定义一个Teacher类，有姓名和学科2个属性，之后创建3个teacher对象并赋值，然后存入集合中，用曾强for遍历集合，控制台打印每个老师的信息

好的，这是一个简单的Java编程题目。下面是代码实现：

import java.util.ArrayList;

class Teacher {
    private String name;
    private String subject;

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

    public String getName() {
        return name;
    }

    public String getSubject() {
        return subject;
    }

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

    public void setSubject(String subject) {
        this.subject = subject;
    }
}

public class Main {
    public static void main(String[] args) {
        ArrayList<Teacher> teachers = new ArrayList<>();
        Teacher teacher1 = new Teacher("张三", "数学");
        Teacher teacher2 = new Teacher("李四", "英语");
        Teacher teacher3 = new Teacher("王五", "物理");
        teachers.add(teacher1);
        teachers.add(teacher2);
        teachers.add(teacher3);
        for (Teacher teacher : teachers) {
            System.out.println("姓名：" + teacher.getName() + "，学科：" + teacher.getSubject());
        }
    }
}

输出结果如下：

姓名：张三，学科：数学
姓名：李四，学科：英语
姓名：王五，学科：物理