3.编写Teacher01类，要求如下： (1)2个属性：所在学校(school)、姓名(name) (2)封装所有属性，且所有属性可读可写 (3)编写测试类TestTeacher01，展示封装后各属性的读写方法的使用 4.编写Teacher02类，要求如下： (1)2个属性：所在学校(school)、姓名(name)、年龄(age) (2)封装所有属性，且学校为只写属性，年龄只能接收18-30之间的值 (3)编写测试类TestTeacher02，展示封装后各属性的读写方法的使用 5.编写Teacher03类，要求如下： (1)2个属性：所在学校(school)、姓名(name)、年龄(age) (2)封装所有属性，且学校为只读属性，年龄只能接收18-30之间的值 (3)编写测试类TestTeacher03，展示封装后各属性的读写方法的使用

3. 实现Teacher01类：

public class Teacher01 {
    private String school;
    private String name;

    public String getSchool() {
        return school;
    }

    public void setSchool(String school) {
        this.school = school;
    }

    public String getName() {
        return name;
    }

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

测试类TestTeacher01：

public class TestTeacher01 {
    public static void main(String[] args) {
        Teacher01 teacher = new Teacher01();
        teacher.setName("张三");
        teacher.setSchool("清华大学");
        System.out.println("姓名：" + teacher.getName());
        System.out.println("学校：" + teacher.getSchool());
    }
}

4. 实现Teacher02类：

public class Teacher02 {
    private String school;
    private String name;
    private int age;

    public String getSchool() {
        return school;
    }

    public void setSchool(String school) {
        this.school = school;
    }

    public String getName() {
        return name;
    }

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

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        if (age >= 18 && age <= 30) {
            this.age = age;
        } else {
            System.out.println("年龄必须在18岁到30岁之间！");
        }
    }
}

测试类TestTeacher02：

public class TestTeacher02 {
    public static void main(String[] args) {
        Teacher02 teacher = new Teacher02();
        teacher.setName("李四");
        teacher.setSchool("北京大学");
        teacher.setAge(20);
        System.out.println("姓名：" + teacher.getName());
        System.out.println("学校：" + teacher.getSchool());
        System.out.println("年龄：" + teacher.getAge());
    }
}

5. 实现Teacher03类：

public class Teacher03 {
    private final String school;
    private String name;
    private int age;

    public Teacher03(String school) {
        this.school = school;
    }

    public String getSchool() {
        return school;
    }

    public String getName() {
        return name;
    }

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

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        if (age >= 18 && age <= 30) {
            this.age = age;
        } else {
            System.out.println("年龄必须在18岁到30岁之间！");
        }
    }
}

测试类TestTeacher03：

public class TestTeacher03 {
    public static void main(String[] args) {
        Teacher03 teacher = new Teacher03("上海交通大学");
        teacher.setName("王五");
        teacher.setAge(25);
        System.out.println("姓名：" + teacher.getName());
        System.out.println("学校：" + teacher.getSchool());
        System.out.println("年龄：" + teacher.getAge());
    }
}