一种使用RTTI的好方案
import java.util.*;// Generic TypeMap works in any situation:
class TypeMap {
private Hashtable t = new Hashtable();
public void add(Object o) {
Class type = o.getClass();
if(t.containsKey(type))
((Vector)t.get(type)).addElement(o);
else {
Vector v = new Vector();
v.addElement(o);
t.put(type,v);
}
}
public Vector get(Class type) {
return (Vector)t.get(type);
}
public Enumeration keys() { return t.keys(); }
// Returns handle to adapter class to allow
// callbacks from ParseTrash.fillBin():
public Fillable filler() {
// Anonymous inner class:
return new Fillable() {
public void addTrash(Trash t) { add(t); }
};
}
}
public class DynaTrash {
public static void main(String[] args) {
TypeMap bin = new TypeMap();
ParseTrash.fillBin("Trash.dat",bin.filler());
Enumeration keys = bin.keys();
while(keys.hasMoreElements())
Trash.sumValue(
bin.get((Class)keys.nextElement()));
}
}
import java.util.*;
// Generic TypeMap works in any situation:
class TypeMap {
private Hashtable t = new Hashtable();
public void add(Object o) {
Class type = o.getClass();
if(t.containsKey(type))
((Vector)t.get(type)).addElement(o);
else {
Vector v = new Vector();
v.addElement(o);
t.put(type,v);
}
}
public Vector get(Class type) {
return (Vector)t.get(type);
}
public Enumeration keys() { return t.keys(); }
// Returns handle to adapter class to allow
// callbacks from ParseTrash.fillBin():
public Fillable filler() {
// Anonymous inner class:
return new Fillable() {
public void addTrash(Trash t) { add(t); }
};
}
}
public class DynaTrash {
public static void main(String[] args) {
TypeMap bin = new TypeMap();
ParseTrash.fillBin("Trash.dat",bin.filler());
Enumeration keys = bin.keys();
while(keys.hasMoreElements())
Trash.sumValue(
bin.get((Class)keys.nextElement()));
}
} 上一页
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