将「南通渡课 IT 教育 1811 班同学在 3 教室上崔老师的 Java 课」这个场景进行业务类的抽象，类中包含属性和方法：

public class DuKe {

	String school;
	String classes;
	String classroom;
	String teacher;
	String course;

	DuKe(String school, String classes, String classroom, String teacher, String course) {
		this.school = school;
		this.classes = classes;
		this.classroom = classroom;
		this.teacher = teacher;
		this.course = course;
	}

	void bhv() {
		System.out.println(
				this.school + this.classes + "同学在" + this.classroom + "上" + this.teacher + "的" + this.course + "课");
	}

	public static void main(String[] args) {
		DuKe du = new DuKe("南通渡课IT教育", "1811班", "3教室", "崔老师", "Java");
		du.bhv();
	}
}