在switch case中,break语句是可选的,但几乎每次处理switch case时都会使用它。 在我们讨论break语句之前,让我们看看下面的例子,我没有使用break语句: public class SwitchCaseExample2 { public static void main(String args[]){ int i=2; switch(i) { case 1: System.out.println("Case1 "); case 2: S...
publicclassSwitchCaseExample1{publicstaticvoidmain(Stringargs[]){intnum=2;switch(num+2){case1:System.out.println("Case1: Value is: "+num);case2:System.out.println("Case2: Value is: "+num);case3:System.out.println("Case3: Value is: "+num);default:System.out.println("Default: Value...
如果没有相匹配的case语句,也没有default语句,则什么也不执行。 在case语句序列中的break语句将引起程序流从整个switch语句退出。当遇到一个break语句时,程序将从整个switch语句后的第一行代码开始继续执行。这有一种“跳出” switch语句的效果。 下面是一个使用switch语句的简单例子: // A simple example of the ...
When using a switch expression in Java 14, you don’t have to use thebreakkeyword to break out of the switch statement or usereturnkeyword on each switch case to return a value; instead, you can return the entire switch expression. This enhanced switch expression makes the overall code look...
有了密封类再配合前面提到的 switch 模式匹配,就很好用了: 代码语言:javascript 代码运行次数:0 运行 AI代码解释 Root r=newRoot.A();varx=switch(r){caseRoot.Aa->1;caseRoot.Bb->2;caseRoot.Cc->3;}; 对密封接口的支持也是类似的。 密封类实际上也是一个很有用的特性,我之前在介绍 Kotlin 的密封类...
and a Java file using this hierarchy with a pattern matched switch packageexample;importexample.model.SealedInterface;importexample.model.TypeA;importexample.model.TypeB;publicclassMain{publicvoidapply(SealedInterfacesealedInterface) {switch(sealedInterface) {caseTypeAa->System.out.println("A!");caseTyp...
In the following code, the switch statement has repetitive break and assignment statements in case labels, which adds noise to the code. The default fall-through in switch branches can sneak in a logical error. For example, if we delete the break statement for case labelSTRAW, it results in...
return switch (o) { case Integer i -> String.format("int %d", i); case Long l -> String.format("long %d", l); case Double d -> String.format("double %f", d); case String s -> String.format("String %s", s); default -> o.toString(); ...
switch synchronized this throw throws transient try void volatile whilebyte abstractassertbooleanbreakbyte case catch char class const continue default do double else enum extends final finally float for goto if implements import instanceof int interface long native new package private protected public ret...
typeTester(Object obj) { switch (obj) { // null 匹配 case null -> System.o...