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It is not going inside the first loop and only printing I am outside loop only [closed]

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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.

Why am I getting an Array out of bounds error? [closed]

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Closed 4 years ago.
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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;
}
}

For statement solution [closed]

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Closed 6 years ago.
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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);
}
}
}

My program gives wrong output [closed]

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Closed 7 years ago.
Edit the question to include desired behavior, a specific problem or error, and the shortest code necessary to reproduce the problem. This will help others answer the question.
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When I run it, computer counts only 1 3 5 7 9 ... indexes. For example, if I enter "Hello", computer counts 1-H,1-l and 1 o, it doesn't compute e and l(4th index).
What is wrong with it?
import java.util.*;
public class LetterCount {
public static void main(String[] args){
final int Numchars=26;
Scanner scan = new Scanner(System.in);
int[] upper=new int[Numchars];
int[] lower=new int[Numchars];
char current='a';
char current0='A';
int pox=0;
System.out.println("Enter a sentence");
String line=scan.nextLine();
for(int ch=0; ch<line.length(); ch++){
for(int other=0; other<26; other++){
if(line.charAt(ch)==(char)(current+other))
lower[other]++;
if(line.charAt(ch)==(char)(current0+other))
upper[other]++;
else
pox++;
}
ch++;
}
for(int another=0; another<lower.length;another++)
System.out.println((char)(another+'a')+" " +lower[another]);
for(int b=0; b<lower.length;b++)
System.out.println((char)(b+'A')+" " +upper[b]);
System.out.println("non alphabetic characters: "+pox);
}
}

It basically boils down to:
for (int ch = 0; ch < line.length(); ch++) { // Increment per iteration
doSomething();
ch++; // Increment within body
}
in which you increment ch twice!
You need to get rid of one of them and, since the usual way to do a for loop with known-in-advance number of iterations like this is to put the control variable modification into the for statement itself, I would suggest getting rid of the one in the loop body:
for (int ch = 0; ch < line.length(); ch++) {
doSomething();
}

I think you increments ch twice, at the end of for expression and at the end of for loop.

Variable not found in Java [closed]

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Closed 9 years ago.
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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.