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Java system operations
These options interact with the Java Virtual Machine and the underlying operating system. They include
- Query the total amount of system memory
- Query the amount of free memory
- Run the garbage collector
- Execute any pending finalization methods
- Get a string with the current date and time
- Query the value of a system property...
- Suspend the current thread for a specified number of milliseconds
- Exit the program with a termination code
- Execute an external command...
- Write text to the standard output...
- Write text to the standard error...
- Read text from the standard input
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