test68.java

SCJP认证考试资料

import java.util.*;
public class Test68 {
    public static void main(String[] args) {
	NumberNames nn = new NumberNames();
	nn.put("one",1);
	System.out.println(nn.getNames());
    }
}
class NumberNames {
    private HashMap<String,Integer> map =
	new HashMap<String,Integer>();
    public void put(String name,int value) {
	map.put(name,value);
    }
    public Set<String> getNames() {
	return map.keySet();
    }
}