就是将一个类的接口转换为客户期望的另一格接口,就是实现两个接口不兼容类的无缝对接.
类似生活中的 电源转换器功能;
举个简单例子：
public interface Duck {
       public void quack();
       public void fly();
}
 
public interface Turkey {
       public void gobble();
       public void fly();
}
public class WildTurkey implements Turkey {
       public void gobble() {
              System.out.println("Gobble gobble");
       }
 
       public void fly() {
              System.out.println("I'm flying a short distance");
       }
}
现在用 Turkey 来伪装 Duck
public class DuckAdapter implements Turkey {
       Duck duck;
       Random rand;
 
       public DuckAdapter(Duck duck) {
              this.duck = duck;
              rand = new Random();
       }
   
       public void gobble() {
              duck.quack();
       }
 
       public void fly() {
              if (rand.nextInt(5) == 0) {
                   duck.fly();
              }
       }
}
 
public class MallardDuck implements Duck {
       public void quack() {
              System.out.println("Quack");
       }
 
       public void fly() {
              System.out.println("I'm flying");
       }
}
 
public class DuckTestDrive {
       public static void main(String[] args) {
              MallardDuck duck = new MallardDuck();
 
              WildTurkey turkey = new WildTurkey();
              Duck turkeyAdapter = new TurkeyAdapter(turkey);
  
              System.out.println("The Turkey says...");
              turkey.gobble();
              turkey.fly();
 
       }