2、 定义一个Teacher类,包含姓名,性别,定义它的带2个参数的构造方法和get及set方法,并重写toSting方法用于输出姓名和性别。使用List接口创建集合对象用于保存5位教师信息(向集合中添加元素),显示所有性别为“

在Java中，可以这样定义一个Teacher类：

public class Teacher {
    private String name;
    private String gender;

    public Teacher(String name, String gender) {
        this.name = name;
        this.gender = gender;
    }

    public String getName() {
        return name;
    }

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

    public String getGender() {
        return gender;
    }

    public void setGender(String gender) {
        this.gender = gender;
    }

    @Override
    public String toString() {
        return "Name: " + name + ", Gender: " + gender;
    }
}

然后，使用List接口创建集合对象，并向集合中添加元素：

List<Teacher> teacherList = new ArrayList<>();
teacherList.add(new Teacher("张三", "男"));
teacherList.add(new Teacher("李四", "女"));
teacherList.add(new Teacher("王五", "男"));
teacherList.add(new Teacher("赵六", "女"));
teacherList.add(new Teacher("钱七", "男"));

最后，显示所有性别为“女”的教师信息：

for (Teacher teacher : teacherList) {
    if (teacher.getGender().equals("女")) {
        System.out.println(teacher);
    }
}