Java
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Effective
- 1 Basics 9
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Classes S
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Objects S
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Arrays S
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- 2 OOP 9
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Inheritance
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Polymorphism
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Static S
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Abstract
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Interfaces
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Constructors S
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Packages
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Final
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Sleep
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- 6 Design Patterns 4
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Singleton
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Observer
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Mediator
- 7 Swing 12
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Frame
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Panel
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Listener
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Menu
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Table
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Layout
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- 8 I/O 7
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Streams IO
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Socket
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Mail
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Logger
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- 9 Effective 7
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Constructors S
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Dependency Injection
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Composition
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Interfaces Default
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Import Static S
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- 10 Junit 5
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About Junit S
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S
R
Q
Java Effective Import Static
Import static, to avoid qualifying Potential negative impact on readabilty import static java.lang.Math.PI assertEquals(PI == Math.PI, true)Static
Math
p107 Sometimes the constants from a utilitiy class are used heavely.
/**
* Import static, to avoid qualifying with the class name
*
* Dumping potentialy large classes into your namespace,
* might have a negative impact on readabilty and testability.
* Use it with care!
*
* "Use static imports if you find yourself
* heavily using constants from a utility class" (Effective Java)
*/
package com.minte9.effective.import_static;
import static org.junit.Assert.assertEquals;
import static java.lang.Math.PI; // Look Here
import static java.lang.Math.*;
public class Math_Utility {
public static void main(String[] args) {
assertEquals(PI == Math.PI, true);
assertEquals(PI == java.lang.Math.PI, true);
assertEquals(round(42.2) == Math.round(42.2), true);
System.out.println("Tests passed");
}
}
➥ Questions