How to resolve the error : “MyClass.INSTANCE” is not a statement when I try to instantiate a singleton...
I have a Java Singleton class as :
public enum MyClass{
INSTANCE;
private MyClass(){
init();
}
private static void init(){
System.out.println("Singleton Class initiated");
}
}
When I try to instantiate the class by :
MyClass.INSTANCE;
I get an error that it is not a statement.
However, the following works, which is not ideal for production code:
System.out.println(MyClass.INSTANCE);
Is there a way to initiate the enum singleton class properly, without calling any other dummy API of the class?
java enums singleton instantiation
asked Nov 12 at 11:48
Aadhirai R
818
add a comment |
I have a Java Singleton class as :
public enum MyClass{
INSTANCE;
private MyClass(){
init();
}
private static void init(){
System.out.println("Singleton Class initiated");
}
}
When I try to instantiate the class by :
MyClass.INSTANCE;
I get an error that it is not a statement.
However, the following works, which is not ideal for production code:
System.out.println(MyClass.INSTANCE);
Is there a way to initiate the enum singleton class properly, without calling any other dummy API of the class?
java enums singleton instantiation
asked Nov 12 at 11:48
Aadhirai R
818
1
MyClass instance = MyClass.INSTANCE;
– Lorelorelore
Nov 12 at 11:51
1
Thank you! Please add it as an answer and I will accept it.
– Aadhirai R
Nov 12 at 11:55
1
Just to clarify: you want some code that doesn't actually do anything with your class yet, but that ensures that the class is actually initialized, right?
– Joachim Sauer
Nov 12 at 12:03
@JoachimSauer : That's right.
– Aadhirai R
Nov 12 at 12:05
add a comment |
I have a Java Singleton class as :
public enum MyClass{
INSTANCE;
private MyClass(){
init();
}
private static void init(){
System.out.println("Singleton Class initiated");
}
}
When I try to instantiate the class by :
MyClass.INSTANCE;
I get an error that it is not a statement.
However, the following works, which is not ideal for production code:
System.out.println(MyClass.INSTANCE);
Is there a way to initiate the enum singleton class properly, without calling any other dummy API of the class?
java enums singleton instantiation
asked Nov 12 at 11:48
Aadhirai R
818
I have a Java Singleton class as :
public enum MyClass{
INSTANCE;
private MyClass(){
init();
}
private static void init(){
System.out.println("Singleton Class initiated");
}
}
When I try to instantiate the class by :
MyClass.INSTANCE;
I get an error that it is not a statement.
However, the following works, which is not ideal for production code:
System.out.println(MyClass.INSTANCE);
Is there a way to initiate the enum singleton class properly, without calling any other dummy API of the class?
java enums singleton instantiation
java enums singleton instantiation
asked Nov 12 at 11:48
Aadhirai R
818
asked Nov 12 at 11:48
Aadhirai R
818
asked Nov 12 at 11:48
Aadhirai R
818
asked Nov 12 at 11:48
Aadhirai R
818
asked Nov 12 at 11:48
Aadhirai R
818
818
1
MyClass instance = MyClass.INSTANCE;
– Lorelorelore
Nov 12 at 11:51
1
Thank you! Please add it as an answer and I will accept it.
– Aadhirai R
Nov 12 at 11:55
1
Just to clarify: you want some code that doesn't actually do anything with your class yet, but that ensures that the class is actually initialized, right?
– Joachim Sauer
Nov 12 at 12:03
@JoachimSauer : That's right.
– Aadhirai R
Nov 12 at 12:05
add a comment |
1
MyClass instance = MyClass.INSTANCE;
– Lorelorelore
Nov 12 at 11:51
1
Thank you! Please add it as an answer and I will accept it.
– Aadhirai R
Nov 12 at 11:55
1
Just to clarify: you want some code that doesn't actually do anything with your class yet, but that ensures that the class is actually initialized, right?
– Joachim Sauer
Nov 12 at 12:03
@JoachimSauer : That's right.
– Aadhirai R
Nov 12 at 12:05
1
1
MyClass instance = MyClass.INSTANCE;– Lorelorelore
Nov 12 at 11:51
MyClass instance = MyClass.INSTANCE;– Lorelorelore
Nov 12 at 11:51
1
1
Thank you! Please add it as an answer and I will accept it.
– Aadhirai R
Nov 12 at 11:55
Thank you! Please add it as an answer and I will accept it.
– Aadhirai R
Nov 12 at 11:55
1
1
Just to clarify: you want some code that doesn't actually do anything with your class yet, but that ensures that the class is actually initialized, right?
