Constants in java

//The class defining constants:
package com.mypackage;//the class "Constants" is in the package "com.mypackage"
public final class Constants {
    public static final int CONSTANT_A = 25;
    public static final String CONSTANT_B = "This is a public static final String";
}


//Another class that use these constants (in a separate file in the same package):
package com.mypackage;//the class "MyClass" is in the package "com.mypackage"
import Constants.CONSTANT_A;//we import the value "Constants.CONSTANT_A" to use it more easily
public class MyClass {
    public void exampleofConstantsUse() {
      System.out.println(Constants.CONSTANT_B);//need to specify the constants class name because there is no import
      System.out.println(CONSTANT_A);//don't need to specify the constants class name because of the static import
    }
}

//Another class that use these constants (in a separate file in a DIFFERENT package):
package com.package2;//This class is in another package
//Instead of writing "import com.mypackage.Constants.CONSTANT_A;" for each constant value, write:
import com.mypackage.Constants.*;
public class MyClass {
    public void example() {
        System.out.println(CONSTANT_A);//prints 25
        System.out.println(CONSTANT_B);//prints "This is a public static final String" (without the quotes)
    }
}