Description The Fields object represents a collection of columns in a table. The term field is synonymous with column. Each table in a database has an ordered collection of fields, there is always at least one field in a table. The ordered collection
接口的基本语法一: 1.使用interface 定义 2.接口当中的方法都是抽象方法 3.接口当中的方法都是public权限 接口的定义: interface USB { public void read(); public void write(); } 接口的实现: class USBPhone implements USB { public void read() { System.out.println("USBPhone read"); } public void write
Class定义常量方法(推荐方法) //final修饰符 public final class Constants { //私有构造方法 private Constants() {} public static final int ConstantA = 100; public static final int ConstantB = 100; ...... } 采用“类.常量名”方法进行调用.需要私有化构造方法,避免创建该类的实例.同时不需让其他类继承该类. 如果多处需要访问工具类中定义的常量
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