写一个课程类: 包括属性:课程名;学时;任课老师; 提供无参的构造方法和一个有参的构造方法 使用有参构造方法创建五个对象:“c语言”,“Java编程”,“php网络编程”,“c++”,“数据结构”

在Java中，我们可以创建一个名为`Course`的类来表示课程，它包含课程名、学时和任课老师等属性。以下是这个类的简单实现：

public class Course {
    private String courseName;
    private int creditHours;
    private String teacher;

    // 无参构造方法
    public Course() {
        this.courseName = "";
        this.creditHours = 0;
        this.teacher = "";
    }

    // 有参构造方法
    public Course(String courseName, int creditHours, String teacher) {
        this.courseName = courseName;
        this.creditHours = creditHours;
        this.teacher = teacher;
    }

    // 提供getter和setter方法
    public String getCourseName() {
        return courseName;
    }

    public void setCourseName(String courseName) {
        this.courseName = courseName;
    }

    public int getCreditHours() {
        return creditHours;
    }

    public void setCreditHours(int creditHours) {
        this.creditHours = creditHours;
    }

    public String getTeacher() {
        return teacher;
    }

    public void setTeacher(String teacher) {
        this.teacher = teacher;
    }

    @Override
    public String toString() {
        return "Course{" +
                "courseName='" + courseName + '\'' +
                ", creditHours=" + creditHours +
                ", teacher='" + teacher + '\'' +
                '}';
    }

    public static void main(String[] args) {
        // 创建五个课程对象
        Course cLanguage = new Course("C语言", 4, "张三");
        Course javaProgramming = new Course("Java编程", 6, "李四");
        Course phpNetworking = new Course("PHP网络编程", 5, "王五");
        Course cPlusPlus = new Course("C++", 7, "赵六");
        Course dataStructures = new Course("数据结构", 8, "钱七");

        // 打印每个课程信息
        System.out.println(cLanguage);
        System.out.println(javaProgramming);
        System.out.println(phpNetworking);
        System.out.println(cPlusPlus);
        System.out.println(dataStructures);
    }
}

在这个例子中，我们定义了一个`Course`类，并提供了两个构造方法，以及基本的属性访问方法。在`main`函数中，我们通过有参构造方法创建了五个`Course`对象并打印它们的信息。