That’s because the Scanner.nextInt method does not read the newline character in your input created by hitting “Enter,” and so the call to Scanner.nextLine returns after reading that newline. You will encounter the similar behaviour when you use Scanner.nextLine after Scanner.next() or any Scanner.nextFoo method (except nextLine itself). Workaround: Either put a Scanner.nextLine call after … Read more
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
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
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
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.
Try this: which returns a fixed size list. If you need an expandable list, pass this result to the ArrayList constructor:
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
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
System.out is based around a PrintStream which by default flushes whenever a newline is written. From the javadoc: autoFlush – A boolean; if true, the output buffer will be flushed whenever a byte array is written, one of the println methods is invoked, or a newline character or byte (‘\n’) is written So the println … Read more
java.io.IOException: Connection reset by peer The other side has abruptly aborted the connection in midst of a transaction. That can have many causes which are not controllable from the server side on. E.g. the enduser decided to shutdown the client or change the server abruptly while still interacting with your server, or the client program … Read more