使用继承的适配器（类适配器）

package xin.jiangqiang.adapter;

public interface Print{
    void printWeak();

    void printStrong();
}

package xin.jiangqiang.adapter;

public class Banner {
    private String string;

    public Banner(String string) {
        this.string = string;
    }
    public void showWithParen() {
        System.out.println("(" + string + ")");
    }
    public void showWithAster() {
        System.out.println("*" + string + "*");
    }
}

package xin.jiangqiang.adapter;

public class PrintBanner extends Banner implements Print {

    public PrintBanner(String s) {
        super(s);
    }

    @Override
    public void printWeak() {
        showWithParen();
    }

    @Override
    public void printStrong() {
        showWithAster();
    }
}

package xin.jiangqiang.adapter;

public class Main {
    public static void main(String[] args) {
        Print p = new PrintBanner("Hello");
        p.printWeak();
        p.printStrong();
    }
}

使用委托的适配器（对象适配器）

package xin.jiangqiang.adapter;

public abstract class Print2 {
    public abstract void printWeak();

    public abstract void printStrong();
}

package xin.jiangqiang.adapter;

public class PrintBanner2 extends Print2 {
    private Banner banner;

    public PrintBanner2(String string) {
        this.banner = new Banner(string);
    }

    @Override
    public void printWeak() {
        banner.showWithParen();
    }

    @Override
    public void printStrong() {
        banner.showWithAster();
    }
}

package xin.jiangqiang.adapter;

public class Main {
    public static void main(String[] args) {
        Print2 p = new PrintBanner2("Hello");
        p.printWeak();
        p.printStrong();
    }
}