Delete unused variable's memory in java

Question

I know that Java have its own garbage collection, but sometimes I want to delete the garbage manually. Is there any way to do the work like that? And considering that I have

Answer 1

A very common suggestion is to use System.gc() Which the JVM may choose to ignore. You can also use the scoping, for example:

import java.io.*;
public class AutoVariableTest
{
    public static void main(String[] args) throws Exception
    {
        String fileName = "test.txt";
        {// This is local block just to keep auto variable in check
            File file = new File(fileName); // file is not visible outside the scope and is available for garbage collection
            BufferedReader br = null;

            try{
                br = new BufferedReader(new FileReader(file));
                // ...
            }finally{
                if(br != null)
                    br.close();
            }
        }// local block end
    }
}