9. 编写一个教师类Teacher，要求： （1） 教师类Teacher属性有： Name:String类对象，代表姓名 Age:int型，代表年龄 Sex:boolen型，代表性别（其中：true代表男，false代表女） Phone:long型，代表联系电话

要编写一个名为`Teacher`的Java类，你可以按照以下结构定义：

public class Teacher {
    private String name;
    private int age;
    private boolean sex;
    private long phone;

    // 构造器
    public Teacher(String name, int age, boolean sex, long phone) {
        this.name = name;
        this.age = age;
        this.sex = sex;
        this.phone = phone;
    }

    // getter and setter methods for accessing the properties
    public String getName() {
        return name;
    }

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

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }

    public boolean isSex() {
        return sex;
    }

    public void setSex(boolean sex) {
        this.sex = sex;
    }

    public long getPhone() {
        return phone;
    }

    public void setPhone(long phone) {
        this.phone = phone;
    }

    // Overriding default toString method to provide a string representation of the Teacher object
    @Override
    public String toString() {
        return "Teacher{" +
                "name='" + name + '\'' +
                ", age=" + age +
                ", sex=" + (sex ? "male" : "female") +
                ", phone=" + phone +
                '}';
    }
}

在这个类中，我们定义了四个私有的实例变量来存储教师的姓名、年龄、性别和电话号码。构造函数用于初始化这些属性。getter和setter方法用于访问和修改这些属性。`toString()`方法被重写，以便于打印教师对象的内容。