– Joachim Sauer
Nov 12 at 12:03
Just to clarify: you want some code that doesn't actually do anything with your class yet, but that ensures that the class is actually initialized, right?
– Joachim Sauer
Nov 12 at 12:03
@JoachimSauer : That's right.
– Aadhirai R
Nov 12 at 12:05
@JoachimSauer : That's right.
– Aadhirai R
Nov 12 at 12:05
add a comment |
2 Answers
2
active
oldest
votes
As I said in my comment: simply declare it in this way:
MyClass instance = MyClass.INSTANCE;
answered Nov 12 at 13:16
Lorelorelore
1,79961124
add a comment |
Just state class ( or enum in your case) isn't a valid Java statement.
You can create an object as @Lorelorelore suggested
MyClass instance = MyClass.INSTANCE;
Or if you want to call init() maybe change its signature
public void init(){
System.out.println("Singleton Class initiated");
}
And call the method directly:
MyClass.INSTANCE.init();
answered Nov 12 at 11:55
user7294900
20.3k103258
add a comment |
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2 Answers
2
active
oldest
votes
2 Answers
2
active
oldest
votes
active
oldest
votes
active
oldest
votes
As I said in my comment: simply declare it in this way:
MyClass instance = MyClass.INSTANCE;
answered Nov 12 at 13:16
Lorelorelore
1,79961124
add a comment |
As I said in my comment: simply declare it in this way:
MyClass instance = MyClass.INSTANCE;
answered Nov 12 at 13:16
Lorelorelore
1,79961124
add a comment |
As I said in my comment: simply declare it in this way:
MyClass instance = MyClass.INSTANCE;
answered Nov 12 at 13:16
Lorelorelore
1,79961124
As I said in my comment: simply declare it in this way:
MyClass instance = MyClass.INSTANCE;
answered Nov 12 at 13:16
Lorelorelore
1,79961124
answered Nov 12 at 13:16
Lorelorelore
1,79961124
answered Nov 12 at 13:16
Lorelorelore
1,79961124
answered Nov 12 at 13:16
Lorelorelore
1,79961124
1,79961124
add a comment |
add a comment |
Just state class ( or enum in your case) isn't a valid Java statement.
You can create an object as @Lorelorelore suggested
MyClass instance = MyClass.INSTANCE;
Or if you want to call init() maybe change its signature
public void init(){
System.out.println("Singleton Class initiated");
}
And call the method directly:
MyClass.INSTANCE.init();
answered Nov 12 at 11:55
user7294900
20.3k103258
add a comment |
Just state class ( or enum in your case) isn't a valid Java statement.
You can create an object as @Lorelorelore suggested
MyClass instance = MyClass.INSTANCE;
Or if you want to call init() maybe change its signature
public void init(){
System.out.println("Singleton Class initiated");
}
And call the method directly:
MyClass.INSTANCE.init();
answered Nov 12 at 11:55
user7294900
20.3k103258
add a comment |
Just state class ( or enum in your case) isn't a valid Java statement.
You can create an object as @Lorelorelore suggested
MyClass instance = MyClass.INSTANCE;
Or if you want to call init() maybe change its signature
public void init(){
System.out.println("Singleton Class initiated");
}
And call the method directly:
MyClass.INSTANCE.init();
answered Nov 12 at 11:55
user7294900
20.3k103258
Just state class ( or enum in your case) isn't a valid Java statement.
You can create an object as @Lorelorelore suggested
MyClass instance = MyClass.INSTANCE;
Or if you want to call init() maybe change its signature
public void init(){
System.out.println("Singleton Class initiated");
}
And call the method directly:
MyClass.INSTANCE.init();
answered Nov 12 at 11:55
user7294900
20.3k103258
edited Nov 12 at 14:54
answered Nov 12 at 11:55
user7294900
20.3k103258
answered Nov 12 at 11:55
user7294900
20.3k103258
answered Nov 12 at 11:55
user7294900
20.3k103258
20.3k103258
add a comment |
add a comment |
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1
MyClass instance = MyClass.INSTANCE;– Lorelorelore
Nov 12 at 11:51
1
Thank you! Please add it as an answer and I will accept it.
– Aadhirai R
Nov 12 at 11:55
1
Just to clarify: you want some code that doesn't actually do anything with your class yet, but that ensures that the class is actually initialized, right?
– Joachim Sauer
Nov 12 at 12:03
@JoachimSauer : That's right.
– Aadhirai R
Nov 12 at 12:05