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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