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Neelakandan R
Neelakandan R

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Remove Vowel-java,PasswordValidator,Regex,Password Valitation

#java #programming #payilagam

1)Remove Vowel

package pratice; import java.util.Scanner; public class Vowel { public static void main(String[] args) { Scanner sc =new Scanner(System.in); System.out.println("Enter word :"); String sh=sc.nextLine(); for(int i=0;i<sh.length();i++) { char ch=sh.charAt(i); if(!(ch=='a' && ch=='A'||ch=='e' && ch=='E'||ch=='i' && ch=='I'||ch=='o' && ch=='O'||ch=='u' && ch=='U')) { System.out.print(ch+" "); } } } }
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Output:

Enter word :
salman guruji
s l m n g r j

2)Find Vowel:

package pratice; import java.util.Scanner; public class Vowel { public static void main(String[] args) { Scanner sc = new Scanner(System.in); System.out.println("Enter word :"); String sh = sc.nextLine(); for (int i = 0; i < sh.length(); i++) { char ch = sh.charAt(i); if ((ch == 'a' || ch == 'A' || ch == 'e' || ch == 'E' || ch == 'i' || ch == 'I' || ch == 'o' || ch == 'O' || ch == 'u' || ch == 'U')) { System.out.print(ch + " "); } } } }
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Output:
Enter word :
salman guruji
a a u u i

3)PasswordValidator

package pratice; public class PasswordValidatorSimple { public static void main(String[] args) { String password = "Gbc123@"; boolean upper = false; boolean lower = false; boolean number = false; boolean special = false; for (int i = 0; i < password.length(); i++) { char ch = password.charAt(i); if (ch >= 'A' && ch <= 'Z') { upper = true; } else if (ch >= 'a' && ch <= 'z') { lower = true; } else if (ch >= '0' && ch <= '9') { number = true; } else { special = true; } } if (upper && lower && number && special == true) { System.out.println("Password is valid"); } else { System.out.println("Password is invalid"); } } }
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Output:
Password is valid

4)Regex

Explanation of the Regex:

PR → starts with PR
\d → digit (0–9), double backslash because Java needs to escape \
{6} → exactly 6 digits

public class PRFormatChecker { public static void main(String[] args) { String input = "PR123456"; String pattern = "PR\\d{6}"; // Check if the input matches the pattern if (input.matches(pattern)) { System.out.println("Valid format"); } else { System.out.println("Invalid format"); } } }
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Input Output
PR123456 Valid format
PR12345 Invalid format
PX123456 Invalid format
PR123A56 Invalid format

5)Password Valitation:

public class PasswordValidatorSimple { public static void main(String[] args) { String password = "Abc123@"; boolean upper = false; boolean lower = false; boolean number = false; boolean special = false; for (int i = 0; i < password.length(); i++) { char ch = password.charAt(i); if (ch >= 'A' && ch <= 'Z') { upper = true; } else if (ch >= 'a' && ch <= 'z') { lower = true; } else if (ch >= '0' && ch <= '9') { number = true; } else { special = true; } } if (upper && lower && number && special) { System.out.println("Password is valid"); } else { System.out.println("Password is invalid"); } } }
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Output:

Password is valid

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