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                >[success] # 邏輯運算符 * `&&` 表示邏輯與運算符,相當于"并且",同真為真,一假為假。 * `||` 表示邏輯或運算符,相當于"或者",一真為真,同假為假。 * `!` 表示邏輯非運算符,相當于"取反",真為假,假為真。 邏輯運算符的操作數均為boolean表達式 >[danger] ##### 邏輯運算符的短路特性 * `&&`對于邏輯與運算符來說,若第一個表達式為假則結果為假,此時跳過第二個表達式; * `||` 對于邏輯或運算符來說,若第一個表達式為真則結果為真,此時跳過第二個表達式; 案例說明,由于`++a == 1` 為false 所以后續的`a++ == 2` 不在執行 已經短路了,所以打印結果`2 2 false` ~~~ public class VarTest{ public static void main(String[] args){ int a = 1; int b = 2; boolean c = (++a == 1) && (a++ == 2); System.out.println(a + "," + b + "," + c); // 2 2 false } } ~~~ 案例說明,由于`++a == 2` 為true 產生了短路效應所以后面的 `a++ == 2`不在執行已經短路,因此打印結果為`2,2,true` ~~~ public class VarTest{ public static void main(String[] args){ int a = 1; int b = 2; boolean c = (++a == 2) || (a++ == 2); System.out.println(a + "," + b + "," + c); // 2 2 true } } ~~~ >[danger] ##### 判斷 條件 在java編程語言中 沒有`11>a>8` 這種寫法需要寫成`a>8 && a<11`
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