1. import java.util.HashMap;
  2. import java.util.Map;
  4. public class TokenMonitor {
  6. private final Map<String, String> storedTokens = new HashMap<>(); // Store old tokens
  7. private String currentToken; // Current token
  9. public synchronized void setToken(String token) {
  10. currentToken = token; // Update current token
  11. storedTokens.put(currentToken, token); // Store the new token
  12. }
  14. public synchronized String getCurrentToken() {
  15. return currentToken; // Return the current token
  16. }
  18. public synchronized boolean isTokenValid(String token) {
  19. return storedTokens.containsKey(token);
  20. }
  22. public synchronized void removeToken(String token) {
  23. storedTokens.remove(token); // Remove token from stored tokens
  24. }
  26. public static void main(String[] args) throws InterruptedException {
  27. TokenMonitor monitor = new TokenMonitor();
  29. // Simulate token changes
  30. monitor.setToken("oldToken1");
  31. System.out.println("Current token: " + monitor.getCurrentToken()); // Output: oldToken1
  33. monitor.setToken("newToken1");
  34. System.out.println("Current token: " + monitor.getCurrentToken()); // Output: newToken1
  36. // Check if an old token is still valid
  37. System.out.println("Is oldToken1 valid? " + monitor.isTokenValid("oldToken1")); // Output: true
  39. //Remove an old token
  40. monitor.removeToken("oldToken1");
  41. System.out.println("Is oldToken1 valid after removal? " + monitor.isTokenValid("oldToken1")); //Output: false
  42. }
  43. }

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