I would like to know what tool can be used to view code after type erasure. For example, I’d like to see what the following code looks like after type erasure. I know that generic type information is stripped prior to final compilation, replacing type references with Object or boundary types, creating bridge methods, etc. I want to see the source code after the erasure process takes place.
public static void main(String[] args) { Predicate<Object> objPredicate = (Object c) -> c.toString().length() > 2 ; Predicate<? super Integer> predicate = objPredicate; Number n = Integer.valueOf(22); System.out.println(predicate.test(n)); //this line does not compile }
[If compiling code is required to see an erasure inspection tool work on the example, the non-compiling line can be omitted or n
can be cast to Integer
]
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Answer
On github, I found the java-based open source gui tool bytecode viewer which did the job as follows:
public static void main(String[] var0) { Predicate var1 = (var0x) -> { return var0x.toString().length() > 2; }; Integer var3 = 22; System.out.println(var1.test(var3)); }
To get this, I set the view menu to Pane 2/Fernflower/Java.