How do you use Runtime in Java?

[匿名]

2017-12-14 5:15 pm

I'm trying to use Runtime.totalMemory() and Runtime.freeMemory() to see how much memory my program is using, but how would you use it contextually? I get that it's an instance method so I should use Runtime.getRuntime() but how do I use it after that? I've been on a long hiatus from coding so I'm a little out of practice.

回答 (1)

husoski

2017-12-14 9:50 pm

✔ 最佳答案

There just one Runtime object for a running Java application, and you can get a reference to that object with Runtime.getRuntime().

You can use this each time you want to refer to that object, with something like:
long total = Runtime.getRuntime().totalMemory();
long free = Runtime.getRuntime().freeMemory();

Another option is to call getRuntime() once and save the reference:
Runtime rt = Runtime.getRuntime();

...and then later use that reference:
long total = rt.totalMemory();
long free = rt.freeMemory();

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