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¾ÍÊÇÈçºÎ°Ñ  String cardId="D42BBF2300A300";
ת³É long l = 0XD42BBF2300A300l;

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Integer.parseInt(String str)Õâ¸öº¯ÊýÖªµÀÂð£¿
LongµÄ¶ÔÓ¦µÄ

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Exception in thread "main" java.lang.NumberFormatException: For input string: "D42BBF2300A300l"
        at java.lang.NumberFormatException.forInputString(NumberFormatException.java:48)
        at java.lang.Long.parseLong(Long.java:403)
        at java.lang.Long.parseLong(Long.java:461)
        at serialP.Main.main(Main.java:77)
Java Result: 1

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Java code:

public class ParseLong {

public static void main(String[] args) {

String cardId="D42BBF2300A300";
Long n = Long.parseLong(cardId, 16);
System.out.println(Long.toHexString(n));
}

}

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Java code:
public static void main(String[] argv){
String cardId="D42BBF2300A300";
Long l = Long.parseLong(cardId,16);
System.out.println(l);
System.out.println(Long.toString(l,16));
}

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