottom of the if-else if sequence since hasNext   will return true for all of the data in the string   Output   Give me input          apples 8 9 pears oranges 5         Ints gathered          8 9 5          Strings gathered          apples pears oranges          Data          8 apples         9 pears         5 oranges  Probably not the best example  but  the point is that Scanner implements the Iterator class   Making it easy to iterate through the scanners input using the hasNext lt datatypehere gt    methods  and then storing the input

User · Answer

Take a look at this site  it explains two methods for reading from console in java  using Scanner or the classical InputStreamReader from System in   Following code is taken from cited website   import java io BufferedReader  import java io IOException  import java io InputStreamReader   public class ReadConsoleSystem     public static void main String   args         System out println  Enter something here            try          BufferedReader bufferRead   new BufferedReader new InputStreamReader System in            String s   bufferRead readLine             System out println s             catch IOException e                e printStackTrace                   --  import java util Scanner   public class ReadConsoleScanner     public static void main String   args           System out println  Enter something here               String sWhatever          Scanner scanIn   new Scanner System in          sWhatever   scanIn nextLine            scanIn close                       System out println sWhatever           Regards

User · Answer

THERE S an even simpler answer  import java io BufferedReader  import java util Scanner   public class Main        public static void main String   args                String myBeautifulScanf   new Scanner System in  nextLine            System out println  myBeautifulScanf

User · Answer

Not an equivalent  but you can use a Scanner and a pattern to parse lines with three non-negative numbers separated by spaces  for example   71 5796 2489 88 1136 5298 42 420 842   Here s the code using findAll   new Scanner System in  findAll     d      d      d              forEach result - gt                int fst   Integer parseInt result group 1                int snd   Integer parseInt result group 2                int third   Integer parseInt result group 3                int sum   fst   snd   third              System out printf   d    d    d    d   fst  snd  third  sum

[java] Is there an equivalent method to C's scanf in Java?

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