GoF Definition:
Decouple an abstraction from its implementation so that the two can vary independently.
概念
把事物对象和其具体行为特征分离开，使其可以独立变化。
例子
在一般的软件公司里，技术支持起到了研发团队和客户之间的桥接作用。
代码实现
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public interface {
void fillWithColor(int border);
}
public class GreenColor implements {
public void fillWithColor(int border) {
System.out.println("Green Color with " + border + " inch border");
}
}
public class RedColor implements {
public void fillWithColor(int border) {
System.out.println("Red color with " + border + " inch border");
}
}
public abstract class Shape {
protected IColor color;
protected Shape(IColor c) {
this.color = c;
}
abstract void drawShape(int border);
abstract void modifyBorder(int border, int increment);
}
public class Rectangle extends Shape {
protected Rectangle(IColor c) {
super(c);
}
void drawShape(int border) {
System.out.println("This Rectangle is colored with: ");
color.fillWithColor(border);
}
void modifyBorder(int border, int increment) {
System.out.println("nNow we are changing the border length " + increment + "times");
border = border * increment;
drawShape(border);
}
}
public class Triangle extends Shape {
protected Triangle(IColor c) {
super(c);
}
void drawShape(int border) {
System.out.println("This Triangle is colored with:");
color.fillWithColor(border);
}
@Override
void modifyBorder(int border, int increment) {
System.out.println("nNow we are changing the border length " + increment + "times");
border = border * increment;
drawShape(border);
}
}
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