Timestamp

 Метод valueOf() класса java.sql.Timestamp принимает значение String, представляющее метку времени в escape-формате JDBC, и преобразует данное значение String в объект Timestamp.


Timestamp.from - accepts Instant.
Timestamp.valueOf - accepts either String or LocalDateTime.


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Lesson1: JDK, JVM, JRE

Изображение
1. Compiler - takes the entire programming code written in high language and translates the whole of it into machine code at once. After this process the an executable file will be ready to run. The translation takes some times to be done, but after that execution is so fast. 2. Interpreter - takes each single instructions of the code translates it and then executes it on its own. The translation step is before the program runs is fast, but execution is slow. JDK = JRE + development tools JRE = JVM + library class JDK -> Java Development Kit. A kit which provides the environment to develop and execute (run) Java program. JRE -> Java Runtime Environment. Provides environment to only run. JVM -> Java Virtual Machine f * Compiled: Fortran, C, C++, Pascal, Haskell, Rust, Go * Interpreted: JavaScript, PHP, Python, Ruby Java both compiled and interpreted language. Terminalda : javac Main.java yazdiqda, source fayli(.java) bytecode(.class) faylina cevirir. Terminalda: java Main (bu z...
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SE_21_Lesson_9: Initialization Blocks, Wrapper types, String class

Изображение
-> static block: package org.example.test3 ; public class Blocks { static { System . out .println( "In static block" ) ; } public static void method () { System . out .println( "In static method" ) ; } } package org.example.test3 ; public class Main { public static void main ( String [] args ) { Blocks . method () ; } } -> Class.forName() metodunu ishe salmaq: package org.example.test3 ; public class Blocks { static { System . out .println( "In static block" ) ; } } package org.example.test3 ; public class Main { public static void main ( String [] args ) throws Exception { Class . forName ( "org.example.test3.Blocks" ) ; } } -> non-static (instance) block: package org.example.test3 ; public class Blocks { static { System . out .println( "in static block" ) ; } { System . out .println( "in non static (instance) block...
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SE_21_Lesson_11: Inheritance, Polymorphism

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