You also know way to iterate over a HashMap, filter or transform a HashMap. there is no non-nullable types, everything should behave as nullables in kotlin. Now you can create, initialize a HashMap, add, update and remove items from a HashMap. NotNull public Map getIndexNamesAndAliases(String.Kotlin compiler throws NullPointerException immediately if it found any. In this Kotlin tutorial, weâve learned some important points of HashMap. Kotlin null safety is a procedure to eliminate the risk of null reference from the code. The example show you way to initialize a HashMap using hashMapOf() function: var bzkMap: HashMap = hashMapOf("zero" to 0, "onek" to 1000, "twok" to 2000, "bezkoder" to 9999) If you want to create a new HashMap that allows null values and null keys, just use the question mark ? right after the types. Properties in Kotlin are not initialized by default. This way, you can treat the resulting Context as non-null without the need for safe-call operators or workarounds. We can create a new HashMap using constructor. Kotlin type system has distinguish two types of references that can hold null (nullable references) and those that can not (non-null references). FragmentrequireContext, for example, returns a non-null Context and throws an IllegalStateException if called when a Context would be null. We can add an entry with null value or null key to Kotlin HashMap Given the design of HashMap implementation in Java, you can have atmost one null vale as a key and multiple null values for one null key and multiple non null.The key-value pair coming later could be ordered first.
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