定义三个教师对象，添加到集合ArryList，遍历输出

好的，以下是一个示例代码，用于定义三个教师对象，添加到 ArrayList 集合中，并进行遍历输出：

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) {
        // 创建 ArrayList 对象
        ArrayList<Teacher> teachers = new ArrayList<>();

        // 定义三个 Teacher 对象
        Teacher teacher1 = new Teacher("张三", 35, "数学");
        Teacher teacher2 = new Teacher("李四", 40, "英语");
        Teacher teacher3 = new Teacher("王五", 30, "物理");

        // 将三个 Teacher 对象添加到 ArrayList 中
        teachers.add(teacher1);
        teachers.add(teacher2);
        teachers.add(teacher3);

        // 遍历 ArrayList，输出每个 Teacher 对象的信息
        for (Teacher teacher : teachers) {
            System.out.println("姓名：" + teacher.getName() + "，年龄：" + teacher.getAge() + "，科目：" + teacher.getSubject());
        }
    }
}

运行以上代码，将会输出以下结果：

姓名：张三，年龄：35，科目：数学
姓名：李四，年龄：40，科目：英语
姓名：王五，年龄：30，科目：物理