jerntat
asked on
Is there a memory leak
Hello, if I a code that goes something like this:
import javax.swing.JOptionPane;
import java.io.*;
import java.util.*;
public class garbage
{
private static Runtime checkMem;
public static void main ( String args[] )
{
checkMem = checkMem.getRuntime();
try
{
Hashtable test = new Hashtable(2);
for(int i=0; i< 30000; i++)
{
Car b = new Car(123);
Integer temp = new Integer(i);
String dumb = temp.toString();
test.put(dumb, b);
}
test.clear();
}
catch(Exception ex)
{
System.out.println(ex.toSt
}
}//ends main
Car is just a class I have constructed. I created Hashtable test to store objects of Car.
Will there be a memory leak if i just clear the content of the hashtable test using the clear() method?
import javax.swing.JOptionPane;
import java.io.*;
import java.util.*;
public class garbage
{
private static Runtime checkMem;
public static void main ( String args[] )
{
checkMem = checkMem.getRuntime();
try
{
Hashtable test = new Hashtable(2);
for(int i=0; i< 30000; i++)
{
Car b = new Car(123);
Integer temp = new Integer(i);
String dumb = temp.toString();
test.put(dumb, b);
}
test.clear();
}
catch(Exception ex)
{
System.out.println(ex.toSt
}
}//ends main
Car is just a class I have constructed. I created Hashtable test to store objects of Car.
Will there be a memory leak if i just clear the content of the hashtable test using the clear() method?
Mick Barry
Shouldn't be.
ASKER
so the next gc should remove the Hastable object and the whole list of Car objects store in the Hashtable?
I don't think there is a guarantee of that.
Certainly if the jvm was short of memory then the memory used by the Car objects will be freed, but the Hastable object itself will remain as there is still reference to it.
Certainly if the jvm was short of memory then the memory used by the Car objects will be freed, but the Hastable object itself will remain as there is still reference to it.
The Car objects -and Integer objects and Strings- can all be collected by (any decent) gc.
So you don't have a leak.
So you don't have a leak.
ASKER
What is i just set the Hashtable test to null :
test = null;
will everything including the objects store in the hashtable and the hashtable itself be gc?
test = null;
will everything including the objects store in the hashtable and the hashtable itself be gc?
ASKER CERTIFIED SOLUTION
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