Closed. This question is not reproducible or was caused by typos. It is not currently accepting answers.
This question was caused by a typo or a problem that can no longer be reproduced. While similar questions may be on-topic here, this one was resolved in a way less likely to help future readers.
Closed 6 years ago.
Improve this question
I'm just really confused on why there's an error at the for statement line. This is literally code from a tutorial that I can't run because there's an error at line 3
class RoundOne{
public static void main(String[] args){
for(int i =0,i<10,i++){
System.out.println("The number is: "+i);
}
}
}
for(int i =0;i<10;i++){
System.out.println("The number is: "+i);
}
You wrote , instead of ;
In your for loop instead of
for(int i =0,i<10,i++)
write
for(int i =0;i<10;i++)
For loops use ; between the parts, not ,
class RoundOne {
public static void main(String[] args) {
for (int i = 0; i < 10; i++) {
System.out.println("The number is: " + i);
}
}
}
Related
Closed. This question is not reproducible or was caused by typos. It is not currently accepting answers.
This question was caused by a typo or a problem that can no longer be reproduced. While similar questions may be on-topic here, this one was resolved in a way less likely to help future readers.
Closed 2 years ago.
Improve this question
The below code is not giving any error. After debugging i found it is not going inside the first loop.
package string_pattern;
public class Naive {
public static void main(String[] args)
{
String pattern="This is a text book";
String text="text";
child obj=new child();
obj.search(pattern, text);
}
}
class child{
public void search(String pat,String text)
{
int m,n;
m=pat.length();
n=text.length();
System.out.println("i am outside loop");
for(int i=0; i<= (n-m); i++)
{
int j;
System.out.println("i am inside first loop");
for(j=0;j<m;j++)
{
if(text.charAt(i+j) != pat.charAt(j))
{
System.out.println("OVER HERE");
break;
}
if(j==m)
System.out.println("pattern found at pos" + i);
}
}
}
}
You do the following:
m=pat.length();
n=text.length();
The problem is that text has a length of 4, while pat is longer. So when you do the loop like this -> for(int i=0; i<= (n-m); i++), you end up with a negative number. Since 0 is greater than any negative number you never enter the loop.
Closed. This question is not reproducible or was caused by typos. It is not currently accepting answers.
This question was caused by a typo or a problem that can no longer be reproduced. While similar questions may be on-topic here, this one was resolved in a way less likely to help future readers.
Closed 4 years ago.
Improve this question
I can not figure out why my code won't let me remove a value from my list. I am suppose to make the list have 10 values in it, and then when I want to take a value out and replace it I use remove() and then add(). My error says this:
Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 9
at MyList.remove(MyList.java:36)
at MyListDriver.main(MyListDriver.java:17)
Here is my code for those sections:
public class MyListDriver{
public static void main(String[] args){
MyList alpha = new MyList(9);
alpha.add("22");
alpha.add("2");
alpha.add("1");
alpha.add("22");
alpha.add("13");
alpha.add("6");
alpha.add("7");
alpha.add("32");
alpha.add("172");
alpha.add("2");
alpha.remove("12");
alpha.add("23");
alpha.print();
}
}
And the section from the MyList that is the remove(), which is where I am getting an error.
public void remove(String data){
int index = 0;
for(int r = 0; r <=arr.length; r++)
{
if(arr[r].equals(data)){
index=r;
break;
}
}
remove(index);
}
public void remove(int index){
if(index>=0 && index<loc){
for(int i=index; i<loc-1; i++){
arr[index]=arr[index+1];
}
loc--;
}
}
I am suppose to have an overloaded remove method. I dont know why I am getting an Array out of bounds error.
Thank you for any help in advance.
I know U got The Answer
for(int r = 0; r <=arr.length; r++)
{
if(arr[r].equals(data)){
index=r;
break;
}
}
why u getting ArrayIndexOutOfBoundsException
because of when r=arr.lenght for Ex. array lenght is 3 means 0 1 2
when r=3 the condition retunrn true because 3<=3 so change it
for(int r = 0; r < arr.length; r++)
{
if(arr[r].equals(data)){
index=r;
break;
}
}
Closed. This question is not reproducible or was caused by typos. It is not currently accepting answers.
