using arraylists

[qwerty_ytrewq]

consider my input file has the following data

date type of transaction amount
1 w 100
2 d 230
3 d 550
4 w 430
5 d 1100
6 d 400

so i need to sort the amount in ascending order.So when i sort the amount,the corresponding date and transaction also needs to be sorted.I want the solution when we use arraylists for sorting.Could you help me?

[Freaky_Chris]

Get us started with some code and we will love to help you,

[Ezzaral]

Assuming that each transaction line item is an object in a List, you can simply call Collections.sort(java.util.List, java.util.Comparator) with an appropriate Comparator to compare on amount.

[qwerty_ytrewq]

hey..i normally used two for loops and did parallel sorting like this

public class BankAcc {
	public static void main(String args[])
	throws IOException
	{
		BufferedReader br=new BufferedReader(new FileReader("Input.txt"));
		String inline;
		String type[]=new String[25];
		int date[]=new int[25];
		int amount[]=new int[25];
		int count=0;
		while((inline=br.readLine())!=null)
		{
			count++;
			StringTokenizer st=new StringTokenizer(inline);
			{
				while(st.hasMoreTokens())
				{
					date[count]=Integer.parseInt(st.nextToken());
					type[count]=st.nextToken();
					amount[count]=Integer.parseInt(st.nextToken());
				}
			}
		}
		System.out.println("sorted order");//instead of such long code below,i want to use arraylists to do the below code
		for(int i=1;i<=count;i++)
		{
			for(int j=i+1;j<=count;j++)
			{
				if(date[i]>date[j])
				{
					int t=date[i];
					date[i]=date[j];
					date[j]=t;
					
					int t1=amount[i];
					amount[i]=amount[j];
					amount[j]=t1;
					
					String t2=type[i];
					type[i]=type[j];
					type[j]=t2;
				}
			}
			System.out.println(date[i] + " "+ type[i] + " " + amount[i]);
		}

[Ezzaral]

Those are arrays - not ArrayLists - and why are you not using an object to represent each line item instead of three separate arrays for each piece of data?