Talk:Java Training Course/JT04 - Revision history

imported>Gfis at 10:05, 24 September 2017

2017-09-24T10:05:53Z

← Older revision		Revision as of 10:05, 24 September 2017
Line 2:		Line 2:
	public class DupInt {		public class DupInt {
	public static void main(String[] args) {		public static void main(String[] args) {
	int st0 = Integer.parseInt(args[0]); // the 1st ~~parameter~~ on the commandline		int st0 = Integer.parseInt(args[0]); // the 1st argument on the commandline
	int st1 = Integer.parseInt(args[1]); // the 2nd ...		int st1 = Integer.parseInt(args[1]); // the 2nd ...
	int st2 = st0 + st1;		int st2 = st0 + st1;
Line 9:		Line 9:
	} // main		} // main
	} // DupInt		} // DupInt

	Output with different arguments:		Output with different arguments:
	georg@nunki:~/work/project/bekasi/JTC$ java DupInt 2 4		georg@nunki:~/work/project/bekasi/JTC$ java DupInt 2 4
Line 20:		Line 20:
	Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 0		Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 0
	at DupInt.main(DupInt.java:3)		at DupInt.main(DupInt.java:3)

			<code>parseInt(String)</code> is a <code>static</code> method in the Java class <code>java.lang.Integer</code> which attempts to convert a <code>String</code> and return an <code>int</code>. It fails if the <code>String</code> does not have the proper syntax of an <code>int</code>. We will later learn how to prevent this hard failure of the program by using a <code>try { ... } catch</code> block around sensible operations.

imported>Gfis at 19:55, 23 September 2017

2017-09-23T19:55:58Z

@@ Line 1: / Line 1: @@
   georg@nunki:~/work/project/bekasi/JTC$ java DupInt 2 4
   georg@nunki:~/work/project/bekasi/JTC$ java DupInt 2 -4
   -8

imported>Gfis: Created page with " georg@nunki:~/work/project/bekasi/JTC$ java DupInt 2 4 24 georg@nunki:~/work/project/bekasi/JTC$ java DupInt 2 -4 -8 georg@nunki:~/work/project/bekasi/JTC$ java DupInt 0..."

2017-09-22T19:20:17Z

Created page with " georg@nunki:~/work/project/bekasi/JTC$ java DupInt 2 4 24 georg@nunki:~/work/project/bekasi/JTC$ java DupInt 2 -4 -8 georg@nunki:~/work/project/bekasi/JTC$ java DupInt 0..."

New page

georg@nunki:~/work/project/bekasi/JTC$ java DupInt 2 4
24
georg@nunki:~/work/project/bekasi/JTC$ java DupInt 2 -4
-8
georg@nunki:~/work/project/bekasi/JTC$ java DupInt 0 -1
-4
georg@nunki:~/work/project/bekasi/JTC$ java DupInt
Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 0
at DupInt.main(DupInt.java:3)