Awesome! val z: View = findViewById(R.id.my_view)ĭid you see that I did not call setText() ? I will explain it in next articles! 4. Whenever the compiler is able to detect that there is no other possible option, the casting will be done automatically. Spoiler: As you see, you do not need to use new to create a new instance of an object. So we just need to write var or val depending on the type of variable we want to generate, and the type can normally be inferred. Variables are declared using val or var, provided they are immutable or mutableĪn interesting thing from Kotlin is that most of the time you won’t need to specify the type of the objects you are working with, as long as the compiler can infer it. The fact that most parts of our program are immutable provides lots of benefits, such as a more predictable behaviour and thread safety. This can also be done in Java (marking variables as final if we don’t want it to be modified), but in Kotlin it is much less verbose and much more used: In Kotlin immutable values are preferred whenever possible. The variables can be mutable and immutable Variables in Kotlin allow, as in Java, to assign values that can then be modified and used at different points in our program, as long as they are within the scope in which the code is executed.īut I’m going to focus on the differences we find with Java.
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