java.lang.ArrayStoreException

[Pramod P Deore]

Hi all I have ArrayList of type as <Double>. Now I want to convert this into String[]. But it throws java.lang.ArrayStoreException. As per docs

Thrown to indicate that an attempt has been made to store the wrong type of object into an array of objects.

But still not clear Here is my code

import java.util.*;

public class DateListToDateArray
{
	ArrayList <Double> latestVal = new ArrayList<Double>();
	String[] tokens3 ;
	public static void main(String[] args)
	{
		DateListToDateArray dltda = new DateListToDateArray();
		dltda.convert();
	}

	public void convert()
	{
		for (int i=0;i<9;i++)
		{
			latestVal.add(new Double(i));
		}

		Object[] o2 = latestVal.toArray();
		System.out.println("Now size of array object2 is "+o2.length);
		tokens3 = Arrays.asList(o2).toArray(new String[o2.length]);
	}
}

[Pramod P Deore]

After changing code as it works now:

import java.util.*;

public class DateListToDateArray
{
	ArrayList <Double> latestVal = new ArrayList<Double>();
	String[] tokens3 ;
	public static void main(String[] args)
	{
		DateListToDateArray dltda = new DateListToDateArray();
		dltda.convert();
	}

	public void convert()
	{
		for (int i=0;i<9;i++)
		{
			latestVal.add(new Double(i));
		}

		Object[] o2 = latestVal.toArray();

		for (int i=0;i<o2.length;i++)
		{
			System.out.println (o2[i]);
		}
		System.out.println("Now size of array object2 is "+o2.length);
		
		tokens3 = new String[o2.length];

		for(int i = 0; i >< o2.length; i++)

		{

			System.out.println("tArray: " + o2[i]);

			tokens3[i] = o2[i].toString();

		}

		System.out.println ("**********************");
		for (int i=0;i<tokens3.length;i++)
		{
			System.out.println (tokens3[i]);
		}
		//tokens3 = Arrays.asList(o2).toArray(new String[o2.length]);		
	}
}

>

[Shamayla Bukhari]

Why are you first converting it to an object array. Just Iterate over the double list and store it in the string array by calling toString() on the List Items.

            tokens3 = new String[latestVal.size()];
            for (int i=0;i<latestVal.size();i++)  
            {  
                tokens3[i] = latestVal.get(i).toString();  
            }

[Seetharaman Venkatasamy]

Welcome to JavaRanch Shamayla

[Rob Spoor]

Pramod P Deore wrote:Hi all I have ArrayList of type as <Double>. Now I want to convert this into String[]. But it throws java.lang.ArrayStoreException. As per docs

Thrown to indicate that an attempt has been made to store the wrong type of object into an array of objects.

But still not clear Here is my code

import java.util.*;

public class DateListToDateArray
{
	ArrayList <Double> latestVal = new ArrayList<Double>();
	String[] tokens3 ;
	public static void main(String[] args)
	{
		DateListToDateArray dltda = new DateListToDateArray();
		dltda.convert();
	}

	public void convert()
	{
		for (int i=0;i<9;i++)
		{
			latestVal.add(new Double(i));
		}

		Object[] o2 = latestVal.toArray();
		System.out.println("Now size of array object2 is "+o2.length);
		tokens3 = Arrays.asList(o2).toArray(new String[o2.length]);
	}
}

This code is trying to put Double objects into a String[]. That's not allowed.

[Pramod P Deore]

Thanks Shamayla and Rob.