Java Int to String

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    class DoNotTerminate {

    public static class ExitTrappedException extends SecurityException {

    private static final long serialVersionUID = 1; }

    public static void forbidExit() { final SecurityManager securityManager = new SecurityManager() { @Override public void checkPermission(Permission permission) { if (permission.getName().contains("exitVM")) { throw new ExitTrappedException(); } }

     What is meaning of this code or what is need for this code ?
    

    }; System.setSecurityManager(securityManager); } }