Mega Code Archive
Using Wildcard Arguments
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// Use a wildcard.
class GenericStats<T extends Number> {
T[] nums;
GenericStats(T[] o) {
nums = o;
}
double average() {
double sum = 0.0;
for(int i=0; i < nums.length; i++){
sum += nums[i].doubleValue();
}
return sum / nums.length;
}
boolean sameAvg(GenericStats<?> ob) {
if(average() == ob.average())
return true;
return false;
}
}
public class MainClass {
public static void main(String args[]) {
Integer inums[] = { 1, 2, 3, 4, 5 };
GenericStats<Integer> iob = new GenericStats<Integer>(inums);
double v = iob.average();
System.out.println("iob average is " + v);
Double dnums[] = { 1.1, 2.2, 3.3, 4.4, 5.5 };
GenericStats<Double> dob = new GenericStats<Double>(dnums);
double w = dob.average();
System.out.println("dob average is " + w);
Float fnums[] = { 1.0F, 2.0F, 3.0F, 4.0F, 5.0F };
GenericStats<Float> fob = new GenericStats<Float>(fnums);
double x = fob.average();
System.out.println("fob average is " + x);
System.out.print("Averages of iob and dob ");
if(iob.sameAvg(dob)){
System.out.println("are the same.");
}else{
System.out.println("differ.");
}
System.out.print("Averages of iob and fob ");
if(iob.sameAvg(fob)){
System.out.println("are the same.");
}else{
System.out.println("differ.");
}
}
}
iob average is 3.0
dob average is 3.3
fob average is 3.0
Averages of iob and dob differ.
Averages of iob and fob are the same.
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