I have two list of different Objects. I want to remove the list of School objects from List of World objects based on schoolName and location. I cannot use equals and hashCode methods on those two fields as it is creating some other problem. Please help me how it can be done using streams. Answer You can use filter:
Tag: list
Java: Order a list of Objects based on Calendar date?
I have a list of Java Objects that all contain the following field: I want to order the list of objects based on the above field , the object with date field most recent first. What is the best way to do so? Answer You can use Comparator.comparing, suppose you have List<Entity> then you can do this way
JPA – Adding and Removing elements in List with ElementCollection
I keep a list of Strings in SQL as @ElementCollection, my main usage is similar to a Queue: fetch it from the database run some calculations remove the first element and insert a new element to the end of the list: this.measurements.remove(0); this.measurements.add(measurement); save it to the database The problem with the current implementation is that removing the first element
Multiple filters applied to a single list in Java 8+
How can be achieved to pass a “list of filters” to a stream in Java 8, instead of applying them individually as illustrated in the following example? https://howtodoinjava.com/java8/stream-multiple-filters-example/ The purpose would be to dynamically create a list of filters, one way would be to iterate through a list of filters and apply it to the list to be filtered. Any
How to disable a button and clear an arraylist?
i have some button and arraylist, my button have condition if(list.isEmpty){ button.setEnabled(false) } and textTotalFinalPrice set value to 0 but in my case , that function actually …
In Java how do you pass variables and lists between jframe components
I have created a simple program with a list object. I also have a simple UI and want to add the values from the different parts of the list to the text frames and labels but cannot find how to pass the values that are needed. The list object has been created in the main class of the UI (which
How to remove an item from List?
I’m developing an app, which contains a list of tickets, there are add ticket and remove ticket options for the user. The add option works fine, but the remove option doesn’t, here is the ticket list code The delete function in another activity which doesn’t work: While the add function works fine: Can anyone tell me what’s wrong with the
How to initialize List Of List in one line [closed]
Closed. This question needs details or clarity. It is not currently accepting answers. Want to improve this question? Add details and clarify the problem by editing this post. Closed 4 years ago. This post was edited and submitted for review 11 months ago and failed to reopen the post: Original close reason(s) were not resolved Improve this question How can
Java quiz with multi choices in answers
I’m trying to develop a java quiz, here’s the basic idea: A quiz contains n questions, and a question has 0 to n true answers, I have to link that to a database, so my tables are: Table Quiz: Table Question: Table answer: So my java classes are: My Question class: and the same for Answer: The main JFrame contains
List of array in Android
I am creating OMR scanner in java. I have List of which contains contours from image. i want to create array of List. how can i accomplish it? this is what i have right now What i want to do is so that i can store array of countours() for each question. Like [1] contour1,contour2,contour3,contour4,contour5 [2] contour1,contour2,contour3,contour4,contour5 [3] contour1,contour2,contour3,contour4,contour5 ………………………….