HashSet vs LinkedHashSet
The answer lies in which constructors the LinkedHashSet uses to construct the base class: And (one example of) a HashSet constructor that takes a boolean argument is described, and looks like this:
java
java.util.IllegalFormatConversionException
%d goes with integer in Java. Use %f instead in your printf() Another useful info. If you use %.02f then it will print only two decimal point value after the dot .
Android Studio ERROR: Cannot resolve symbol ‘View’
I think you forget to include the import statement for View. Add the following import in your code
What is the difference between i++ & ++i in a for loop?
They both increment the number. ++i is equivalent to i = i + 1. i++ and ++i are very similar but not exactly the same. Both increment the number, but ++i increments the number before the current expression is evaluted, whereas i++ increments the number after the expression is evaluated.
Java project in Eclipse: The type java.lang.Object cannot be resolved. It is indirectly referenced from required .class files
This is an annoying Eclipse Bug which seems to bite now and then. See http://dev-answers.blogspot.de/2009/06/eclipse-build-errors-javalangobject.html for a possible solution, otherwise try the following; Close the project and reopen it. Clean the project (It will rebuild the buildpath hence reconfiguring with the JDK libraries)OR Delete and Re-import the project and if necessary do the above steps again. The … Read more
“Expression expected” and “Cannot find symbol” error
You should be using variable name of the array instead of classname. I see you fixed the other firsmachine() related things
Checking to see if array is full
Since you are using array, the size of array is determined during compilation. Thus if your intention is to check whether current array’s index has reached the last array element, you may use the following condtion (possibly in a loop) to check whether your current array index is the last element. If it is true, … Read more
Exception in thread “main” java.net.NoRouteToHostException: No route to host
The exception typically indicates a network routing problem of some kind. This may be the result of a problem with the network configuration in you LAN or WAN, or it may be a result of a network link or switch outage. It can even be cause by failure of the host that you are trying … Read more
Cannot resolve symbol ‘button’ -Android Studio
Here are some things you might have forgotten to do: Name your button (give it an id), I think they’re named button1, button2, … by default Use a capital B when declaring the button object: Button myButton = new Button(“play music”); You should make sure you have Button imported in the activity where you want … Read more
Why do some classes require main methods and others do not?
Every Java program (which is in turn, built up from one or more Java classes) requires a Main method. The purpose of this special method is to serve as an entry point to your program so that your program can be executed. More information can be found in this page. In your Pie example, what happens is that when … Read more