学习笔记——面向对象（继承）

一、学习重点

 

 

 

二、学习内容

 

public class Ch01 {
    public static void main(String[] args) {
        Biology biology=new Biology();
        biology.age=20;
        biology.breath();

        Animal animal=new Animal();
        animal.age=3;
        animal.breath();

        Person person=new Person();
        person.age=30;
        person.name="ll";
        person.eat();
        person.breath();
    }

}


package com.jsoft.morning;

public class Biology {

    Integer age;

    public Biology() {
    }

    public Biology(Integer age) {
        this.age = age;
        System.out.println("生物类的构造器...");
    }

    public void breath(){

    }
}


package com.jsoft.morning;

public class Animal extends Biology {

    String name;

    public Animal() {
    }

    public Animal(Integer age) {
        super(age);
        System.out.println("动物类的构造器...");
    }
    public Animal(Integer age,String name) {
        super(age);
//        this(age);
        this.name = name;
//        this(name);
    }
//    public Animal(String name){
//        this.name = name;
//    }

    public void eat(){
        // 调用父类的属性
        age = 20;
        // 调用父类的方法
        breath();
        // 调用当前类的属性
        name = "z";
        // 调用当前类的方法
//        drank();
    }

    public void drank(String water) {
        System.out.println("动物在喝" + water);
    }

    public String show() {
        return "我们很优秀";
    }

    public Biology info(Biology biology) {

        return null;
    }
}
package com.jsoft.morning;

public class Cat extends Animal {

    public Cat(Integer age) {
        super(age);
    }
}

package com.jsoft.morning;

public class Person extends Animal {
    
    public Person() {
    }

    public Person(Integer age) {
        super(age);
        System.out.println("人类的构造器...");
    }

    public void drank(String water){
        System.out.println("人在喝" + water);
        System.out.println("喝完了" + water + "再来一杯！");
    }

    public String show(){
        // 返回的是我们很优秀，我们很直溜
        return super.show() + "我们很直溜";
    }

    public Animal info(Biology animal){

        return null;
    }

}

package com.jsoft.afternoon;

public class Ch01 {

    private String name;
    private Integer age;

    /*
        this可以代表对象
        super代表不了对象
     */
    public Ch01 info(String name,Integer age) {
//        Ch01 ch01 = new Ch01();
        this.setName(name);
        this.setAge(age);

        show(this);

        return this;
    }

    public void show(Ch01 ch01) {

    }

    public static void main(String[] args) {
        Ch01 ch01 = new Ch01();
        ch01 = ch01.info("abcd", 20);
        System.out.println(ch01.getName() + ch01.getAge());
//        System.out.println(c.getName() + c.getAge());
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public Integer getAge() {
        return age;
    }

    public void setAge(Integer age) {
        this.age = age;
    }


}
package com.jsoft.afternoon;

public class Person {

    private String name;
    private Integer age;

    public String getName() {
        return name;
    }

    public Person setName(String name) {
        this.name = name;

        return this;
    }

    public Integer getAge() {
        return age;
    }

    public Person setAge(Integer age) {
        this.age = age;

        return this;
    }
}
package com.jsoft.afternoon;

public class Ch02 {

    public static void main(String[] args) {
        Person person = new Person();
        // 链式处理
        person.setName("张三").setAge(20);
//        person.setAge(20);
    }
}

 

 

三、笔记内容