homework/ConsoleLogger.java

public class ConsoleLogger implements Logger {
    private static final String DEBUG_PREFIX = "[DEBUG] ";
    private static final String INFO_PREFIX = "[INFO] ";
    private static final String WARN_PREFIX = "[WARN] ";
    private static final String ERROR_PREFIX = "[ERROR] ";

    @Override
    public void debug(String message) {
        System.out.println(getTimestamp() + DEBUG_PREFIX + message);
    }

    @Override
    public void info(String message) {
        System.out.println(getTimestamp() + INFO_PREFIX + message);
    }

    @Override
    public void warn(String message) {
        System.out.println(getTimestamp() + WARN_PREFIX + message);
    }

    @Override
    public void error(String message) {
        System.err.println(getTimestamp() + ERROR_PREFIX + message);
    }

    @Override
    public void error(String message, Throwable throwable) {
        System.err.println(getTimestamp() + ERROR_PREFIX + message);
        if (throwable != null) {
            throwable.printStackTrace();
        }
    }

    /**
     * 获取当前时间戳
     * @return 格式化的时间戳字符串
     */
    private String getTimestamp() {
        return java.time.LocalDateTime.now().format(java.time.format.DateTimeFormatter.ISO_LOCAL_DATE_TIME) + " ";
    }
}