This question was caused by a typo or a problem that can no longer be reproduced. While similar questions may be on-topic here, this one was resolved in a way less likely to help future readers.
Closed 7 years ago.
Improve this question
So my problem is that it keeps saying I already defined String spaces up top but if I take the definition that's outside of the loop away and try to define spaces only in the loop, it tells me it hasn't been instantiated...
public class NestedLoop {
public static void main (String [] args) {
int userNum = 0;
int i = 0;
int j = 1;
String spaces = "";
Scanner scnr = new Scanner(System.in);
System.out.print("Enter userNum:");
userNum = scnr.nextInt();
for (i = 0; i <= userNum; i++) {
while (j == i){
spaces = spaces.concat(" ");
System.out.print(spaces);
j++;}
System.out.println(i);}
Error: main.java:244: spaces is already defined in main(java.lang.String[])
I just ran this code in my IDE and got no errors, compile time or run time. Not sure I can replicate the errors you're reporting. Only possibility I could think of is an error with your JDK, but at the same time I dunno how or why that would occur.
Closed. This question is not reproducible or was caused by typos. It is not currently accepting answers.
This question was caused by a typo or a problem that can no longer be reproduced. While similar questions may be on-topic here, this one was resolved in a way less likely to help future readers.
Closed 7 years ago.
Improve this question
I want to display multi arrays.
public class apples {
public static void main(String[] args){
int Tabela_Nr1[][] = {{8,9,10,11}, {12,13,14,15}};
int Tabela_Nr2[][] = {{30,31,32,33}, {43},{4,5,6,}};
System.out.println("To jest pierwsza tabela: ");
wyswietl(Tabela_Nr1);
System.out.println("To jest druga tabela: ");
wyswietl(Tabela_Nr2);
}
public static void wyswietl(int x [][]){
for (int row = 0; row < x.length; row++){
for(int counter = 0; counter < x[row].length; counter++);
System.out.print(x[row][counter] + "\t");
}
System.out.println();
}
}
Debugger tells me that variable counter is not declare, but it is in "for" loop...
What is the cuz of the problem ?
Console:
Exception in thread "main" java.lang.Error: Unresolved compilation problem:
counter cannot be resolved to a variable
at apples.wyswietl(apples.java:15)
at apples.main(apples.java:8)
The problem is the extra semi colon :
for (int row=0;row<x.length;row++){
for(int counter=0;counter<x[row].length;counter++); //<-- here
System.out.print(x[row][counter]+"\t");
This semi colon end the inner loop, which means the print statement is outside the loop, where counter is unknown.
I think that your System.out.println(); is also wrongly placed. You probably want to place it after each row :
public static void wyswietl(int x[][]){
for (int row=0;row<x.length;row++) {
for(int counter=0;counter<x[row].length;counter++) {
System.out.print(x[row][counter]+"\t");
}
System.out.println();
}
}
for(int counter=0;counter<x[row].length;counter++); --> remove the ; and it will work just fine :)
BTW you might also want to look into --> Arrays.deepToString() which displays multi-dimensional arrays.
Closed. This question is not reproducible or was caused by typos. It is not currently accepting answers.
This question was caused by a typo or a problem that can no longer be reproduced. While similar questions may be on-topic here, this one was resolved in a way less likely to help future readers.
Closed 9 years ago.
Improve this question
I've just started working with some programming in java. I'm experimenting with loops and I have a problem with a for-loop where I'm having a hard time finding the mistake. Its saying that "i" is not a variable, even though i made it one in just above. Hope you guys can help!
import java.util.Scanner;
public class Loops {
public static void main(String [] args)
{
Scanner sc = new Scanner(System.in);
System.out.println("Skriv et tal");
int a = sc.nextInt();
for(int i = 0; i <= 9; i++);
{
System.out.println(a + i);
}
}
}
for(int i=0; i<=9;i++);
// ^ get rid of this
should be
for(int i=0; i<=9;i++)
Because of that the for statement ends there and the new block had been started there.
Beware of the ; behind your loop definition. It is an empty statement.