![R语言 > pairs(iris[,1:4]) > pairs(iris[1:4]) 这俩语句画的图一样，，那个逗号是干嘛的？？](/aiimages/R%E8%AF%AD%E8%A8%80+%26amp%3Bgt%3B+pairs%28iris%5B%2C1%3A4%5D%29+%26amp%3Bgt%3B+pairs%28iris%5B1%3A4%5D%29+%E8%BF%99%E4%BF%A9%E8%AF%AD%E5%8F%A5%E7%94%BB%E7%9A%84%E5%9B%BE%E4%B8%80%E6%A0%B7%EF%BC%8C%EF%BC%8C%E9%82%A3%E4%B8%AA%E9%80%97%E5%8F%B7%E6%98%AF%E5%B9%B2%E5%98%9B%E7%9A%84%EF%BC%9F%EF%BC%9F.png)
* 歌曲类
*/
public class Music {
public Music() {
super()
}
public Music(String song) {
super()
System.out.println("《"+song+"》")
System.out.println(".....多来米发所拉稀....")
}
}
/**
* 乐器接口，凡实现该接口的都游演奏的功能
*/
public interface Instrument {
public Music musical(String song)
}
/**
* 管弦类乐器
*/
public class Orchestral implements Instrument {
public Music musical(String song) {
System.out.println("下面用管弦类乐器演奏 "+song)
return new Music(song)
}
}
/**
* 弹奏类乐器
*/
public class Spiccato implements Instrument {
public Music musical(String song) {
System.out.println("下面用弹奏类乐器弹奏 "+song)
return new Music(song)
}
}
/**
* 其他类型乐器
*/
public class Other implements Instrument {
String instrument
public Other() {
super()
}
public Other(String instrument) {
this.instrument = instrument
}
public Music musical(String song) {
System.out.println("用 "+instrument+" 演奏的 "+song)
return new Music(song)
}
public static void main(String[] args) {
Other other = new Other("古筝")
other.musical("高山流水")
}
}
/**
* 笛子
*/
public class Fife extends Orchestral {
public Fife(String song) {
super.musical(song)
System.out.println("这是用横笛吹奏的 "+song)
}
}
/**
* 萨克斯
*/
public class Sax extends Orchestral {
public Sax(String song) {
super.musical(song)
System.out.println("这是用萨克斯演奏的 "+song)
}
}
/**
* 吉他
*/
public class Guitar extends Spiccato {
public Guitar(String song) {
super.musical(song)
System.out.println("这是吉他弹奏的")
}
}
/**
* 钢琴
*/
public class Piano extends Spiccato {
public Piano() {
super()
}
public Piano(String song) {
super.musical(song)
System.out.println("这是在用钢琴弹奏 "+song)
}
}
1、注释形式统一在整个应用程序中，使用具有一致的标点和结构的样式来构造注释。如果在其它项目中发现它们的注释规范与这份文档不同，按照这份规范写代码，不要试图在既成的规范系统中引入新的规范。
2、注释内容准确简洁
内容要简单、明了、含义准确，防止注释的多义性，错误的注释不但无益反而有害。
![[R语言] Heatmap绘图经验总结](/aiimages/%5BR%E8%AF%AD%E8%A8%80%5D+Heatmap%E7%BB%98%E5%9B%BE%E7%BB%8F%E9%AA%8C%E6%80%BB%E7%BB%93.png)
