Setting Launch Parameters In Java Class

问题

Is there a way to make it so you can set memory usage arguments inside a java class, not using eclipse or a java program compiler, just simple code that you can do inside a class using notepad or something. If you don't know what I mean, Here's an example:

public class Example {
   public Example() {
     -Xmx("1024M");
   }

   public static void main(String args[]) {
     new Example();
   }
}

Please help, thank you! Note: I don't want to make a cmd/batch file to run it with -Xmx!

回答1:

The memory cannot be changed at run-time (by the time the JRE gets to your code statement, the memory has been set & cannot be changed). The only way to achieve a different memory size is to relaunch the app. using a Process specifying larger memory (then close the original app. that does not have enough).

Of course, better to simply specify the required memory in the launch process (BAT file, JWS etc.).

来源：https://stackoverflow.com/questions/10936046/setting-launch-parameters-in-java-class