定义一个教师类，要求一：定义三个教师对象，添加到集合ArrayList，遍历输出

以下是定义教师类并添加到ArrayList并遍历输出的示例代码：

import java.util.ArrayList;

public class Teacher {
    private String name;
    private int age;
    private String subject;

    public Teacher(String name, int age, String subject) {
        this.name = name;
        this.age = age;
        this.subject = subject;
    }

    public String getName() {
        return name;
    }

    public int getAge() {
        return age;
    }

    public String getSubject() {
        return subject;
    }

    public static void main(String[] args) {
        ArrayList<Teacher> teacherList = new ArrayList<>();

        // 创建三个教师对象并添加到ArrayList
        Teacher teacher1 = new Teacher("张三", 30, "数学");
        Teacher teacher2 = new Teacher("李四", 35, "英语");
        Teacher teacher3 = new Teacher("王五", 40, "物理");
        teacherList.add(teacher1);
        teacherList.add(teacher2);
        teacherList.add(teacher3);

        // 遍历输出ArrayList中的教师对象
        for (Teacher teacher : teacherList) {
            System.out.println("教师姓名：" + teacher.getName() + "，教师年龄：" + teacher.getAge() + "，教授学科：" + teacher.getSubject());
        }
    }
}

运行结果：

教师姓名：张三，教师年龄：30，教授学科：数学
教师姓名：李四，教师年龄：35，教授学科：英语
教师姓名：王五，教师年龄：40，教授学科：物理