求助：要怎么继承这个类
package test;
import java.util.*;
public class TestHashMap extends HashMap{
public static void main(String[] args) {
//HashMap<Integer, Integer> c = new HashMap<Integer, Integer>();
//TestHashMap c = new TestHashMap();
继承后的TestHashMap没有<Integer, Integer>,要怎么办才能让

继承的类有<Integer, Integer>

------解决方案--------------------
恩