public static void main(String[] args) throws IOException {
Map<String,String> map = new HashMap<String,String>();
map.put("a", "aasdf");
map.put("3", "fffff");
map.put("2", "jljlj");
for(Entry<String, String> e : map.entrySet()){
System.out.println("key: "+ e.getKey()+" hashCode: "+ e.getKey().hashCode());
}} 输出：key: 3 hashCode: 51
key: 2 hashCode: 50
key: a hashCode: 97
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