I’m trying to make a program that consists of an array of 10 integers which all has a random value, so far so good. However, now I need to sort them in order from lowest to highest value and then print it onto the screen, how would I go about doing so? (Sorry for having … Read more
From Effective Java by Joshua Bloch, Arrays differ from generic type in two important ways. First arrays are covariant. Generics are invariant. Covariant simply means if X is subtype of Y then X[] will also be sub type of Y[]. Arrays are covariant As string is subtype of Object So String[] is subtype of Object[] … Read more
Is there a way to extract the source code from an executable .jar file (Java ME)? 11 Answers 11
This question already has answers here: Different between parseInt() and valueOf() in java? (11 answers) Closed 4 years ago. Aside from Integer.parseInt() handling the minus sign (as documented), are there any other differences between Integer.valueOf() and Integer.parseInt()? And since neither can parse , as a decimal thousands separator (produces NumberFormatException), is there an already available … Read more
This question already has answers here: Closed 11 years ago. Possible Duplicate: Differences betweeen Exception and Error How can I differentiate between Errors and Exceptions in Java? 4 Answers 4
This question already has answers here: Is there a concise way to iterate over a stream with indices in Java 8? (23 answers) Closed 8 years ago. Is there a way to build a forEach method in Java 8 that iterates with an index? Ideally I’d like something like this: params.forEach((idx, e) -> query.bind(idx, e)); … Read more
I am trying to match a multi line text using java. When I use the Pattern class with the Pattern.MULTILINE modifier, I am able to match, but I am not able to do so with (?m). The same pattern with (?m) and using String.matches does not seem to work. I am sure I am missing … Read more
How do I create a new URL object using a local file, for the purpose of unit tests? 8 Answers 8
I’m trying to understand a byte[] to string, string representation of byte[] to byte[] conversion… I convert my byte[] to a string to send, I then expect my web service (written in python) to echo the data straight back to the client. When I send the data from my Java application… Arrays.toString(data.toByteArray()) Bytes to send.. … Read more
I have a piece of Java code which uses an environment variable and the behaviour of the code depends on the value of this variable. I would like to test this code with different values of the environment variable. How can I do this in JUnit? I’ve seen some ways to set environment variables in … Read more
