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¡¡¡¡String s = "I AM an Object!";
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¡¡¡¡public class Bill {//Ê¡ÂÔϸ½Ú}
¡¡¡¡public class PhoneBill extends Bill {//Ê¡ÂÔϸ½Ú}
¡¡¡¡public class GasBill extends Bill {//Ê¡ÂÔϸ½Ú}
¡¡¡¡ÔÚ´¦Àí³ÌÐòÀïÓÐÒ»¸ö·½·¨£¬½ÓÊÜÒ»¸öBillÀàÐ͵ĶÔÏ󣬼ÆËã½ð¶î¡£¼ÙÉèÁ½ÖÖÕ˵¥¼ÆËã·½·¨²»Í¬£¬¶ø´«ÈëµÄBill¶ÔÏó¿ÉÄÜÊÇÁ½ÖÖÖеÄÈκÎÒ»ÖÖ£¬ËùÒÔÒªÓÃinstanceofÀ´Åжϣº
¡¡¡¡public double calculate(Bill bill) {
¡¡¡¡if (bill instanceof PhoneBill) {
¡¡¡¡//¼ÆËãµç»°Õ˵¥
¡¡¡¡}
¡¡¡¡if (bill instanceof GasBill) {
¡¡¡¡//¼ÆËãȼÆøÕ˵¥
¡¡¡¡}
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¡¡¡¡public double calculate(PhoneBill bill) {
¡¡¡¡//¼ÆËãµç»°Õ˵¥
¡¡¡¡}
¡¡¡¡public double calculate(GasBill bill) {
¡¡¡¡//¼ÆËãȼÆøÕ˵¥
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