定义一个对象student

定义一个学生对象student，包含四个属性：学号、姓名、年龄、性别（属性值自行定义），并且包含一个方法：play，这个方法可以在控制台输出最喜欢玩的游戏。

定义好student对象后，在控制台打印输出此对象的所有属性，最后调用对象中的方法。

package demo; import java.util.Scanner; public class qet { public static int id; public static String name; public static int age; public static String sex; public static String plays; static Scanner input =new Scanner(System.in); public static void main(String[] args) { play(); } public static void play() { System.out.println("请输入学号："); id =input.nextInt(); System.out.println("请输入名字："); name =input.next(); System.out.println("请输入年龄："); age =input.nextInt(); System.out.println("请输入性别："); sex =input.next(); System.out.println("请输入最喜欢的游戏："); plays =input.next(); System.out.print("学员的信息如下："+"\n"+"学号="+id+",名字="+name+",年龄="+age+",性别="+sex+"\n"+"最喜欢的游戏："+plays); } }

先了解一下js构造函数，然后根据想要的方法和属性写就行了

  //对象
      let Student = {
            number: "",
            name: "",
            age: "",
            sex: "",
            play: function () {
                  console.log('我最喜欢玩游戏')
            }
      }
      console.log(Student);
      Student.play();

       //函数对象
      function Student1(number, name, age, sex, game) {
            this.number = number;
            this.name = name;
            this.age = age;
            this.sex = sex;
            this.play = function () {
                  console.log('我最喜欢玩' + game);
            }
      }
      var my = new Student1(1, '威威', 15, '男', '王者');
      console.log(my);
      my.play();

      //class类
      class Parent {
            constructor(number, name, age, sex, game) {
                  this.number = number;
                  this.name = name;
                  this.age = age;
                  this.sex = sex;
                  this.play = function () {
                        console.log('我最喜欢玩' + game);
                  }
            }
      };
      const child = new Parent(1, '威威', 15, '男', '王者');
      console.log(child);
      child.play();

分为ES5.1版本之前和ES6

在ES5.1之前使用的是构造函数+原型的方式

function Student(number, name, age, sex, game) {
	this.number = number;
	this.name = name;
	this.age = age;
	this.sex = sex;
}
Student.prototype.play = function(gameName){
	console.log('我最喜欢玩' + gameName);
}

var student = new Student("007", "张三", 18, "男", "王者");
console.log(student);
student.play();

通常情况下在构建一个类的时候，会将方法写在其原型上

ES6语法

class Student {
	constructor(number, name, age, sex, game) {
		this.number = number;
		this.name = name;
		this.age = age;
		this.sex = sex;
	};
	
	play(gameName){
		console.log('我最喜欢玩' + gameName);
	}
	
};
var student = new Student("007", "张三", 18, "男", "王者");
console.log(student);
student.play();

其中的play方法，通过打印也能够看到是出现在原型中的，只不过通过ES6写出来的，看起来更简洁，更符合学过强类型语言的规则，但是本质上是一样的