Use MapStruct to convert member variable to id (and vice versa)

In my SpringBoot application, I have two entities User and Role with public class User { private Long id; private String email; private String password; private Set roles; …

Java – White space with Integer.valueOf() causes java.lang.NumberFormatException [closed]

If you try: Integer.valueOf(” 00″); …a java.lang.NumberFormatException is thrown. So, this is easy enough to fix by stripping any white space, even for a Java noob like me, but I’d very much …

How to convert short[] into List in Java with streams?

I figured I could extrapolate from this question but I can’t I can of course do short[] shortarray = {0,1,2}; List shortList = new ArrayList(); for (Short s : shortarray) { …

Cannot invoke charAt(int) on the array type String[]

I’m doing a function that counts digits in a string: int countOccurences(String str) { // split the string by spaces in a String a[] = str.split(” “); // search for pattern in a int …