Integer.parseInt has a funny side effect though. It will convert 000 to 0, 03 to 3 and so on.
Code:
import java.util.Date; // mandatory only for the "current date and time" part
public class prob4
{
public static void main(String args[])
{
String ArgumentFromCommandLine = "";
int time = 0;
// exit program if the supplied argument is not an integer OR
// if no or too many arguments were supplied
if (args.length == 1) {
try {
ArgumentFromCommandLine = args[0];
time = Integer.parseInt(ArgumentFromCommandLine);
} catch (NumberFormatException e) {
System.err.println("Argument " + args[0] + " must be an integer.");
System.exit(1);
}
}
else {
System.err.println("No or too many arguments were supplied.");
System.exit(1);
}
// collect all values
Long utms = System.currentTimeMillis(); // UNIX time in milliseconds
Long uts = utms / 1000; // UNIX time in seconds
Long utd = uts / 86400; // UNIX time in days
Date dateandtime = new Date(); // Current date and time, default format
// print requested value
switch ( time )
{
case 0:
System.out.println("Milliseconds since 1970: " + utms);
break;
case 1:
System.out.println("Seconds since 1970: " + uts);
break;
case 2:
System.out.println("Days since 1970: " + utd);
break;
case 3:
System.out.println("Current date and time: " + dateandtime);
break;
default:
System.out.println("Invalid");
}
}
}
Oh, thank you so much! That really helps me a lot.
Hello everybody,
I have a problem about running a java class with a cron :
I have Cron.txt file which has :
0,5,10,15,20,25,30,35,40,45,50,55 * * * * CronJava.txt
I have CronJava.txt wihich has :
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Like class loader in java, can we make a function loader in shell script, for this can someone throw some light on how internally bash runs a shell script , what happenes in runtime ...
thanks in advance.. (1 Reply)
Hi,
Is it possible to call the constructur of a java class in a shell script?
I know you can call static methods, but can you also call the constructor?
tnx. (1 Reply)
Hi, everyone:
I'm trying to connect to DB using JDBC on fedora. I have successfully installed jdk and it's ok to run common java program.
The environment variables:
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Hi all!
I am trying to register a device in an existing device class, but I am
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*cl = class_create(THIS_MODULE, className);... (0 Replies)
I am trying to verify my understanding on setter and getter on java class with this example:
//MaximumFinder2.java
import java.util.Scanner;
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Discussion started by: yifangt
6 Replies
LEARN ABOUT OSX
jvisualvm
jvisualvm(1) General Commands Manual jvisualvm(1)NAME
jvisualvm - Java Virtual Machine Monitoring, Troubleshooting, and Profiling Tool
SYNOPSIS
jvisualvm [ options ]
PARAMETERS
Options, if used, should follow immediately after the command name. Options may be in any order. For a discussion of parameters that apply
to a specific option, see OPTIONS below.
DESCRIPTION
Java VisualVM is an intuitive graphical user interface that provides detailed information about Java technology-based applications (Java
applications) while they are running on a given Java Virtual Machine (JVM(*)). The name Java VisualVM comes from the fact that Java Visu-
alVM provides information about the JVM software visually.
Java VisualVM combines several monitoring, troubleshooting, and profiling utilities into a single tool. For example, most of the function-
ality offered by the standalone tools jmap, jinfo, jstat and jstack have been integrated into Java VisualVM. Other functionalities, such as
some of those offered by the JConsole tool, can be added as optional plug-ins.
OPTIONS
The following option is possible when you launch Java VisualVM.
-J<jvm_option>
Pass this <jvm_option> to the JVM software.
USAGE
Java VisualVM is useful to Java application developers to troubleshoot applications and to monitor and improve the applications' perfor-
mance. Java VisualVM can allow developers to generate and analyse heap dumps, track down memory leaks, perform and monitor garbage collec-
tion, and perform lightweight memory and CPU profiling. Plug-ins also exist that expand the functionality of Java VisualVM. For example,
most of the functionality of the JConsole tool is available via the MBeans Tab and JConsole Plug-in Wrapper plug-ins. You can choose from a
catalog of standard Java VisualVM plug-ins by selecting 'Tools' | 'Plugins' in the Java VisualVM menus.
Start Java VisualVM with the following command:
% jvisualvm <options>
SEE ALSO
For more details about Java VisualVM see the following pages.
o Java VisualVM developers' site @
https://visualvm.dev.java.net
o Java VisualVM in Java SE platform documentation @
http://java.sun.com/javase/6/docs/technotes/guides/visualvm/index.html
(* The terms "Java Virtual Machine" and "JVM" mean a Virtual Machine for the Java platform.)
26 Mar 2008 jvisualvm(1)
11-09-2014
