05_10Java笔记

05_10

构造方法：是一种特殊的方法。

主要功能是用来在创建对象时初始化对象，即为对象成员变量赋初始值

构造方法必须与类名相同，在方法名前面不声明方法类型，可以重载多个不同的构造方法

快捷键： alt + shift + s  选择generate constructor using fields

publicclass carcar {

  publicstaticvoid main(String[] args) {

    // TODOAuto-generated method stub

    Car1 c1 = new Car1(20,"红色");

    Car1 c2 = new Car1("黑色","保时捷");

    //c1.run(c2);

    c2.run(c1);

  }

}

class Car1{

  inthight;

  String color,pinp;

  public Car1() {}

  public Car1(inthight,String color) {

    this.hight = hight;

    this.color = color;

  }

  public Car1(String color,String pinp) {

    this.color = color;

    this.pinp = pinp;

  }

  publicvoid run(Car1 car) {

    System.out.println("一个"+this.color+"高度"+ car.hight+"品牌"+ this.pinp+"的车在开");

  }

}

运行结果：一个黑色高度20品牌保时捷的车在开

 

 

publicclass Ex_a {

  publicstaticvoid main(String[] args) {

    // TODOAuto-generated method stub

    wide an1 = new wide("兔子","草",5);

    wide an2 = new wide();

    wide an3 = new wide(an1,an2);

    an2.all(an3);

  }

}

class wide{

  String name;

  String eat;

  intweight;

  public wide() {

    this.name = name;

    this.eat = "猪蹄";

    this.weight = 12;

  }

  public wide(wide a,wide b) {

    this.name = b.name;

    this.eat = a.eat;

    this.weight = b.weight;

   

  }

  public wide(String name,String eat,intweight) {

    this.name = name;

    this.eat = eat;

    this.weight = weight;

  }

  public wide(String name,intweight) {

    this.name = name;

    this.weight = weight;

  }

  publicvoid eat1() {

    System.out.println("这个动物喜欢吃" + this.eat);

  }

  publicvoid run() {

    System.out.println("这个动物会跑");

  }

  publicvoid all(wide an) {

    System.out.println("这是一只 " + this.name + "，它喜欢吃 " + an.eat + ",它重 " + an.weight +" 斤");

  }

}

运行结果：这是一只 null，它喜欢吃草,它重 12 斤