props.put("mail.smtp.starttls.enable", "true");
String value() default ""; // 默认值为空字符串
ResultSet resultSet=preparedStatement.executeQuery();
在Java中/正版资料免费资料大全十点半,System.out.println() 方法是哪个类的方法?
public static void main(String[] args) {
String lowerCaseStr = str1.toLowerCase();
String[] students = {"张山", "李四", "赵五", "钱一"};