productionsvur.blogg.se - Kotlin null safety

In fact, Java's syntax shares some similarities with C and C++ but provides fewer lower-level facilities. Moreover, Java is statically typed, performing type checking during compile time. In addition, since it is compiled to bytecode, it can run on any Java Virtual Machine (JVM). As a multiplatform language, Java works on almost any device, operating system, and server. It is an open-source, general-purpose, object-oriented programming language. Java was launched in 1995 and developed by James Gosling at Sun Microsystems (which in 2009 was acquired by Oracle). Functional Programming: Higher-Order Functions and Lambdas Afterward, we'll discuss whether Kotlin is or not better than Java and highlight the main reasons. Facebook Linkedin Image of Kotlin logo versus Java logo.ĭo you prefer Kotlin or Java for Android development? This article seeks to explain the 12 main differences between both programming languages. Numeric constants.Shape Created with Sketch. The example demonstrates the declaration and use of nullable variables of different types. If a variable is declared as a nullable variable, then it can be assigned the null value.

Type – any basic type of the Kotlin language ( Int, Double, Byte, Short, UByte, Char, String and others).

This is done by adding the symbol ? (question mark) to type name Type? Unlike the Java language (as well as other languages), Kotlin allows the programmer to directly specify nullable types. Declaration of variables that support null-value (nullable-variables).

This is a significant advantage of the Kotlin language. That is, the error can be immediately identified and corrected, otherwise the program code will not be compiled. In the Kotlin language, the type system is organized in such a way that errors using nullable types are already detected at compile time. As a consequence, an exception is thrown (in Java it is a ), which is a consequence of the fact that the compiler was unable to detect an error during the compilation of the program. In other programming languages (Java in particular), incorrect use of nullable elements leads to run-time errors, which is very undesirable. When writing programs, it is important to use nullable elements correctly to avoid errors. non-nullable – elements that cannot take a null value.

nullable are elements that can take a null value.Based on this context, Kotlin language elements are divided into two types: In the Kotlin language, null means that there is no value for variables declared as val or var at the moment. The terms null-value and zero-value are different things. In modern programming languages (including Java, C#, etc.) there are situations when a value does not contain any value.