?? shapes.java
字號:
interface Shape {
void draw() ;
void erase() ;
}
class Circle implements Shape {
public void draw() {
System.out.println("Circle.draw()");
}
public void erase() {
System.out.println("Circle.erase()");
}
}
class Square implements Shape {
public void draw() {
System.out.println("Square.draw()");
}
public void erase() {
System.out.println("Square.erase()");
}
}
class Triangle implements Shape {
public void draw() {
System.out.println("Triangle.draw()");
}
public void erase() {
System.out.println("Triangle.erase()");
}
}
public class Shapes {
public static Shape randShape() {
switch((int)(Math.random() * 3)) {
default:
case 0: return new Circle();
case 1: return new Square();
case 2: return new Triangle();
}
}
public static void main(String[] args) {
Shape[] s = new Shape[9];
for(int i = 0; i < s.length; i++)
s[i] = randShape();
for(int i = 0; i < s.length; i++)
s[i].draw();
}
}
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