Since there are several answers here showing non-working code for Windows, here is a clarification: This command does not work, for two reasons: There is no executable named cls.exe or cls.com in a standard Windows installation that could be invoked via Runtime.exec, as the well-known command cls is builtin to Windows’ command line interpreter. When launching a new process via Runtime.exec, the standard output gets … Read more
keySet() only returns a set of keys from your hash map, you should iterate this key set and the get the value from the hash map using these keys. In your example, the type of the hash map’s key is TypeKey, but you specified TypeValue in your generic for-loop, so it cannot be compiled. You should change it to: Update … Read more
The parent class’ constructor needs to be called before the subclass’ constructor. This will ensure that if you call any methods on the parent class in your constructor, the parent class has already been set up correctly. What you are trying to do, pass args to the super constructor is perfectly legal, you just need … Read more
You can convert, but I don’t think there’s anything built in to do it automatically: (Note that this will throw a NullPointerException if either integers or any element within it is null.) EDIT: As per comments, you may want to use the list iterator to avoid nasty costs with lists such as LinkedList:
Your problem is that you’re creating a BoxLayout for a JFrame (this), but setting it as the layout for a JPanel (getContentPane()). Try:
Are they in the right subdirectories? If you put /usr/share/stuff on the class path, files defined with package org.name should be in /usr/share/stuff/org/name. EDIT: If you don’t already know this, you should probably read this doc about understanding classpath. EDIT 2: Sorry, I hadn’t realised you were talking of Java source files in /usr/share/stuff. Not only they need to be in the … Read more
If you look at the scope of the variable ‘hoursWorked’ you will see that it is a member of the class (declared as private int) The two variables you are having trouble with are passed as parameters to the constructor. The error message is because ‘hours’ is out of scope in the setter.
public static byte[] m16h(byte[] m) throws Exception The signature of your method indicates that an Exception is susceptible of being thrown. This means that the exception either : Must be handled by the callertry { System.out.println(xor(m16h(add(xor(xor(m16h(add(k1, m16h(add(k2, m16h(k3))))), k3), k2), k1)), k3)); } catch (Exception e) { e.printStackTrace(); } Must be rethrowed by the callerpublic … Read more
Cause: The error occurred since hibernate is not able to connect to the database.Solution:1. Please ensure that you have a database present at the server referred to in the configuration file eg. “hibernatedb” in this case.2. Please see if the username and password for connecting to the db are correct.3. Check if relevant jars required for … Read more
This first removes all non-letter characters, folds to lowercase, then splits the input, doing all the work in a single line: Spaces are initially left in the input so the split will still work. By removing the rubbish characters before splitting, you avoid having to loop through the elements.