java multiple inheritance

Java can implement multiple inheritance.
Two ways:
First, the interface, the second is an internal class.

public class Father {
    public int strong(){
        return 9;
    }
}

public class Mother {
    public int kind(){
        return 8;
    }
}

public class Son {
    
    /**
     * 内部类继承Father类
     */
    class Father_1 extends Father{
        public int strong(){
            return super.strong() + 1;
        }
    }
    
    class Mother_1 extends  Mother{
        public int kind(){
            return super.kind() - 2;
        }
    }
    
    public int getStrong(){
        return new Father_1().strong();
    }
    
    public int getKind(){
        return new Mother_1().kind();
    }
}

public class Test1 {

    public static void main(String[] args) {
        Son son = new Son();
        System.out.println("Son 的Strong：" + son.getStrong());
        System.out.println("Son 的kind：" + son.getKind());
    }

}
----------------------------------------
Output:
Son 的Strong：10
Son 的kind：6

Abstract To: blog .