Hello I have a problem reading integer values from scanner. Program sorts two arrays and saves the sorted values into new array and then it writes it on the console output. Here is exception:
Exception in thread "main" java.util.NoSuchElementException
at java.util.Scanner.throwFor(Unknown Source)
at java.util.Scanner.next(Unknown Source)
at java.util.Scanner.nextInt(Unknown Source)
at java.util.Scanner.nextInt(Unknown Source)
at U42Slevani.main(U42Slevani.java:40)
Here is my code.
package u42slevani;
import java.util.Scanner;
/**
*
* @author matej.rehak
*/
public class U42Slevani {
/**
* @param args the command line arguments
*/
public static void main(String[] args) {
// TODO code application logic here
Scanner sc = new Scanner(System.in);
int[] pole1;
int[] pole2;
int pocet=1;
while(pocet>0)
{
int pom;
int j;
pocet = sc.nextInt();
if(pocet<0 || pocet>1000)
{
break;
}
pole1 = new int[pocet];
for(int i = 0;i<pole1.length;i++)
{
pole1[i] = sc.nextInt();
}
pocet = sc.nextInt(); //problem here
if(pocet<0 || pocet>1000)
{
break;
}
pole2 = new int[pocet];
for(int i = 0;i<pole2.length;i++)
{
pole2[i] = sc.nextInt();
}
for (int i = 1; i<pole1.length; i++)
{
pom = pole1[i];
j = i - 1;
while ((j >= 0 ) && (pole1[j] > pom))
{
pole1[j+1] = pole1[j];
j--;
}
pole1[j+1] = pom;
}
for (int i = 1; i<pole2.length; i++)
{
pom = pole2[i];
j = i - 1;
while ((j >= 0 ) && (pole2[j] > pom))
{
pole2[j+1] = pole2[j];
j--;
}
pole2[j+1] = pom;
}
int[] pole3 = new int[pole1.length+pole2.length];
merge(pole3, pole1, pole2);
StringBuilder vystup = new StringBuilder("");
for (int i = 0; i < pole3.length - 1; i++)
{
vystup.append(pole3[i] + " ");
}
vystup.append(pole3[pole3.length -1]);
System.out.println(vystup);
}
}
public static void merge(int[] list, int[] left, int[] right) {
int i = 0;
int j = 0;
// dokud nevyjedeme z jednoho z poli
while ((i < left.length) && (j < right.length)) {
// dosazeni toho mensiho prvku z obou poli a posunuti indexu
if (left[i] < right[j]) {
list[i + j] = left[i];
i++;
}
else {
list[i + j] = right[j];
j++;
}
}
// doliti zbytku z nevyprazdneneho pole
if (i < left.length) {
while (i < left.length) {
list[i + j] = left[i];
i++;
}
}
else {
while (j < right.length) {
list[i + j] = right[j];
j++;
}
}
}
}
I know problem is on line 41 but I don't know why. Thank you.
You are trying to read the next integer from the underlying stream of the Scanner
by calling nextInt()
, even though you are not sure there is something to be read. If you try to read the next integer when there is none to be read, a NoSuchElementException
will be thrown.
Solve this by first checking if there is an integer to be read, and in that case read it.
if(sc.hasNextInt())
{
pocet = sc.nextInt();
}
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