JAVA PROGRAMMING: hasVowels2 sample code

Definition and Usage

The indexOf() method returns the position of the first occurrence of specified character(s) in a string.

Tip: Use the lastIndexOf method to return the position of the last occurrence of specified character(s) in a string.

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Syntax

There are 4 indexOf() methods:

public int indexOf(String str)
public int indexOf(String str, int fromIndex)
public int indexOf(int char)
public int indexOf(int char, int fromIndex)

Parameter Values

Parameter	Description
str	A String value, representing the string to search for
fromIndex	An int value, representing the index position to start the search from
char	An int value, representing a single character, e.g 'A', or a Unicode value

Technical Details

  

Returns:	An int value, representing the index of the first occurrence of the character in the string, or -1 if it never occurs

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hasVowels java code Examples

import java.util.Scanner;

public class has_vowels_2
{  
  public static boolean has_vowels(String s)
  {
    for (int i = 0; i < s.length(); i++)
    {
      if ("aeiouAEIOU".indexOf(s.charAt(i)) >= 0)
      {
        return true;
      }
    }
    
    return false;
  }

  public static void main(String[] args) 
  {
    Scanner in = new Scanner(System.in);
    System.out.printf("Enter a word: ");
    String word = in.next();
    boolean result = has_vowels(word);
    System.out.printf("result = %b\n", result);
  }
}