What did i do wrong on thing method?

[PureAwesomeness]

What did i do wrong on thing("this") method?
i recieved an error that the program is out of bound
i know i did someting wrong with the method in greed text.
Im looking at it and i cant find out where the error occurs.
can someone please tell me?

import java.util.Scanner;

public class sort2D
{
	public static void main (String [] args)
	{

	Scanner input = new Scanner(System.in);

	System.out.println("Enter an integer for number of rows range from 3 to 10: ");
	int m = input.nextInt();

	while (m<3 || m>10)
	{
	System.out.println("Enter an integer for number of rows range from 3 to 10 again: ");
		m = input.nextInt();
	}

	System.out.println("Enter an integer for number of columns range from 3 to 10: ");
	int n = input.nextInt();

	while (n<3 || n>10)
	{
	System.out.println("Enter an integer for number of columns range from 3 to 10 again: ");
		n = input.nextInt();
	}

	int [] [] arr = new int [m] [n];

//generate random numbers
	for (int i=0; i<arr.length; i++)
	{
		for (int j=0; j<arr[n].length; j++)
		{
			arr [i][j]= (int)((Math.random()*30)+1);
		}
	}

//display arr

	int [][] arr1 = decRow(arr);
	for (int i=0; i<arr.length; i++)
	{

		for(int j=0; j<arr[n].length; j++)
		{
			System.out.print(arr1[i][j]+" ");
		}
	}


}//end of main


[COLOR="SeaGreen"]//method for sorting numbers in each row

	public static int[][] decRow(int[][] arr)
	{
		int [][] newArr = new int[arr.length][arr[0].length];
		for (int i=0; i<arr.length; i++)
		{
		for (int j = arr.length - 1; j >= 1; j--)

			{
					int max = arr[i][0];
					int maxloc =0;

				for (int k=1; k<=j; k++)
				{
					if(max<arr[i][k])
					{
						max = arr[i][k];
						maxloc = j;
				    }
				}

			if (maxloc != j)
			{
			        newArr[i][maxloc] = arr[i][j];
			        newArr[i][j] = max;
			}

			}
		}
		return newArr;
	}[/COLOR]
	}//end of class

[emceenugget]

please let us know exactly what and where your error is. i don't see any thing("this") method

[PureAwesomeness]

please let us know exactly what and where your error is. i don't see any thing("this") method

there is a typo on my title suppose to be "this" not "thing"
i need someone help me check the method in green code
which is the one below

//method for sorting numbers in each row

	public static int[][] decRow(int[][] arr)
	{
		int [][] newArr = new int[arr.length][arr[0].length];
		for (int i=0; i<arr.length; i++)
		{
		for (int j = arr.length - 1; j >= 1; j--)

			{
					int max = arr[i][0];
					int maxloc =0;

				for (int k=1; k<=j; k++)
				{
					if(max<arr[i][k])
					{
						max = arr[i][k];
						maxloc = j;
				    }
				}

			if (maxloc != j)
			{
			        newArr[i][maxloc] = arr[i][j];
			        newArr[i][j] = max;
			}

			}
		}
		return newArr;
	}

[Eranga]

Again, can you explain what your method suppose to do.

[PureAwesomeness]

i think i figured out the "out of bound error"

example
5213
4562
0542

the ideal output is
5321
6542
5420

im trying to use selection sort for the numbers in each row

//method for sorting numbers in decending order in each rows

	public static int[][] decRow(int[][] arr)
	{
		int [][] newArr = new int[arr.length][arr[0].length];
		for (int i=0; i<arr.length; i++)
		{
		for (int j =1; j <= arr[0].length - 1; j++)

			{
					int min = arr[i][0];
					int minloc =0;

				for (int k=1; k<=j; k++)
				{
					if(min>arr[i][k])
					{
						min = arr[i][k];
						minloc = j;
					}
				}

			if (minloc != j)
			{
					newArr[i][minloc] = arr[i][j];
					newArr[i][j] = min;
			}

			}
		}
		return newArr;
	}

[Eranga]

How did you match the input into 2D array?

[PureAwesomeness]

How did you match the input into 2D array?

i don't get what do you mean by that.

[Eranga]

Your input is this.

5213
4562
0542

But you want to pass 2D array, into the method decRow. How did you match those two.

[PureAwesomeness]

that is just an example
i create an array and generate random numbers with in it then pass it to the method
is this what you meant?

import java.util.Scanner;

public class sort2D
{
	public static void main (String [] args)
	{

	Scanner input = new Scanner(System.in);

	System.out.println("Enter an integer for number of rows range from 3 to 10: ");
	int m = input.nextInt();

	while (m<3 || m>10)
	{
	System.out.println("Enter an integer for number of rows range from 3 to 10 again: ");
		m = input.nextInt();
	}

	System.out.println("Enter an integer for number of columns range from 3 to 10: ");
	int n = input.nextInt();

	while (n<3 || n>10)
	{
	System.out.println("Enter an integer for number of columns range from 3 to 10 again: ");
		n = input.nextInt();
	}

	int [] [] arr = new int [m] [n];

//generate random numbers
	for (int i=0; i<arr.length; i++)
	{
		for (int j=0; j<arr[n].length; j++)
		{
			arr [i][j]= (int)((Math.random()*30)+1);
		}
	}
//display arr

	int [][] arr1 = decRow(arr);
	for (int i=0; i<arr.length; i++)
	{

		for(int j=0; j<arr[n].length; j++)
		{
			System.out.print(arr1[i][j]+" ");
		}
	}

[Eranga]

Ya, it's fine. Reason to ask that question is your requirement is not clear. Better to explain it more clearly. Your code posted earlier and the input/output make some mess-up.