I am programming in java. Say I have an custom object Item I have list of Items. Now, What is best way in java to know, list of Items contain some Items with same value for itemNumber. Answer To search for a specific item with some item number: To get lists of items for all item numbers: You can use
Tag: java
TextView cannot be cast to EditText
First time posting a question to this site so I might make some mistakes! I’m new to programming and getting the following error when running an application in Android Studio: The code that’s causing this issue is I’ve tried to delete the R.java files and clean the project but it didn’…
Can I force Maven to package a jar despite compilation errors?
So I run maven package to build my dependencies into a jar. However, I need Maven to ignore any compilation errors and package the jar regardless. How would this be accomplished? My pom.xml is as follows: Searching through SO only showed me how to ignore compilation errors from unit testing. I simply want my …
Difference between uppercase and titlecase
What’s the difference between uppercase and titlecase. Frankly, I never heard of titlecase before. In java there are seperate methods for both: Character.isTitleCase(char) Character.isUpperCase(char) Some websites define it as follows: TitleCase: Matches characters that combine an uppercase letter with …
File Upload Using Feign – multipart/form-data
I’m trying to accomplish a multipart file upload using feign, but I can’t seem to find a good example of it anywhere. I essentially want the HTTP request to turn out similar to this: Or even… Do I need to manually build the request body, including generating the multipart boundaries? That se…
A utility method representing, “Both not null and not equal” in Java
Comparing this string variable like the following. In case str is null, it will cause a java.lang.NullPointerException to be thrown as obvious. To avoid that, an additional null check may be enforced. Such as, I find it plain ugly. Better could be rewritten as follows. This will never throw a java.lang.NullPo…
Calculate Xmx setting and actual heap size from Java dump
I’ve got a heap dump file (java_dump.hprof) written by a Java 7 JVM. Is it somehow possible to calculate the Xmx command line option as well as the actual heap size from this dump? Answer The dump is based on the size actually used but in a different format so it could be bigger. If the dump was trigger…
How to remove the brackets [ ] from ArrayList#toString()?
I have created an Array List in Java that looks something like this: When I print errors I get it errors as [1,2,3,4,5,6,7,8,9] Now I want to remove the brackets([ ]) from this array list. I thought I could use the method errors.remove(“[“), but then I discovered that it is just boolean and displa…
Intellij-idea reverse paste into string (aka copy from string)?
In Intellij idea if you paste some text into a string literal (between double quotes) the java editor can automatically reformat the pasted text – ie to place necessary escaping characters for double quotes new lines etc. I want to do reverse, ie when copying text from inside a string literal the editor…
How to update xml files in java
I have a xml file call data.xml like the code below. The project can run from client side no problem and it can read the xml file. The problem I have now is I I want to write a function that can update the startdate and enddate. I have no idea how to get start. Help will be appreciated. my