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byte b1 = 10;
byte b2 = 20;
byte b3 = b1 + b2; //Óï·¨´íÎó£¬ÀàÐͲ»Æ¥Åä
int n = b1 + b2; //»òÕß byte b3 = (byte)(b1 + b2);
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int n = -1;
boolean b1 = (n >= 0) && (n < 10);
boolean b2 = (n >= 0) & (n < 10);
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