JAVA中的继承

继承

主函数

package heima;

public class Demo {
    public static void main(String[] args) {
        fu f=new fu();
        f.show();
        zi z=new zi();
        z.method();
        z.show();
    }

}

子类//子类不仅有自己的特点还继承了父类的特点

package heima;

public class zi extends fu{
    public void method(){
        System.out.println("method被调用");
    }


}

父类

package heima;

public class fu {
    public void show(){
        System.out.println("show方法被调用");
    }
}

super

//super调用父类的方法

主函数

package heima;

public class Demo {
    public static void main(String[] args) {
zi z=new zi();
        z.show();
    }

}

父类

package heima;

public class Demo {
    public static void main(String[] args) {
zi z=new zi();
        z.show();
    }

}

子类

package heima;

public class Demo {
    public static void main(String[] args) {
zi z=new zi();
        z.show();
    }

}

package heima;

public class Demo {
    public static void main(String[] args) {
zi z=new zi();
zi z2=new zi(11);
    }

}

package heima;


    public class fu {
        public fu(){
            System.out.println("fu中无参构造被调用");
        }
        public fu(int age){
            System.out.println("fu中有参构造被调用");
        }
    }

package heima;


    public class zi extends fu{
        public zi(){
            //super();//写不写都一样
            super(22);
            System.out.println("Zi中无参构造方法被调用");

        }
        public zi(int age){
            //super();写不写都一样
            super(11);
            System.out.println("Zi中带参构造方法被调用");
        }
    }