main.java

用java写的面向对象应用的一个实例 运用了适配器模式 链表中的每一个元素都能调用同一个draw方法画图 画不同的圆形 方形 三角形

package package1;

import java.util.*;

public class Main {
	public static void main(String args[]){
	System.out.println("Input a Integer to choose one graphic\n"+
			"1----->Circle\n"+
			"2----->Triangle\n"+
			"3----->Rectangle");
	List<Node> list=new ArrayList<Node>();
	Scanner scan=new Scanner(System.in);
	while(scan.hasNextInt()){
		int i=scan.nextInt();
		if(i==1||i==2||i==3)
		list.add(ToObject(i));
	}
	ShowList(list);
	}

	private static void ShowList(List<Node> list) {
		// TODO Auto-generated method stub
		for(Node i:list){
			i.draw();
		}
		
	}

	private static Node ToObject(int i) {
		// TODO Auto-generated method stub
	switch (i){
	case 1:{return new CircleNode();}
	case 2:{return new TriangleNode();}
	case 3:{return new RectangleNode();}
		}
	return null;
	}

}