Showing posts with label qjava. Show all posts
Java notice
at
May 26, 2021
1 Enum quang trọng thứ tự trong khai báo nó sẽ quy định ra get ra cái gì 2) Sort 3 Rounding value in java 3.1 Rounding value number...
Khác biệt giữa Primitive datatype và refercen Datatype
at
April 26, 2021
Primitive datatype và refercen Datatype Default value and Null Lưu trữ chúng Sử dụng toán tử = operator So sánh sử dụng == Return Giá trị...
Operator dot and Double Colon in Functional Interface
at
January 01, 2021
Practical Example: Question : Stream<T> filter(Predicate<? super T> predicate); void forEach(Consumer<? super T> act...
Relation Static with others
at
December 29, 2020
Fuctional Static only use anything belong to class not object (variable, functional static). Functional normal use anything both static and ...
Questions Java Compiler and runtime
at
December 04, 2020
1) Can you save java source file by other name than the class name ? Answer: Yes, if the class in file not pulbic. the figure bellow: Compil...
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- Tân An, Long An, Vietnam
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The one of Design Pattern Series, this is factory design for createnal pattern. Please read in the linked document. Link document: https:...
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youtube tutorial: https://www.youtube.com/watch?v=IEf1KAcK6A8 1 let and scope, 2 const, 3 array function 4 default value 5 Object iteral ext...
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1 Copy Object in java Use = for immutable class ex: Integer , String or Wrapper classes Object Use Contructor has paramater copy, ObjectA...
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JPA find() & getReference() in javax.persistence.EntityManager * find (): always call select from DB Use for select one entity from DB...
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Preface Trong java có 3 kiểu so sánh đặc trưng như sau: + Sử dụng toán tử == : return Boolean Primitive thì so sánh giá trị thực, Reference ...
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Persistence Context has two implemnet is JPA EntityManage and Hiberbate Session Example use Session of hiberate has exist github you can vi...
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1 check Null and Undefined And primative datatype if(object){ // object is not null, undefined, 0, '', false. but it can empty({})...
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1) CRUD có thể sử dung find Compositekey hoặc findBy compositeket + column in composite 2) CRUD findBy column And column 3 Not LazyLoa...
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This post use language vietnames is, the future is will introduce english version. The clean code for java also application for the others. ...
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Parse LocalDateTime to String to pattern year : yyyy || 2021 month of year: M / MMM / MMMM || 06 / Jun / June da...