why kotlin designed code example

Example 1: Kotlin is like java

val apples = 3
val oranges = 5
val fruitSummary = "I have ${apples + oranges} " +
                   "pieces of fruit."

Example 2: Kotlin is like java

var myVariable = 42
myVariable = 50

val myConstant = 42

Example 3: Kotlin is like java

val explicitDouble: Double = 70.0

Example 4: Kotlin is like java

println("Hello, world!")