music1.java

来自「翁剀JAVA语言那门课程的教案 很多人都看多他的视频教程可惜没有ppt的教案」· Java 代码 · 共 33 行

//: Music1.java
// Overloading instead of upcasting

class Note1 {
	private int value;
	private Note1(int val) { value = val; };
	public static final Note1
		middleC = new Note1(0),
		cSharp = new Note1(1),
		cFlat = new Note1(2);
}

class Instruments1 {
	public void play(Note1 n) {
		System.out.println("Instrument1.play()");
	}
}

class Wind1 extends Instruments1 {
	public void play(Note1 n) {
		System.out.println("Wind1.play()");
	}
}

public class Music1 {
	public static void tune(Wind1 i) {
		i.play(Note1.middleC);
	}
	public static void main(String[] args) {
		Wind1 flute = new Wind1();
		tune(flute);
	}
}