初入java编程-面向对象

创建一个对象实体类：

package test;

public class StudentClass {
    //此类StudentClass的属性
    private int stu_id;
    private String stu_name;
    
    //无参构造方法
    public StudentClass() {
        super();
    }
    //有参构造方法
    public StudentClass(int stu_id, String stu_name) {
        super();
        this.stu_id = stu_id;
        this.stu_name = stu_name;
    }
    //属性的setter和getter方法，用来给对象StudentClass赋值
    public int getStu_id() {
        return stu_id;
    }
    public void setStu_id(int stu_id) {
        this.stu_id = stu_id;
    }
    public String getStu_name() {
        return stu_name;
    }
    public void setStu_name(String stu_name) {
        this.stu_name = stu_name;
    }
    
    @Override  //override ：子类(StudentClass) 重写父类(Object)的方法，
    public String toString() {
        return "StudentClass [stu_id=" + stu_id + ", stu_name=" + stu_name + "]";
    }
    

}

下一步建立一个main方法测试：

package test;
/**
 * 学生类-测试
 * @author Drew
 *
 */
public class TestStudentClass {
    
    public static void main(String[] args) {
        //创建一个实体对象
        StudentClass studentClass = new StudentClass(21, "SuperDrew");
        //调用学生类的方法toString()
        System.out.println(studentClass.toString());
    }

}

 测试结果：