Runtime class and its common methods

Each Java application has a Runtime class instance that enables the application to connect to the environment in which it is running. The current runtime can be obtained by means of a getRuntime method.

Common methods:

1, public static Runtime getruntime()

Returns the run-time object associated with the current Java application. Runtimemost methods of a class are instance methods, and they must be called according to the current run-time object.

2. Process  exec(String command)
Executes the specified string command in a separate process.

3. long freeMemory()
Returns the amount of idle memory in a Java virtual machine.

4. long maxMemory()
Returns the maximum amount of memory that the Java virtual machine is attempting to use.

5. long totalMemory()
Returns the total amount of memory in the Java virtual machine.

1  Public classRuntimetest {2      Public Static voidMain (string[] args)throwsIOException, interruptedexception{3Runtime runtime = Runtime.getruntime ();//get run-time object4         //executes the specified string command in a separate process. 5Process Procee = runtime.exec ("C:\\windows\\notepad.exe");6Thread.Sleep (3000);7 Procee.destroy ();8         //memory size, in bytes9SYSTEM.OUT.PRINTLN ("The amount of idle memory in the Java Virtual machine. "+runtime.freememory ());TenSYSTEM.OUT.PRINTLN ("Maximum amount of memory that the Java virtual machine is trying to use:" +runtime.maxmemory ()); OneSystem.out.println ("Returns the total amount of memory in the Java virtual machine:" +runtime.totalmemory ()); A     } -}

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Runtime class and its common methods