Convert Collection into Array

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Contents

[edit] Overview - Convert Collection into Array

This Java example program shows how to convert Collection into Array.

[edit] Java Source Code

  • Package: example.array
  • File: PlanetSet.java 
package example.array;
 
import java.util.ArrayList;
import java.util.Collection;
 
public class PlanetSet {
    public static void main(String args[]) {
	String names[] = { "Mercury", "Venus", "Earth", "Mars", "Jupiter", "Saturn", "Uranus", "Neptune", "Pluto" };
	Collection planets = new ArrayList();
	for (int i = 0, n = names.length; i < n; i++) {
	    planets.add(names[i]);
	}
	String s[] = (String[]) planets.toArray(new String[0]);
	for (int i = 0, n = s.length; i < n; i++) {
 
	    System.out.println(s[i]);
	}
	planets.remove(names[3]);
	System.out.println(names[1] + " " + planets.contains(names[1]));
	System.out.println(names[3] + " " + planets.contains(names[3]));
    }
}

[edit] What Result You Can Get

Run the program, you will get: 

Mercury
Venus
Earth
Mars
Jupiter
Saturn
Uranus
Neptune
Pluto
Venus true
Mars false

[edit] Required External Libraries and/or Files for this Java Example

Need nothing.


[edit] How to Run this Java Example Program

We recommend running this Java example program with Eclipse.

For assistance in working with Eclipse, please see How to Run Java Program with Eclipse.

It's fairly easy.



[edit] Question & Answer

Any question?

Click edit and post your question or answer here.

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