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I am trying to compile and I get this error: 

enigma/Rotor.java:30: incompatible types found : java.lang.String required: int switch(name){ 1 error

Why am I getting this error? How do I fix it? It's in the package and I can't seem to figure it out. Here's the code:

String label; Rotor(){;} Rotor(String name){ switch(name){ case "B": conversion_chart = B; break; case "C": conversion_chart = C; break; case "I": conversion_chart=I; notch = NOTCH[0]; break; case "II": conversion_chart=II; notch = NOTCH[1]; break; case "III": conversion_chart=III; notch = NOTCH[2]; break; case "IV": conversion_chart=IV; notch = NOTCH[3]; break; case "V": conversion_chart=V; notch = NOTCH[4]; break; case "VI": conversion_chart=VI; notch = NOTCH[5]; break; case "VII": notch = NOTCH[6]; conversion_chart=VII; break; case "VIII": notch = NOTCH[7]; conversion_chart=VIII; break; } label = name; position = 0; }
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6 Answers 6

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12 
switch(name)

switch statement with String is supported from Java7 onwards only.

I guess the compiler version you are using is less than Java7

Options:

  1. You need to either upgrade to Java7
  2. Change switch statement to if/else
  3. Use int in switch instead of String
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2 Comments

You need to upgrade your java to Java7
And if this still fails, it could be your IDE. For intelliJ, go to File > Project Structure > Project > Project Language Level and set to 7 and above
6

If you are using maven project then simply you can add following piece of code to ypur pom.xml and resolve your problem :

 <build> <plugins> <plugin> <groupId>org.apache.maven.plugins</groupId> <artifactId>maven-compiler-plugin</artifactId> <configuration> <source>1.8</source> <target>1.8</target> </configuration> </plugin> </plugins> </build>
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Looks like Maven stuck in medieval times. I had never ever thought that such obvious thing like standard java API should be enabled explicitly by adding some lines in maven pom file. It works tho, thanks!
4

switch accepts a String from java 7. prior to java 7 only int compatible types (short,byte,int, char) can be passed as switch arguments

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I'm really sorry about that. I have been trying to remove this downvote and it tells me I'm not allowed to change my vote. It was an accidental downvote, is there an undo?
@krico i have just edited my post, you can now revert your downvote .. :)
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If you're using maven then change build in pom as following else change JDK version as 1.8+

<plugin> <groupId>org.apache.maven.plugins</groupId> <artifactId>maven-compiler-plugin</artifactId> <configuration> <source>1.8</source> <target>1.8</target> </configuration> </plugin>
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0

You cannot switch over a String instance, only int (and byte/char/short, but not long/double), unless you have Java7+. Your best option now is to change to if else statements, like so:

if("B".equals(string)) { //handle string being "B" } else if("C".equals(string)) { //handle string being "C" } else ...

For more info on switching, see the Oracle tutorial. They mention the Java7 String functionality:

In Java SE 7 and later, you can use a String object in the switch statement's expression.

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@user1514362 What do you mean? I gave you an example which doesn't use a switch statement but perfoms the same thing. Isn't this what you want? You must remove your switch statement to make it work
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In Java, you can only do a switch on byte, char, short, or int, and not a String.

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Unless you are using Java 7 or newer - see other answers.

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