} else { System.out.println("您是未成年人。"); } 1. 2. 3. 4. 5. 6. 2.3 if-else if语句 当需要判断多个条件时,可以使用if-else if结构: if (condition1) { // 执行代码块1 } else if (condition2) { // 执行代码块2 } else { // 执行代码块3 } 1. 2. 3. 4. 5. 6. 7. ...
ageage}elseif(age<21){printf("You need to be over 21\n");}else{printf("You are over 18 and older than 21 so you can continue \n");}} Output Run the code and check its output − You need to be over 18 years old to continue ...
此外,try语句可能有一个finally子句,但不需要。 错误5:In order to define a keyboard input object, keyboard, you could use the instruction: BufferedReader keyboard = new BufferedReader(System.in); A.true B.false 错误解析:一个BufferedReader对象必须用Reader对象构建系统。System.in是一个输入流对象。为...
if-else结构 在Prolog中,if-else结构通常通过使用条件(clause)和否定(not)来实现。Prolog没有直接的if-else语句,但可以通过以下方式实现类似的功能: 代码语言:txt 复制 % 条件为真时的处理 condition_true(X) :- condition(X), !, true_action(X). % 条件为假时的处理 condition_false(X) :- \+ conditi...
if else 分支判断的很多情况都是进行非空条件的判断，Optional 是 Java8 开始提供的新特性，使用这个...
1、卫语句(Guard Clauses) 卫子句(Guard Clauses)是一种编程技巧,用于在函数或方法的执行过程中尽早地检查错误条件或异常情况,并在满足这些条件时立即退出函数。 卫子句是一种有效的代码设计模式,有助于编写更加健壮和易于理解的代码。 defdivide(a, b):ifb ==0:raiseValueError("Cannot divide by zero")return...
编写if 时不带 else,你的代码会更好! > If statements with fast return 如果不使用else,则我们将剩下干净的可读代码。...> Check preconditions with guard clauses 至此,我们确保仅在值落在预期范围内时才执行主逻辑。现在,IF也已被三元代替,因为不再需要在结尾处默认返回"未知"。...4 将If-Else转换为字...
We'll bring our rainy day example back and extend it to show two alerts — one when it is raining and one when it is not raining. In addition, we'll also change the dummy value of isRaining to false (previously it was true) so that we could test the else clause. Here's the cod...
这样子的其实还好(但不够优雅),有的业务代码更是嵌套了4层if else ,这样让人阅读起来很困难,看起来不够优雅。2.解决方案2.1 尽早返回又称卫语句,即Guard StatementWikiPedia: In computer programming, aguardis abooleanexpressionthat must evaluate to true if the program execution is to continue in the ...
if (condition) statement1; else statement2; The else clause is optional. Each statement may be a single statement or a compound statement enclosed in curly braces (a block). The condition is any expression that returns a boolean value.