构造函数，方法，方法的调用

package com.jredu.ch06;

public class Students {
    
    //构造函数
    float java;
    float c;
    float db;
    public Students(float java, float c, float db) {
        this.java = java;
        this.c = c;
        this.db = db;
    }
}

package com.jredu.ch06;

public class StudentsBiz {
    //定义方法
    public float getAvg(Students students){
        float avg = (students.c+students.db+students.java)/3;
        return avg;
    }
}

package com.jredu.ch06;

public class StudentsBizTese {

    public static void main(String[] args) {
        Students students = new Students(90,85,95);    //创建Students类对象students并赋值
        StudentsBiz studentsBiz = new StudentsBiz();    //创建StudentsBiz类对象studentsBiz
        //用对象studentsBiz调用getAvg方法赋值调用students类的值
        float avg = studentsBiz.getAvg(students);    
        System.out.println("平均分为:"+avg);
    }

}