Runtime class in Java | Lecture 9 | Step by Step java tutorial
Java Tutorial For Beginners 9(Step by Step tutorial) | Runtime class in Java | Lecture 9
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Lecture 9:
Java Runtime class is used to interact with java runtime environment. Java Runtime class provides methods to execute a process, invoke GC, get total and free memory etc.
1. open notepad
Runtime.getRuntime().exec("notepad");//will open a new notepad
2. add shutdown hook
public static void main(String[] args) {
System.out.println("Start");
Runtime.getRuntime().addShutdownHook(new Thread(){
public void run(){
System.out.println("End");
}
});
System.out.println("Mid");
}
3. availableProcessors
Runtime.getRuntime().availableProcessors()
4. freeMemory() and totalMemory() method
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