如何释放类实例和内存？

Question

I am using JProfiler to troubleshoot my swing based desktop application for memory issues. In Memory view of JProfiler, I see 40K instances of a class and using 3MB of memory .

DefaultTableModel summaryModel = null;

void insertEnv(final Map<String, String> configMap,final String variable,final String value)
{
    this.configMap = configMap;

    Runnable runnable = new Runnable() 
    {
        public void run() 
        {               
            Vector dataVector  = summaryModel.getDataVector();

            for(int row = 0; dataVector != null && row < dataVector.size(); row++)
            {
                Vector rowData = (Vector)dataVector.get(row);
                if(rowData.get(0).toString().equals(variable))
                {
                    summaryModel.removeRow(row);
                }
            }

            Object[] row = new Object[] {variable, value };
            summaryModel.addRow(row);               
        }
    };

    SwingUtilities.invokeLater(runnable);
}

In insertEnv() function, I am adding new row in a JTable. This function is called 40K times and thus 40K instances of above class. What can be done to release the memory and instance count?

Answer 1

Are You sure properly close everything engine need to close?

You write "add from event new row to JTable" which seems to be bad pattern, but code use kind of model, can bee good.

JTable with very big data sets can/should be used in "virtual" mode. Look at google. 4MB of RAM usually isn't a problem, but collecting garbage 40k "pieces of objects" may be hard :(