JAVA EXAMPLE PROGRAMS

JAVA EXAMPLE PROGRAMS

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Program: How to check if the date is after the specified date?


Code:
package com.java2novice.date;

import java.util.Date;

public class MyAfterDateTest {
	
	public static void main(String a[]){
		
		Date current = new Date();
		//create a date one day after current date
		long nextDay = System.currentTimeMillis() + 1000*60*60*24;
		//create date object
		Date next = new Date(nextDay);
		//compare both dates
		if(next.after(current)){
			System.out.println("The date is future day");
		} else {
			System.out.println("The date is older than current day");
		}
	}
}

Output:
The date is future day
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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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