"Crazy Java Handout" (19)----interacting with users

• Parameters for running Java programs

Java argstest Spring Java Hibernate

Args[0]--Spring

ARGS[1]--Java

ARGS[2]--Hibernate

• Get keyboard input using scanner

Scanner is a regular expression-based text scanner that resolves primitive type values and string values from File/input stream/String. The main use of the following two methods to scan the input:

1. 1. Hasnextxxx (): If there is a next entry, XXX can make a string of basic data types such as Int/long.
   2. Nextxxx (): Gets the next entry.

By default, scanner uses whitespace as a delimiter between multiple entries. You can use Usedelimiter (String pattern) to set the delimiter character. Hasnextline () and nextline () can be read row by line.

 Public class scannerkeyboardtest {    publicstaticvoid  main (string[] args) {         New Scanner (system.in);                  while (Sc.hasnext ()) {            System.out.println ("Input:" + Sc.next ());     }}}

 Public class scannerfiletest {    publicstaticvoidthrows  Exception {         New Scanner (new File ("Scannerfiletest.java"));                  while (Sc.hasnextline ()) {            System.out.println ("Input:" + Sc.nextline ());     }}}

• Get keyboard input using BufferedReader

ImportJava.io.BufferedReader;Importjava.io.IOException;ImportJava.io.InputStreamReader; Public classBufferedreadertest { Public Static voidMain (string[] args)throwsException {bufferedreader br=NewBufferedReader (NewInputStreamReader (system.in)); String Line=NULL;  while(line = Br.readline ())! =NULL) {System.out.println ("Input:" +Line ); }    }}

"Crazy Java Handout" (19)----interacting with users