As of today, I’ve tried the program on both my Windows and my Linux systems. It seems to work well on both.<\/p>\n The point of the program is to test the Java Scanner’s ability to find numbers among other text. For instance, does it know that $45.67 is a number? How about 4.1e-2 (0.041 in scientific notation). Or 6.75d? (The “d” indicates type “double” in some Java contexts.)<\/p>\n In the program, the wordings and mean that the scanner is looking for numbers of “double” type; i.e., decimals. (Using other methods, the scanner could be set to look for integers, strings, or other types of values.)<\/p>\n I first compiled the program thus: Afterwards, I ran several tests. Here’s one of my command line calls: The output: So we see that the Java Scanner, in this example anyway, does not appreciate that $76.51 means a number. It does, however, recognize 4.2e-3 as 0.0042, and 45 as 45.0.<\/p>\n The call above was done on Windows; my Linux system mostly agrees, but not in every case (surprise, surprise….:) More on that next time.<\/p>\n I realize that, with Java programming, I’ve opened an accordion file that could wrap around the world. <\/p>\n Source:<\/p>\n docs.oracle.com<\/a><\/p>\n
\nIn yesterday’s post<\/a> I introduced a short program to test an instance of the Java Scanner.<\/p>\n
\n
\nscan0.hasNextDouble()
\n<\/span><\/p>\n
\n
\nscan0.nextDouble()
\n<\/span><\/p>\n
\n
\njavac TryScanner.java
\n<\/span><\/p>\n
\n
\njava -cp . TryScanner 78.1 here 45 $76.51 4.2e-3 655.2d<\/p>\n
\n
\nReadable number: 78.1
\nNot a readable number: here
\nReadable number: 45.0
\nNot a readable number: $76.51
\nReadable number: 0.0042
\nNot a readable number: 655.2d
\nSee you again:)
\n<\/span><\/p>\n