构造器内部的多态方法的行为[Java编程思想]
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2022-06-07 21:24:39
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class Glyph { void draw() { print("Glyph.draw()"); } Glyph() { print("Glyph() before draw()"); draw(); print("Glyph() after draw()"); } } class RoundGlyph extends Glyph { private int radius = 1; RoundGlyph(int r) { radius = r; print("RoundGlyph.RoundGlyph(), radius = " + radius); } void draw() { print("RoundGlyph.draw(), radius = " + radius); } } public class PolyConstructors { public static void main(String[] args) { new RoundGlyph(5); } } //output: //Glyph() before draw() //RoundGlyph.RoundGlyph(), radius = 0 //Glyph() after draw() //RoundGlyph.draw(), radius = 5
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