I want to use a class in Java for storing data which can be accessed for all other classes. Just like if it was a Mysql table.
This class should have only one instance, this way whenever its content is changed, all classes see the same content.
What is the best way to do it? I have read about the singleton pattern, but I don't know if it would be a design error to use it.
Create a singleton class with a data structure that meets your needs (Map, or List, or combo). Like so (example was just handcoded, dont know if it will compile):
public class FakeTable {
private Map vals = new HashMap();
private static final FakeTable INSTANCE = new FakeTable();
private FakeTable() {} // Private constructor
public static FakeTable getInstance() {
return INSTANCE;
}
public void setValue(String col, Object val) {
vals.put(col, val);
}
public Object getVal(String col) {
return vals.get(col);
}
}
Either have the data accessible as a static member or use a singleton. I would extend TableModel. TableModel is designed well already, and you can display your data easily in a JTable later if you wish.
