上述代码生成的字节码如下：public static int getSeasonNumber4(java.lang.String); descriptor: (...
We can’t compare all the types of objects and primitives in theswitchstatement.Aswitchworks only with four primitives and their wrappers as well as with theenum typeand theStringclass: byteandByte shortandShort intandInteger charandCharacter enum String Stringtype is available in theswitchstatement...
Java 12 introduced the switch expressions which can compute the value for the whole switch statement and assign its value to a variable. It is very similar to other normal Java statements. 2.1. Return value with Arrow Syntax Let us rewrite the last example, with a switch expression. Noticelin...
class Main { public static void main(String[] args) { int expression = 2; // switch statement to check size switch (expression) { case 1: System.out.println("Case 1"); // matching case case 2: System.out.println("Case 2"); case 3: System.out.println("Case 3"); default: Syste...
T我是str.length()，不是str.length。String有一个方法length()，而不是字段length。
This is not possible with Strings and thus is a drawback of the proposal; however, Case 2 can always be used in place of Case 1. This drawback is not important enough to make the String switch statement undesirable.Case 2: The hash-lookup switch statement...
Java Copy In this example, the switch statement checks the value of the stringday. Depending on the value, it prints a different message. This is a powerful feature that can greatly simplify your code when dealing with string conditions. ...
switch语句和if-else语句不同,switch语句可以有多个可能的执行路径。在第四版java编程思想介绍switch语句的语法格式时写到: switch(integral-selector) {caseintegral-value1: statement;break;caseintegral-value12: statement;break;default: statement; }
Java Switch Statements Instead of writingmanyif..elsestatements, you can use theswitchstatement. Theswitchstatement selects one of many code blocks to be executed: SyntaxGet your own Java Server switch(expression){casex:// code blockbreak;casey:// code blockbreak;default:// code block}...
Java 12 introduced the switch expressions which can compute the value for the whole switch statement and assign its value to a variable. It is very similar to other normal Java statements. 2.1. Return value with Arrow Syntax Let us rewrite the last example, with a switch expression. Noticelin...