Compilation of switch statements uses the tableswitch and lookupswitch instructions. The tableswitch instruction is used when the cases of the switch can be efficiently represented as indices into a table of target offsets. The default target of the switch is used if the value of the expression of...
Where the cases of the switch are sparse, the table representation of the tableswitch instruction becomes inefficient in terms of space. The lookupswitch instruction may be used instead. The Java virtual machine specifies that the table of the lookupswitch instruction must be sorted by key so that ...
A unique characteristic of the switch statement in Java is the ‘fall through’ behavior. When a match is found in the case values, and there’s no break statement to terminate the current case, Java will execute all subsequent cases until it encounters a break statement or reaches the end ...
Javaswitch语句用于从多个条件执行一个语句。它就像if-else-if语句一样。 语法: switch(expression){casevalue1://code to be executed;break;//optionalcasevalue2://code to be executed;break;//optional...default:// code to be executed if all cases are not matched;} Java switch语句执行流程图如下...
从"20年前"的Java虚拟机规范里上找到Compile Switch这一节 里面是这样说的: Compilation of switch statements uses the tableswitch and lookupswitch instructions.The tableswitch instruction is used when the cases of the switch can be efficiently represented as indices into a table of target offsets. The...
break Statement in Java switch...case Notice that we have been using break in each case block. ... case 29: size = "Small"; break; ... The break statement is used to terminate the switch-case statement. If break is not used, all the cases after the matching case are also executed...
This example demonstrates fall-through by deliberately leaving out the break in one of the cases. Main.java </> Copy public class Main { public static void main(String[] args) { int day = 3; System.out.println("Using fall-through:"); switch (day) { case 1: System.out.println("...
Java 12 Erweiterungen: Ab Java 12 kannst du Switch-Ausdrücke verwenden, um Werte direkt aus Cases zurückzugeben, was die Syntax vereinfacht und die Lesbarkeit des Codes verbessert. enum Day { MONDAY, TUESDAY, WEDNESDAY, THURSDAY, FRIDAY, SATURDAY, SUNDAY } public class SwitchEnumExample {...
In this article, we discussed the subtleties of using theswitchstatement in Java. We can decide whether to useswitchbased on readability and the type of the compared values. The switch statement is a good candidate for cases when we have a limited number of options in a predefined set (e....
At the moment, in Java 12, the switch cases support only switching on enum, String, byte, short, char, int, and their wrapper classes. However, in the future there may well be more sophisticated forms and support for structural pattern matching on arbitrary “switchable” types. ...