详解Java面向对象中的继承

//extends 单继承
public class A{......}
public class B extends A{......}
//extends 多重继承
public class A{......}
public class B extends A{......}
public class C extends B{......}
//extends 不同类继承同一个类
public class B extends  A{......}
public class C extends A{......}
//implements 多继承
public interface A {......}
public interface B {......} 
public class C implements A,B {......}

class 父类 {
}
class 子类 extends 父类 {
}

// 父类 Animal
class Animal{
    String name;
    public void setName(String name) {
        this.name = name;
    }
    public void eat() {
        System.out.println(name + "正在吃");
    }
}
// 子类 Dog 继承自 Animal
class Dog extends Animal {
    public void bark() {
        System.out.println(name + "正在叫");
    }
}
public class Test {
    public static void main(String args[]) {
        Dog dog = new Dog();
        dog.setName("旺财"); // 设置狗的名字为旺财
        dog.eat(); // 继承自父类 Animal，输出：旺财正在吃
        dog.bark(); // 子类添加的方法，输出：旺财正在叫
    }
}