Search results
Jul 18, 2023 · Integer.valueOf(s) is similar to. new Integer(Integer.parseInt(s)) The difference is valueOf() returns an Integer, and parseInt() returns an int (a primitive type). Also note that valueOf() can return a cached Integer instance, which can cause confusing results where the result of == tests seem intermittently correct.
import java.lang.reflect.Method; import java.lang.reflect.Modifier; import java.util.EnumSet; public class EnumUtil { /** * Returns the <code>Enum</code> of type <code>enumType</code> whose a * public method return value of this Enum is * equal to <code>valor</code>.<br/> * Such method should be unique public, not final and static method ...
Mar 12, 2012 · Since you cannot override valueOf method you have to define a custom method (getEnum in the sample code below) which returns the value that you need and change your client to use this method instead. StartHere("Start Here"), StopHere("Stop Here"); private String value; RandomEnum(String value) {. this.value = value;
Nov 16, 2010 · Nov 16, 2010 at 19:34. 1. No, the valueOf method only works with the Java name of the enum (i.e. ENGLISH in your example). You must use the find method also for those cases. Unless all have a single value, but then this is the wrong post :) – Flavio. Feb 17, 2013 at 22:58.
Nov 24, 2015 · 23. Because String.valueOf() returns a String representation, which for a null is "null". The developer shouldn't be checking the return value at all, since it's meant for display purposes, not for checking whether a reference was null or not. bad design. String.valueOf ("null") == String.valueOf (null).
Sep 29, 2020 · 60. You should get an IllegalArgumentException if the name is not that of an enum (which it won't be for the empty string). This is generated in the API docs for all enum valueOf methods. You should get a NullPointerException for null. It's probably not a good idea to give a dummy value to your String variable (nor to allow the last case ...
Aug 24, 2011 · If you would rather not have to deal with exceptions, then create a Map of your values within the enum and effectively do the equivalent of valueOf () from a lookup which returns null if it is not found. public enum WeekDay {. MONDAY, TUESDAY, WEDNESDAY, THURSDAY, FRIDAY; private static Map<String, WeekDay> valueMap;
Sep 15, 2017 · using the only syntax String.valueOf () can whatever you pass as a parameter is converted to String and returned.. Otherwise, if you use Integer.toString (),Float.toString () etc. (i.e. SomeType.toString ()) then you will have to check the datatype of parameter that you want to convert into string.
The way I know how to convert an integer into a string is by using the following code: Integer.toString(int); and. String.valueOf(int); If you had an integer i, and a string s, then the following would apply: int i; String s = Integer.toString(i); or. String s = String.valueOf(i);
Jun 28, 2010 · Therefore, char[] is more specific than Object, and as specified by the Java language, the String.valueOf(char[]) overload is chosen in this case. String.valueOf(char[]) expects the array to be non- null, and since null is given in this case, it then throws NullPointerException. The easy "fix" is to cast the null explicitly to Object as follows:
