#runtime class

Every Java application has a single instance of class java.lang.Runtime to interact with java runtime environment(JRE) in which the application is running. This class provides a method to invoke GC, get total and free memory and execute a process, etc.

We can get application current runtime by getRuntime() method but we can’t create our own instance of Runtime.

Runtime runtime=Runtime.getRuntime()

Methods to invoke garbage collector explicitly

There are two ways to make a request to Java Virtual Machine in order to execute garbage collector explicitly:

Using System Class

This class support rich methods that deals with standard input and output, loading files and libraries and so on. It falls under Java.lang package. It also provides a method named gc() to request JVM to make an effort to run a garbage collector. Syntax:

System.gc();

Sin…

Execute a script using runtime class

I have been trying all day long to run a mysql script in java, First I started reading the script and executing updateQuery() and executeQuery() and nothing. I tried to use the runtime class like this:

Runtime rt = Runtime.getRuntime(); String[] whattodo = {"mysql -u root","use Taxis","//. C:/hola/database.sql"}; Process pr = rt.exec(whattodo);

it runs but when I try to run this code:

Stateme…