java runtime class
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java runtime class tutorial
the `runtime` class in java is a part of the `java.lang` package and provides an interface to the java runtime environment (jre). it allows you to interact with the java runtime, fetching system properties, executing system commands, and managing memory.
#### key features of the runtime class
1. **singleton instance**: the `runtime` class cannot be instantiated. instead, it provides a static method called `getruntime()` to obtain the singleton instance.
2. **memory management**: you can query the current memory usage and request garbage collection through methods like `totalmemory()`, `freememory()`, and `gc()`.
3. **executing external processes**: you can execute external applications or commands using the `exec()` method.
4. **system properties**: you can retrieve system properties such as the available processors and the version of the java runtime.
#### commonly used methods
`static runtime getruntime()`: returns the runtime object associated with the current java application.
`void gc()`: runs the garbage collector.
`long totalmemory()`: returns the total amount of memory in the java virtual machine.
`long freememory()`: returns the amount of free memory in the java virtual machine.
`process exec(string command)`: executes the specified string command in a separate process.
example of using the runtime class
here's an example that demonstrates how to use the `runtime` class to check memory usage, execute a system command, and invoke garbage collection.
explanation of the code
1. **memory usage**:
the code first gets the current used memory before allocating a large array.
it then allocates a large array and checks the memory usage again.
2. **garbage collection**:
the `gc()` method is called, which requests the jvm to run the garbage collector.
the memory usage is checked again after the garbage collection request.
3. **executing system command**:
the code exec ...
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