When used like this:
import static com.showboy.Myclass;
public class Anotherclass{}
what's the difference between import static com.showboy.Myclass
and import com.showboy.Myclass
?
See Documentation
The static import declaration is analogous to the normal import declaration. Where the normal import declaration imports classes from packages, allowing them to be used without package qualification, the static import declaration imports static members from classes, allowing them to be used without class qualification. So when should you use static import? Very sparingly! Only use it when you'd otherwise be tempted to declare local copies of constants, or to abuse inheritance (the Constant Interface Antipattern). In other words, use it when you require frequent access to static members from one or two classes. If you overuse the static import feature, it can make your program unreadable and unmaintainable, polluting its namespace with all the static members you import. Readers of your code (including you, a few months after you wrote it) will not know which class a static member comes from. Importing all of the static members from a class can be particularly harmful to readability; if you need only one or two members, import them individually. Used appropriately, static import can make your program more readable, by removing the boilerplate of repetition of class names.
There is no difference between those two imports you state. You can, however, use the static import to allow unqualified access to static members of other classes. Where I used to have to do this:
import org.apache.commons.lang.StringUtils;
.
.
.
if (StringUtils.isBlank(aString)) {
.
.
.
I can do this:
import static org.apache.commons.lang.StringUtils.isBlank;
.
.
.
if (isBlank(aString)) {
.
.
.
You can see more in the documentation.
Static import is used to import static fields / method of a class instead of:
package test;
import org.example.Foo;
class A {
B b = Foo.B_INSTANCE;
}
You can write :
package test;
import static org.example.Foo.B_INSTANCE;
class A {
B b = B_INSTANCE;
}
It is useful if you are often used a constant from another class in your code and if the static import is not ambiguous.
Btw, in your example "import static org.example.Myclass;" won't work : import is for class, import static is for static members of a class.
The basic idea of static import is that whenever you are using a static class,a static variable or an enum,you can import them and save yourself from some typing.
I will elaborate my point with example.
import java.lang.Math;
class WithoutStaticImports {
public static void main(String [] args) {
System.out.println("round " + Math.round(1032.897));
System.out.println("min " + Math.min(60,102));
}
}
Same code, with static imports:
import static java.lang.System.out;
import static java.lang.Math.*;
class WithStaticImports {
public static void main(String [] args) {
out.println("round " + round(1032.897));
out.println("min " + min(60,102));
}
}
Note: static import can make your code confusing to read.
import static java.lang.Math
without the asterisk?
the difference between "import static com.showboy.Myclass" and "import com.showboy.Myclass"?
The first should generate a compiler error since the static import only works for importing fields or member types. (assuming MyClass is not an inner class or member from showboy)
I think you meant
import static com.showboy.MyClass.*;
which makes all static fields and members from MyClass available in the actual compilation unit without having to qualify them... as explained above
The import
allows the java programmer to access classes of a package without package qualification.
The static import
feature allows to access the static members of a class without the class qualification.
The import
provides accessibility to classes and interface whereas static import
provides accessibility to static members of the class.
Example :
With import
import java.lang.System.*;
class StaticImportExample{
public static void main(String args[]){
System.out.println("Hello");
System.out.println("Java");
}
}
With static import
import static java.lang.System.*;
class StaticImportExample{
public static void main(String args[]){
out.println("Hello");//Now no need of System.out
out.println("Java");
}
}
See also : What is static import in Java 5
Say you have static fields and methods inside a class called MyClass
inside a package called myPackage
and you want to access them directly by typing myStaticField
or myStaticMethod
without typing each time MyClass.myStaticField
or MyClass.myStaticMethod
.
Note : you need to do an import myPackage.MyClass
or myPackage.*
for accessing the other resources
The static
modifier after import
is for retrieving/using static fields of a class. One area in which I use import static
is for retrieving constants from a class. We can also apply import static
on static methods. Make sure to type import static
because static import
is wrong.
What is static import
in Java - JavaRevisited - A very good resource to know more about import static
.
Very good exaple. npt tipical with MAth in wwww....
https://www.java2novice.com/java-fundamentals/static-import/
public class MyStaticMembClass {
public static final int INCREMENT = 2;
public static int incrementNumber(int number){
return number+INCREMENT;
}
}
in onother file inlude
import static com.java2novice.stat.imp.pac1.MyStaticMembClass.*;
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