JAVA EXAMPLE PROGRAMS

JAVA EXAMPLE PROGRAMS

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Program: How to copy ArrayList to array?


Description:

Here we can see example for copying all content of ArrayList to an array. You can get this done by calling toArray() method.


Code:
package com.java2novice.arraylist;

import java.util.ArrayList;

public class MyArrayListArray {

	public static void main(String a[]){
		ArrayList<String> arrl = new ArrayList<String>();
		arrl.add("First");
		arrl.add("Second");
		arrl.add("Third");
		arrl.add("Random");
		System.out.println("Actual ArrayList:"+arrl);
		String[] strArr = new String[arrl.size()];
		arrl.toArray(strArr);
		System.out.println("Created Array content:");
		for(String str:strArr){
			System.out.println(str);
		}
	}
}

Output:
Actual ArrayList:[First, Second, Third, Random]
Created Array content:
First
Second
Third
Random
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List Of All ArrayList Sample Programs:

  1. Basic ArrayList Operations.
  2. How to read all elements in ArrayList by using iterator?
  3. How to copy or clone a ArrayList?
  4. How to add all elements of a list to ArrayList?
  5. How to delete all elements from my ArrayList?
  6. How to find does ArrayList contains all list elements or not?
  7. How to copy ArrayList to array?
  8. How to get sub list from ArrayList?
  9. How to sort ArrayList using Comparator?
  10. How to reverse ArrayList content?
  11. How to shuffle elements in ArrayList?
  12. How to swap two elements in a ArrayList?
  13. How to convert list to csv string format?
Knowledge Centre
What is fail-fast in java?
A fail-fast system is nothing but immediately report any failure that is likely to lead to failure. When a problem occurs, a fail-fast system fails immediately. In Java, we can find this behavior with iterators. Incase, you have called iterator on a collection object, and another thread tries to modify the collection object, then concurrent modification exception will be thrown. This is called fail-fast.
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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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