Mega Code Archive
Use a comparator to sort accounts by last name
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import java.util.Comparator;
import java.util.Map;
import java.util.Set;
import java.util.TreeMap;
class TComp implements Comparator<String> {
public int compare(String a, String b) {
int i, j, k;
String aStr, bStr;
aStr = a;
bStr = b;
i = aStr.lastIndexOf(' ');
j = bStr.lastIndexOf(' ');
k = aStr.substring(i).compareTo(bStr.substring(j));
if (k == 0) // last names match, check entire name
return aStr.compareTo(bStr);
else
return k;
}
}
class TreeMapDemo2 {
public static void main(String args[]) {
TreeMap<String, Double> tm = new TreeMap<String, Double>(new TComp());
tm.put("J D", new Double(3434.34));
tm.put("T S", new Double(123.22));
tm.put("J B", new Double(1378.00));
tm.put("T H", new Double(99.22));
tm.put("R S", new Double(-19.08));
Set<Map.Entry<String, Double>> set = tm.entrySet();
for (Map.Entry<String, Double> me : set) {
System.out.print(me.getKey() + ": ");
System.out.println(me.getValue());
}
System.out.println();
double balance = tm.get("A");
tm.put("A", balance + 1000);
System.out.println("A's new balance: " + tm.get("A"));
}
}
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