java 范型

import java.util.*;

public class Basic {
public static void main(String[] args) {

List<String> c = new ArrayList<String>();
c.add("one");
c.add("two");
for (int i = 0; i < c.size(); i ++) {
String s = c.get(i);
System.out.println(s);
}

Collection<String> c2 = new HashSet<String>();
c2.add("a");
c2.add("b");

for (Iterator<String> it = c2.iterator(); it.hasNext(); ) {
String s = it.next();
System.out.println(s);
}
}
}

class name implements Comparable<name> {
int age;
public int compareTo(name n) {
if (this.age > n.age ) {
return 1;
}else if (this.age < n.age) {
return -1;
}else {
return 0;
}
}
}