public class Point {
private int coordinateX;
private int coordinateY;
public Point(int coordinateX, int coordinateY){
this.coordinateX = coordinateX;
this.coordinateY = coordinateY;
}
public String toString(){
return "Point[x=" + coordinateX + ",y=" + coordinateY + "]";
}
public int getCoordinateX() {
return coordinateX;
}
public int getCoordinateY() {
return coordinateY;
}
}
public interface Shape {
public Point getBottomLeftPoint();
public Point getTopRightPoint();
}
public class TextView {
public int getCoordinateX() {
System.out.println("TextView.getCoordinateX()...");
return 10;
}
public int getCoordinateY() {
System.out.println("TextView.getCoordinateY()...");
return 20;
}
public int getHeight() {
System.out.println("TextView.getHeight()...");
return 30;
}
public int getWidth() {
System.out.println("TextView.getWidth()...");
return 40;
}
public boolean isEmpty(){
return false;
}
}
public class TextShape implements Shape {
private TextView textView;
public TextShape(TextView textView){
this.textView = textView;
}
//通過TextView的實例進行協調實現
public Point getBottomLeftPoint() {
System.out.println("TextShape.getBottomLeftPoint()...");
int coordinateX = textView.getCoordinateX();
int coordinateY = textView.getCoordinateY();
return new Point(coordinateX, coordinateY);
}
//通過TextView的實例進行協調實現
public Point getTopRightPoint() {
System.out.println("TextShape.getTopRightPoint()...");
int coordinateX = textView.getCoordinateX();
int coordinateY = textView.getCoordinateY();
int height = textView.getHeight();
int width = textView.getWidth();
return new Point(coordinateX + width, coordinateY + height);
}
}
public class Client {
public static void main(String[] args){
System.out.println("Client.main begin ..........");
System.out.println("Client.main 以下是通過實例委託方式實現的Adapter");
Shape shape = new TextShape(new TextView());
Point bottomLeft = shape.getBottomLeftPoint();
Point topRight = shape.getTopRightPoint();
System.out.println("Client.main shape's bottomLeft:" + bottomLeft);
System.out.println("Client.main shape's topRight:" + topRight);
System.out.println(" Client.main 以下是通過類繼承方式實現的Adapter");
Shape shape2 = new TextShape2();
bottomLeft = shape2.getBottomLeftPoint();
topRight = shape2.getTopRightPoint();
System.out.println("Client.main shape2's bottomLeft:" + bottomLeft);
System.out.println("Client.main shape2's topRight:" + topRight);
System.out.println("Client.main end ..........");
}
}
public class TextShape2 extends TextView implements Shape {
//通過所繼承的TextView,進行協調實現
public Point getBottomLeftPoint() {
System.out.println("TextShape2.getBottomLeftPoint()...");
int coordinateX = getCoordinateX();
int coordinateY = getCoordinateY();
return new Point(coordinateX, coordinateY);
}
//通過所繼承的TextView,進行協調實現
public Point getTopRightPoint() {
System.out.println("TextShape2.getTopRightPoint()...");
int coordinateX = getCoordinateX();
int coordinateY = getCoordinateY();
int height = getHeight();
int width = getWidth();
return new Point(coordinateX + width, coordinateY + height);
}
//注意: 這一點體現了類模式的優勢,可以很方便地重定義父類TextView中的方法
public int getCoordinateX() {
System.out.println("TextShape2.getCoordinateX()...");
return 100;
}
}