Java优学网算术运算符讲解：从基础到实战，轻松掌握Java运算技巧

int a = 10 + 5; // 双目运算符 int b = -a; // 单目运算符

int sum = 15 + 8; // 结果是23 int difference = 20 - 7; // 结果是13

double originalPrice = 299.0; double discountRate = 0.15; double finalPrice = originalPrice * (1 - discountRate); System.out.println("折后价格：" + finalPrice);

int count = 10; count += 5; // 相当于 count = count + 5 count = 2; // 相当于 count = count 2