Java 教程是为 JDK 8 编写的。本页中描述的示例和实践未利用在后续版本中引入的改进。
arrayOfInts[j] > arrayOfInts[j+1]
int i = 10; int n = i++%5;
i
和 n
的值是多少?i++
),而是使用前缀版本(++i
),i
和 n
的最终值是多少?boolean
的值,你将使用哪个运算符?=
或 ==
?result = someCondition ?value1 : value2;
class ArithmeticDemo { public static void main (String[] args){ int result = 1 + 2; // result is now 3 System.out.println(result); result = result - 1; // result is now 2 System.out.println(result); result = result * 2; // result is now 4 System.out.println(result); result = result / 2; // result is now 2 System.out.println(result); result = result + 8; // result is now 10 result = result % 7; // result is now 3 System.out.println(result); } }
class PrePostDemo { public static void main(String[] args){ int i = 3; i++; System.out.println(i); // "4" ++i; System.out.println(i); // "5" System.out.println(++i); // "6" System.out.println(i++); // "6" System.out.println(i); // "7" } }