JavaScript if...else StatementIn computer programming, the if...else statement is a conditional statement that executes a block of code only when a specific condition is met. For example,Suppose we need to assign different grades to students based on their scores....
} else { block of code to be executed if the condition1 is false and condition2 is false }Example If time is less than 10:00, create a "Good morning" greeting, if not, but time is less than 20:00, create a "Good day" greeting, otherwise a "Good evening": if (time < 10) {...
}else{ //block of code to be executed if the condition1 is false and condition2 is false } Example If time is less than 10:00, create a "Good morning" greeting, if not, but time is less than 20:00, create a "Good day" greeting, otherwise a "Good evening": ...
从JDK 1.8 开始引入 Optional 类,在 JDK 9 时对 Optional 类进行了改进,增加了 ifPresentOrElse() 方法,我们可以借助它,来消除 if else 的判断,使用如下。 优化前代码: 代码语言:javascript 复制 String str="java";if(str==null){System.out.println("Null");}else{System.out.println(str);} 优化后代...
View the example in the browserJavaScript if...else if statementFor multiple conditions, we can use else if.Syntaxif (condition_1) statement_1 [else if (condition_2) statement_2] ... [else if (condition_n_1) statement_n_1] [else statement_n] ...
代码语言:javascript 复制 if(condition1&&condition2){// 当条件1和条件2都为真时执行的代码}else{// 当条件1或条件2为假时执行的代码} 判断字符串是否包含某个子串 代码语言:javascript 复制 if(str.indexOf('example')!==-1){// 当字符串包含子串'example'时执行的代码} ...
Example: Python if…else Statement number = int(input('Enter a number: '))ifnumber >0:print('Positive number')else:print('Not a positive number')print('This statement always executes') Run Code Sample Output 1 Enter a number: 10
JavaScript var isRaining = false; if (isRaining) { alert("Don't forget an umbrella!"); } else { alert("No need for an umbrella."); } Live Example The moment we run the code, we get the second alert, just as we expected. Also notice the body of else. Just like that of if,...
if-else 就是一个语句,可以是另一个语句的一部分,也可以是 if-else 的一部分,即嵌套。 求a,b,c三个数的最大数。 publicclassExample2 {publicstaticvoidmain(String[] args) {inta = 100;intb = 100;intc = 23;//分这几种情况:abc等大;a最大;b最大;c最大;ab等大并且最大;ac等大并且最大;bc...
[1]), - ]) - } else { - app.setAsDefaultProtocolClient(this.protocol) - } - } - - /** - * 从命令行参数中找到 url - * @param argv - */ - findUrl(argv: string[]): string | undefined { - const regExp = new RegExp(`^${this.protocol}://`) - return argv.find((str...