76 lines
2.3 KiB
Java
76 lines
2.3 KiB
Java
package org.Exceptions;
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import java.util.regex.Pattern;
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public class RuntimeExceptionDemo {
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public static void main(String[] args) {
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UserEntity user = new UserEntity("Ali", "Ahmadi", 1234567890L,
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null, 989111111111L, null);
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validateEmail(user);
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calculatePayment(5000, 0);
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convertUserAge("twenty");
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completeRegistration(user);
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}
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//nullPointerException
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//IllegalArgumentException
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public static void validateEmail(UserEntity user) {
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try {
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String email = user.getEmail();
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String emailRegex = "^[A-Za-z0-9+_.-]+@[A-Za-z0-9.-]+$";
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if (!Pattern.matches(emailRegex, email)) {
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throw new IllegalArgumentException("Invalid email format");
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}
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System.out.println("User email is valid");
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} catch (NullPointerException e) {
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System.out.println("Error: email is null - " + e.getMessage());
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} catch (IllegalArgumentException e) {
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System.out.println("Error: " + e.getMessage());
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}
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}
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// ArithmeticException
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public static void calculatePayment(int totalAmount, int installmentCount) {
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try {
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int payment = totalAmount / installmentCount;
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System.out.println("Each installment : " + payment);
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} catch (ArithmeticException e) {
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System.out.println("Error: cannot divide by zero - " + e.getMessage());
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}
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}
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// NumberFormatException
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public static void convertUserAge(String ageInput) {
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try {
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int age = Integer.parseInt(ageInput);
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System.out.println("User age: " + age);
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} catch (NumberFormatException e) {
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System.out.println("Error: invalid number format - " + e.getMessage());
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}
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}
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// IllegalStateException
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public static void completeRegistration(UserEntity user) {
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try {
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if (user.getDateOfBirth() == null) {
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throw new IllegalStateException(
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"Registration cannot be completed. Date of birth is missing."
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);
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}
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System.out.println("Registration completed");
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} catch (IllegalStateException e) {
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System.out.println("Error: " + e.getMessage());
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}
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}
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} |