Program to remove all the occurences of a given character from a String.

package com.demo;

public class RemoveCharacter {

	public static void main(String[] args) {

		// input string
		String inputString = "Welcome to JavaTechTube";
		// output after removing character
		System.out.println("Output after removing character : " + removeGivenCharacter(inputString, "e"));
	}

	private static String removeGivenCharacter(String inputString, String removeCharacter) {

		inputString = inputString.replace(removeCharacter, "");
		return inputString;
	}
}

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Program to check vowel is present in a given String or not

	

    

    	


    
package com.demo;

public class ContainsVowelsOrNot {

	public static void main(String[] args) {

		//first string
		String str = "Java";
		System.out.println("Vowels is present : "+isVowelsPresent(str));
		//second string
		str = "bcd";
        	System.out.println("Vowels is present : "+isVowelsPresent(str));
	}

	private static boolean isVowelsPresent(String str) {
		
		if(str == null) {
        	throw new IllegalArgumentException();
        }
        
        return str.toLowerCase().matches(".*[aeiou].*");
	}

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