Java – what is the difference between asinstanceof [x] and tox for value types?

My ability to use IntelliJ to convert java code into Scala code, which usually works well

It seems that IntelliJ replaces all transformations with asinstanceof

What are useful asinstanceof [int], asinstanceof [long] and so on for value types that cannot be replaced by toint, tolong?

resolvent

Solution

I didn't know there was such a situation You can compile the class to check whether the bytecode issued by yourself is the same

class Conv {
  def b(i: Int) = i.toByte
  def B(i: Int) = i.asInstanceOf[Byte]
  def s(i: Int) = i.toShort
  def S(i: Int) = i.asInstanceOf[Short]
  def f(i: Int) = i.toFloat 
  def F(i: Int) = i.asInstanceOf[Float]  
  def d(i: Int) = i.toDouble
  def D(i: Int) = i.asInstanceOf[Double]
}

And use javap - C conv to get

public byte b(int);
  Code:
   0:   iload_1
   1:   i2b
   2:   ireturn

public byte B(int);
  Code:
   0:   iload_1
   1:   i2b
   2:   ireturn

...

Here you can see that the exact bytecode is issued in each case

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