什么是桥接模式,用java作为例子
时间: 2024-03-27 12:17:22 浏览: 21
桥接模式是一种结构型设计模式,它将抽象部分和实现部分分离,使它们可以独立地变化。
在桥接模式中,抽象部分通常由一个抽象类或接口表示,它定义了客户端需要的所有方法。实现部分由一个或多个具体类表示,它们实现了抽象类或接口中定义的方法。
通过桥接模式,我们可以轻松地扩展抽象部分或实现部分,而不必修改彼此之间的接口或实现。这使得桥接模式在处理复杂的继承结构或多层次继承结构时非常有用。
以下是一个使用Java实现的桥接模式的例子:
抽象类Shape:
```java
public abstract class Shape {
protected Color color;
public Shape(Color color) {
this.color = color;
}
public abstract void draw();
}
```
具体类Circle:
```java
public class Circle extends Shape {
private int x, y, radius;
public Circle(int x, int y, int radius, Color color) {
super(color);
this.x = x;
this.y = y;
this.radius = radius;
}
public void draw() {
System.out.println("Drawing a circle at (" + x + ", " + y + ") with radius " + radius + " in color " + color.getName());
}
}
```
具体类Rectangle:
```java
public class Rectangle extends Shape {
private int x, y, width, height;
public Rectangle(int x, int y, int width, int height, Color color) {
super(color);
this.x = x;
this.y = y;
this.width = width;
this.height = height;
}
public void draw() {
System.out.println("Drawing a rectangle at (" + x + ", " + y + ") with width " + width + " and height " + height + " in color " + color.getName());
}
}
```
抽象类Color:
```java
public abstract class Color {
protected String name;
public Color(String name) {
this.name = name;
}
public String getName() {
return name;
}
}
```
具体类RedColor:
```java
public class RedColor extends Color {
public RedColor() {
super("red");
}
}
```
具体类GreenColor:
```java
public class GreenColor extends Color {
public GreenColor() {
super("green");
}
}
```
客户端代码:
```java
public class Client {
public static void main(String[] args) {
Shape circle = new Circle(10, 10, 5, new RedColor());
Shape rectangle = new Rectangle(20, 20, 5, 10, new GreenColor());
circle.draw();
rectangle.draw();
}
}
```
输出结果:
```
Drawing a circle at (10, 10) with radius 5 in color red
Drawing a rectangle at (20, 20) with width 5 and height 10 in color green
```
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