java学习中继承的注意事项

java中类只支持单继承，不支持多继承

java类支持多层继承

package com.ithema_25;

public class Father extends Granddad {

    public void smoke() {
        System.out.println("爸爸爱抽烟");
    }
}

package com.ithema_25;

public class Granddad {

    public void drink(){
        System.out.println("爷爷爱喝酒");
    }
}

package com.ithema_25;

public class Mother {

    public void dance(){
        System.out.println("妈妈爱跳舞");
    }
}

package com.ithema_25;

/*
public class Son extends Father,Mother{
}
 */
public class Son  extends Father{
}