JAVA EXAMPLE PROGRAMS

JAVA EXAMPLE PROGRAMS

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What is Java Static Import?


Description:

In general, any class from same package can be called without importing it. Incase, if the class is not part of the same package, we need to provide the import statement to access the class. We can access any static fields or methods with reference to the class name. Here comes the use of static imports. Static imports allow us to import all static fields and methods into a class and you can access them without class name reference.

The syntax for static imports are given below:


Code:
package com.java2novice.staticimport;
// To access all static members of a class
import static package-name.class-name.*;
//To access specific static variable of a class
import static package-name.class-name.static-variable;
//To access specific static method of a class
import static package-name.class-name.static-method;

Static Import Example:

Here we have two classes. The class MyStaticMembClass has one static variable and one static method. And anther class MyStaticImportExmp imports these two static members.



MyStaticMembClass.java
package com.java2novice.stat.imp.pac1;

public class MyStaticMembClass {

	public static final int INCREMENT = 2;
	
	public static int incrementNumber(int number){
		return number+INCREMENT;
	}
}

MyStaticImportExmp.java
package com.java2novice.stat.imp.pac2;

import static com.java2novice.stat.imp.pac1.MyStaticMembClass.*;

public class MyStaticImportExmp {

	public static void main(String a[]){
		System.out.println("Increment value: "+INCREMENT);
		int count = 10;
		System.out.println("Increment count: "+incrementNumber(count));
		System.out.println("Increment count: "+incrementNumber(count));
	}
}

Output:
Increment value: 2
Increment count: 12
Increment count: 12
Knowledge Centre
When to use LinkedList or ArrayList?
Accessing elements are faster with ArrayList, because it is index based. But accessing is difficult with LinkedList. It is slow access. This is to access any element, you need to navigate through the elements one by one. But insertion and deletion is much faster with LinkedList, because if you know the node, just change the pointers before or after nodes. Insertion and deletion is slow with ArrayList, this is because, during these operations ArrayList need to adjust the indexes according to deletion or insetion if you are performing on middle indexes. Means, an ArrayList having 10 elements, if you are inserting at index 5, then you need to shift the indexes above 5 to one more.
Famous Quotations
Insanity: doing the same thing over and over again and expecting different results.
-- Albert Einstein

About Author

I'm Nataraja Gootooru, programmer by profession and passionate about technologies. All examples given here are as simple as possible to help beginners. The source code is compiled and tested in my dev environment.

If you come across any mistakes or bugs, please email me to [email protected].

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Reference: Java™ Platform Standard Ed. 7 - API Specification | Java™ Platform Standard Ed. 8 - API Specification | Java is registered trademark of Oracle.
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