桥接模式（Bridge Pattern）把抽象与具体实现进行解耦，主要针对一个角色有多种分类的情况，可以减少了对实例的依赖，通过桥接和抽象类建立一个关联，特别适合两个独立变化的维度之间的桥接。

一、需求举例：

一个团队的Leader，负责运行团队，团队内有初级工程师，中级工程师和高级工程师。团队的Leader向各级工程师分配任务。

二、类图：

三、代码实例：

1.工程师父接口：Engineer

package com.lance.bridge;

public interface Engineer { 

    default void develop(String program) {
        System.out.println("Engineer default refuse " + program);
    }
}

2.初级工程师类：JuniorEngineer

package com.lance.bridge;

public class JuniorEngineer implements Engineer {

    @Override
    public void develop(String program) {
        System.out.println("Junior Engineer develop " + program);

    }

}

3.中级工程师：IntermediateEngineer

package com.lance.bridge;

public class IntermediateEngineer implements Engineer {

    @Override
    public void develop(String program) {
        System.out.println("Intermediate Engineer develop " + program);
    }
}

4.高级工程师类：SeniorEngineer

package com.lance.bridge;

public class SeniorEngineer implements Engineer {

    @Override
    public void develop(String program) {
        System.out.println("Senior Engineer develop " + program);

    }
}

5.领导父类：Leader

package com.lance.bridge;

public abstract class Leader {

    protected Engineer engineer;

    public Leader(Engineer engineer) {
        this.engineer = engineer;
    }

    public abstract void run(String program);
}

6.团队领导：TeamLeader

package com.lance.bridge;

public class TeamLeader extends Leader {

    public TeamLeader(Engineer engineer) {
        super(engineer);
    }

    @Override
    public void run(String program) {
        engineer.develop(program);
    }
}

7.主类：BridgePattern

package com.lance.bridge;

public class BridgePattern {

    public static void main(String[] args) {


        System.out.println("==========start==========");

        Leader leader = new TeamLeader(new JuniorEngineer());
        leader.run("[easy program]");

        System.out.println("=======================");

        leader = new TeamLeader(new IntermediateEngineer());
        leader.run("[middle program]");

        System.out.println("=======================");

        leader = new TeamLeader(new JuniorEngineer());
        leader.run("[difficult program]");

        System.out.println("==========end==========");

    }
}

输出结果：

==========start==========
Junior Engineer develop [easy program]
=======================
Intermediate Engineer develop [middle program]
=======================
Junior Engineer develop [difficult program]
==========end==========