适配器模式

class Source {
public void sourceFun(){
System.out.println("this is Source");
}
}

class Target {
public void targetFun(){
System.out.println("this is Target");
}
}

class Adapter extends Source{
private Target target=new Target();
public void sourceFun(){
System.out.println("this is Adapter");
this.target.targetFun();
}
}