Java Switch 语句Java Switch 语句使用switch语句从多个要执行的代码块中选择一个执行。 语法 switch(expression) { case x: // 代码块 break; case y: // 代码块 break; default: // 代码块 } 工作原理:switch 表达式计算一次 case 将表达式的值与每种情况的值进行比较 如果存在匹配项,则执行关联的代码块...
例如：使用hashmap将字符存储为键，将数字存储为值。参考https://www.w3schools.com/java/java_hashmap...
switch(expression){casevalue1:// code to be executed if expression equals value1;break;casevalue2:// code to be executed if expression equals value2;break;// you can have any number of case statements.default:// code to be executed if expression doesn't match any cases;} Java Copy The...
When Java reaches abreakkeyword, it breaks out of the switch block. This will stop the execution of more code and case testing inside the block. When a match is found, and the job is done, it's time for a break. There is no need for more testing. ...
The switch statement evaluates an expression. The value of the expression is then compared with the values of each case in the structure. If there is a match, the associated block of code is executed. The switch statement is often used together with a break or a default keyword (or both)...
switch day { case 1: fmt.Println("Monday") case 2: fmt.Println("Tuesday") case 3: fmt.Println("Wednesday") case 4: fmt.Println("Thursday") case 5: fmt.Println("Friday") case 6: fmt.Println("Saturday") case 7: fmt.Println("Sunday") } } 结果: Thursday 亲自试一试 » default...
Theswitchstatement in Go is similar to the ones in C, C++, Java, JavaScript, and PHP. The difference is that it only runs the matched case so it does not need abreakstatement. Single-Case switch Syntax Syntax switchexpression{ casex: ...
❮ PHP Keywords ExampleGet your own PHP Server Choose a message to display based on the value of a variable: <?php $favcolor ="red"; switch($favcolor) { case"red": echo"Your favorite color is red!"; break; case"blue":
Warning:If you omit thebreakstatement in a case that is not the last, and that case gets a match, the next case will also be executed even if the evaluation does not match the case! Example What happens if we remove thebreakstatement from case "red"?
case3: day ="Wednesday"; break; case4: day ="Thursday"; break; case5: day ="Friday"; break; case6: day ="Saturday"; } The result of day will be: Tuesday Try it Yourself » The break Keyword When JavaScript reaches abreakkeyword, it breaks out of the switch block. ...