feat(class15): 对象传参，数据业务分离

- 新增 Student 类，用于封装学生信息（姓名、语文成绩、数学成绩）
- 新增 StudentOperator 类，用于操作学生对象（计算总成绩和平均成绩）- 新增 Test 类，用于测试 Student 和 StudentOperator 类的功能

src/class15/javabean/Student.java

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+package class15.javabean;
+
+public class Student {
+    private String name;
+    private double chinese;
+    private double math;
+
+    // 无参构造器
+
+    public Student() {
+    }
+
+    //提供一个有参构造器
+
+    public Student(String name, double chinese, double math) {
+        this.name = name;
+        this.chinese = chinese;
+        this.math = math;
+    }
+
+
+    //提供公开的getter和setter方法
+
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public double getChinese() {
+        return chinese;
+    }
+
+    public void setChinese(double chinese) {
+        this.chinese = chinese;
+    }
+
+    public double getMath() {
+        return math;
+    }
+
+    public void setMath(double math) {
+        this.math = math;
+    }
+}

src/class15/javabean/StudentOperator.java

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+package class15.javabean;
+
+public class StudentOperator {
+    private final Student s;
+    public StudentOperator(Student s){
+        this.s = s;
+    }
+//    打印学生对象的总成绩
+    public void printTotalScore(){
+        System.out.println(s.getName()+"的总成绩是：" +  (s.getChinese()+s.getMath()));
+    }
+    public void printAverageScore(){
+        System.out.println(s.getName()+"的平均成绩是：" + (s.getChinese()+s.getMath())/2);
+    }
+}

src/class15/javabean/Test.java

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+package class15.javabean;
+
+public class Test {
+
+    public static void main(String[] args) {
+        Student s = new Student();
+        s.setName("波妞");
+        s.setChinese(100);
+        s.setMath(100);
+        System.out.println(s.getName() + "总成绩是："+(s.getChinese() + s.getMath()));
+
+        Student s1 = new Student("小王", 100, 100);
+        System.out.println(s1.getName() + "总成绩是："+(s1.getChinese() + s1.getMath()));
+
+        StudentOperator operator = new StudentOperator(s1);
+        operator.printTotalScore();
+        operator.printAverageScore();
+
+    }
+}