Finding all uppercase letters of a string in java

Question

So I\'m trying to find all the uppercase letters in a string put in by the user but I keep getting this runtime error:

Exception in thread \"main\" java.lan         


        

Answer 1

for(int y = 0; y <= z; y++){

should be

for(int y = 0; y < z; y++){

Remember array index starts from ZERO.

String length returns

the number of 16-bit Unicode characters in the string

Because loop started from ZERO, loop should terminate at length-1.

Answer 2

Hi one of the easy step to find uppercase char in a given string...

Program

import java.io.*;
public class testUpper 
{
    public static void main(String args[]) throws IOException
    {
        String data,answer="";
        BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
        System.out.println("Enter any String : ");
        data=br.readLine();
        char[] findupper=data.toCharArray();
        for(int i=0;i<findupper.length;i++)
        {
            if(findupper[i]>=65&&findupper[i]<=91) //ascii value in between 65 and 91 is A to Z
            {
                answer+=findupper[i]; //adding only uppercase
            }
        }
        System.out.println("Answer : "+answer);
    }
}

Output

Enter any String :

Welcome to THe String WoRlD

Answer : WTHSWRD

Answer 3

With Java 8 you can also use lambdas. Convert the String into a IntStream, use a filter to get the uppercase characters only and create a new String by appending the filtered characters to a StringBuilder:

Scanner in = new Scanner(System.in);
System.out.print("Please give a string: ");
//Uppercase
String isUp = in.next()
        .chars()
        .filter(Character::isUpperCase)
        .collect(StringBuilder::new, // supplier
                StringBuilder::appendCodePoint, // accumulator
                StringBuilder::append) // combiner
        .toString();
System.out.println("The uppercase characters are " + isUp);
//Uppercase

Inspired by:

• Adam Bien - Streaming A String
• Simplest way to print anIntStream as a String

Answer 4

public static void main(String[] args) {
    Scanner input = new Scanner(System.in);
    System.out.println("Enter the number");
    String str= input.nextLine();

    int ascii;
    for(int i=0; i<str.length(); i++) {
        ascii = str.charAt(i);
        System.out.println(ascii);
        if (ascii >= 65 && ascii <= 90) {
            System.out.println("captal letter found ::: "+ascii);
        }
    }
}