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How to find int, uppercase, lowercase, whitespace and numbers in a string

SOLVED, thanks to everyone who helped!

I'm new to java and I've been stuck with this issue for a long time ... whenever I execute my code it compiles, but when I run it and put in a line (any line) I get this error:

java.lang.StirngIndexOutOfBoundsException: Stirng index out of range: at java.lang.String.charAt (unknown source) at Reading.main (Reading.java:48)

Can someone please help me? this is my code:

import java.awt.*;  
import javax.swing.*;
import java.util.*;

public class Reading{
    static Scanner input = new Scanner(System.in);
    public static void main(String [] args){
        System.out.println("Enter a string of characters: ");   
        int i, Upper=0, Lower=0, Space=0, Digits=0;
        String answer = input.nextLine();
        for(i = 0; i <= answer.length(); i++);
        {
            if(Character.isUpperCase(answer.charAt(i)))
                Upper++;
            if(Character.isLowerCase(answer.charAt(i)))
                Lower++;
            if(Character.isDigit(answer.charAt(i))) 
                Digits++;
        if (answer.charAt(i)==' ')
            Space++;
            System.out.println("There are " + Upper + " upper case letters");
            System.out.println("There are " + Lower + " lower case letters");
            System.out.println("There are " + Digits + " digits");
            System.out.println("There are " + Space + " spaces");
        }
        System.exit(0);
    }
}
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3 answers


You must change

for (i = 0; i <= answer.length(); i++) ;

to

for (i = 0; i <answer.length(); i++) ;

There is no match for answer.charAt(answer.length())

, and not only



You need to delete

for(i = 0; i <= answer.length(); i++); <==remove ;

Then the for loop should like

for (i = 0; i < answer.length(); i++) {
     if (Character.isUpperCase(answer.charAt(i)))
         Upper++;
     if (Character.isLowerCase(answer.charAt(i)))
         Lower++;
     if (Character.isDigit(answer.charAt(i)))
         Digits++;
     if (i == ' ') // i is an index this should be if(answer.charAt(i)==' ')
         Space++;
 }
+1


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This is a mistake in one go.

Change

for(i = 0; i <= answer.length(); i++);


to

for(i = 0; i < answer.length(); i++);
0


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you get a range error because the pointer was out of index answer

. the array starts at 0 and ends at array.length()-1

, so you need to change the code and delete =

at <=

, after which it will go tolength-1

and for the odometer, you need to compare the i-th character of yours answer

with a space, that means you need to replace if(i == ' ')

with if(answer.charAt(i) == ' ')

.

this is what you wanted:

import java.awt.*;
import javax.swing.*;
import java.util.*;

/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
    static Scanner input = new Scanner(System.in);
    public static void main(String [] args)
    {
        System.out.println("Enter a string of characters: ");   
        int i, Upper=0, Lower=0, Space=0, Digits=0;
        String answer = input.nextLine();
        System.out.println("Enter a string of characters2: ");
        for(i = 0; i < answer.length(); i++);
        {
            if(Character.isUpperCase(answer.charAt(i)))
                Upper++;

            if(Character.isLowerCase(answer.charAt(i)))
                Lower++;

            if(Character.isDigit(answer.charAt(i))) 
                Digits++;

            if (answer.charAt(i)==' ')
            Space++;

             System.out.println("There are " + Upper + " upper case letters");
             System.out.println("There are " + Lower + " lower case letters");
             System.out.println("There are " + Digits + " digits");
             System.out.println("There are " + Space + " spaces");
        }
        System.exit(0);
    }

}
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