What is <-- in Java? [duplicate]

Question

I came across below snippet. It outputs to 4 3 2 1

I never came across <-- in Java.

Is <-- an operator that makes the value of var1 to var2?

public class Test {      public static void main(String[] args) {          int var1 = 5, var2 = 0;         while (var2 <-- var1) {             System.out.print(" " + var1);         }     } } 

Answer 1

<-- is not a new Java operator (even though it may look like it), but there are 2 normal operators: < and --

while (var2 <-- var1) is the same as while(var2 < (--var1)), which can be translated to plain english as:

1. decrement the var1 variable ( --var is a prefix decrementation, ie. decrement the variable before condition validation)
2. Validate the condition var2 < var1

Answer 2

<-- There is no such operator in java.

It is var2 < (--var1) A relational + decrement operator.