RFR: 8293432: Use diamond operator in java.management

[Andrey Turbanov]

On Mon, 5 Sep 2022 19:56:44 GMT, Andrey Turbanov <aturbanov at openjdk.org> wrote:

> The diamond operator was introduced in Java 7. We can take advantage of this language feature to make code easier to read.
> Tested on Linux release x64. `make test TEST="jdk/java/lang/management jdk/javax/management jdk/com/sun/jmx jdk/sun/management"`
> 
> Test summary
> ==============================
>    TEST                                              TOTAL  PASS  FAIL ERROR   
>    jtreg:test/jdk/java/lang/management                  69    69     0     0   
>    jtreg:test/jdk/javax/management                     246   246     0     0   
>    jtreg:test/jdk/com/sun/jmx                            3     3     0     0   
>>> jtreg:test/jdk/sun/management                        33    32     0     1 <<
> 
> Single failure - is a test `RmiBootstrapTest.java#id1`. It's known issue - [JDK-8293335](https://bugs.openjdk.org/browse/JDK-8293335).

Thank you for review!

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PR: https://git.openjdk.org/jdk/pull/10173