Whether a variable is a constant variable or not may have implications with respect to class initialization (§12.4.1), binary compatibility (§13.1, §13.4.9) and definite assignment (§16).In your example, the Foo.BA* variables do not have initializers, and hence do not qualify as “constant variables”. Questions: //Number 1 int x = 2; while (x < 200) { System.out.println(x + " "); x *= x; Output: 3 //Number 2 String word = "a"; while (word.length() < 10) { word = "b" + word + "b"; } System.out... Java switch statement: Constant expression required, but it IS constant Refer to JLS 15.28 Constant Expressions for the gory details, and you will see that method calls are not allowed in constant expressions.
To clarify, an enum constant is not a constant expression as defined by the Java Language Speicification 3rd Edition. Get your technical queries answered by top developers ! Welcome to Intellipaat Community. Trying to add a case null: will generate the following compile time exception: case expressions must be constant expressions. Switching on a String. I understand that the compiler needs the expression to be known at compile time to compile a switch, but why isn’t Foo.BA_ constant? Consider the following valid code:I got this error on Android, and my solution was just to use: Questions: I am setting a textview as HTML retrieved from Firebase database. In my earlier Java enum examples tutorial, I demonstrated how to declare a simple Java enum, and then how to use an enum with a variety of Java constructs, including a Java switch statement, a for loop, and an if/then statement.. Questions: I am receiving ByteArrayResource as response from my RestTemplate response.
New in Java 7 is the ability for your programs to switch on a String: ... condition in the body of the switch.
In this enum tutorial, I want to just focus on … HTML / CSS; SAP; Tipps & Tricks; Switch/case bietet sich für übersichtliche Codes bei Mehrfachverzweigungen an. Java switch statement: Constant expression required, but it IS constant. I don't think there is any workaround, apart for a large-scale change to all of the switch statements.
This is because an enum constant is not really constant, but created during class initialization of the enum type. Java switch statement: Constant expression required, but it IS constant because you left the values off your constants. The response is a sheet file, how do I decode it and read it in springboot Java ? Try:
FULL PRODUCT VERSION : java version "1.5.0_05" Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0_05-b05) Java HotSpot(TM) Client VM (build 1.5.0_05-b05, mixed mode, sharing) ADDITIONAL OS VERSION INFORMATION : Microsoft Windows XP [Version 5.1.2600] A DESCRIPTION OF THE PROBLEM : javac fails to recognize some static final int constants as a valid constant expressions.
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When I am setting the question the I am adding another value called qid to the textview. SWITCH/CASE Java.
So, I am working on this class that has a few static constants:Then, I would like a way to get a relevant string based on the constant:I understand that the compiler needs the expression to be known at compile time to compile a switch, but why isn’t I understand that the compiler needs the expression to be known at compile time to compile a switch, but why isn’t Foo.BA_ constant?While they are constant from the perspective of any code that executes after the fields have been initialized, they are not a We call a variable, of primitive type or type String, that is final and initialized with a compile-time constant expression (§15.28) a constant variable. 1 view. Abhängig von einem vorgegebenen Ausdruck (hinter switch) verzweigt das Coding entweder zu einer passenden case-Sprungmarke oder zur default-Sprungmarke (wenn vorhanden). Wird eine case-Marke angesprungen, dann werden alle Anweisungen bis zum Ende des switch … Can I use an enum type in Java switch statement? Yes, you can. The fix is simple; change the Foo.BA* variable declarations to have initializers that are compile-time constant expressions.Because those are not compile time constants. Java Examples - Use of enum & switch statement - How to use enum & switch statement ? Java enum FAQ: Can you share a Java enum switch example, i.e., how to use an enum with a Java switch statement?. So, I am working on this class that has a few static constants:Then, I would like a way to get a relevant string based on the constant:However, when I compile, I get a constant expression required error on each of the 3 case labels.I understand that the compiler needs the expression to be known at compile time to compile a switch, but why isn't Foo.BA_ constant? Values.java:9: error: constant expression required case a: ^ Values.java:12: error: constant expression required case b: ^ Values.java:15: error: constant expression required case c: ^ 3 errors[/b] Compiler is treating a,b and c as variable but there you need a constant expression for the data type you provide in your switch label. But the output comes in 2 lines.