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JAVA EXAMPLE PROGRAMS

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Built-in Java Annotations: @Deprecated example


Description:

The @Deprecated annotation will be used to inform the compiler to generate a warning whenever a program uses a method, class, or field with the @Deprecated annotation. It is good to document the reason with Javadoc @deprecated tag. Make a note of case difference with @Deprecated and @deprecated. @deprecated is for documentation purpose.


Code:
package com.java2novice.annotations;

public class MyDeprecatedExmp {
	
	/**
     * @deprecated
     * reason for why it was deprecated
     */
	@Deprecated
	public void showDeprecatedMessage(){
		System.out.println("This method is marked as deprecated");
	}
	
	public static void main(String a[]){
		
		MyDeprecatedExmp mde = new MyDeprecatedExmp();
		mde.showDeprecatedMessage();
	}
}

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