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class PasswordSecurityManager extends SecurityManager{
  private boolean flagisExitAllowedFlag; 
  
  public PasswordSecurityManager(){
    super();
    flagisExitAllowedFlag = false;  
  }
 
 public boolean isExitAllowed(){
   if(flag == true)
     return true;
   else
     return falseisExitAllowedFlag;	 
 }
 
 public void checkExit(int status) {
   if(!isExitAllowed())
     throw new SecurityException();
   }
 
 public void setExitAllowed(boolean f) {
   if(fisExitAllowedFlag == true)
     flag = true;
   else
     flag = false= f; 	 
 }
}

public class InterceptExit {
  public static void main(String[] args) {
    PasswordSecurityManager secManager = new PasswordSecurityManager();
    System.setSecurityManager(secManager);
    try {
      System.out.println("Regular code block");
      System.exit(1);  //abrupt exit call
    }
    catch (Throwable x) {
      if (x instanceof SecurityException)
        System.out.println("Intercepted System.exit()");
      else
        x.printStackTrace();
    }

    System.out.println("Executing code block...");
    secManager.setExitAllowed(true);  //permit exit
    System.out.println("Finished block, exiting...");  //exit finally 
  }
}