“Source folder is not a Java project” error in eclipse
In the maven project directory try that may do the trick.
java
Getting “unixtime” in Java
Avoid the Date object creation w/ System.currentTimeMillis(). A divide by 1000 gets you to Unix epoch. As mentioned in a comment, you typically want a primitive long (lower-case-l long) not a boxed object long (capital-L Long) for the unixTime variable’s type.
Throwing multiple exceptions in Java
Is there any way to throw multiple exceptions in java?
How to really read text file from classpath in Java
With the directory on the classpath, from a class loaded by the same classloader, you should be able to use either of: If those aren’t working, that suggests something else is wrong. So for example, take this code: And this directory structure: And then (using the Unix path separator as I’m on a Linux box): … Read more
How to return nothing from a function that returns value?
Your function does not have a return for every possible circumstance. You have: What do you return if it is not null, and goes to the final else? Nothing is returned. You can either return getParent… in the else statement. or return null at the end of the function (not in an if or else … Read more
Can we execute a java program without a main() method? [duplicate]
Now – no Prior to Java 7: Yes, sequence is as follows: jvm loads class executes static blocks looks for main method and invokes it So, if there’s code in a static block, it will be executed. But there’s no point in doing that. How to test that: Then if you try to run the … Read more
Java equivalent of unsigned long long?
I don’t believe so. Once you want to go bigger than a signed long, I think BigInteger is the only (out of the box) way to go.
Java ArrayList of Doubles
Try this: which returns a fixed size list. If you need an expandable list, pass this result to the ArrayList constructor:
Why is Netbeans suggesting I “Flip operands of the binary operators” in my Java code
Netbeans frequently suggests that I “flip operands of the binary operator” when I’m doing mathematical calculations. For example, in the following line of code: Netbeans makes the suggestion for every mathematical symbol (so it does it three times in the ‘pennies’ line. I’m not sure I understand why it’s making the suggestion. If I were … Read more
Printing array elements with a for loop
This is a challenge question from my online textbook I can only get the numbers to prin forward… 🙁 Write a for loop to print all elements in courseGrades, following each element with a space (including the last). Print forwards, then backwards. End each loop with a newline. Ex: If courseGrades = {7, 9, 11, … Read more