class student{ private String id; private String name; private int MyDate; private int age; public String getId() {return id; } public String getName() { return name; } public String getMyDate() { return MyDate; } public int getAge() { return age; } void setAge(int age) { this.age = age; } void setAge(int MyDate) { this.MyDate = MyDate; }
}
public class TestStudent { public static void main(String args[]) { student stu = new student("0401398", "廖小明", "2008 9 1",20); System.out.println("student info: " + "\n学号:"+stu.getId()+ "\n姓名"+ stu.getName()+"\n性别:"+stu.getMyDate()+ "\n年龄:"+stu.getAge()); stu.setAge(19);stu.setMyDate(2008 9 1);
System.out.println("修改后的年龄为:"+stu.getAge()); } }
MyDate是入学日期
}
public class TestStudent { public static void main(String args[]) { student stu = new student("0401398", "廖小明", "2008 9 1",20); System.out.println("student info: " + "\n学号:"+stu.getId()+ "\n姓名"+ stu.getName()+"\n性别:"+stu.getMyDate()+ "\n年龄:"+stu.getAge()); stu.setAge(19);stu.setMyDate(2008 9 1);
System.out.println("修改后的年龄为:"+stu.getAge()); } }
MyDate是入学日期
public Student(String id, String name, int MyDate, int age) {
this.id = id;
this.name = name;
this.MyDate = MyDate;
this.age = age;
} public String getId() {
return id;
} public String getName() {
return name;
} public int getMyDate()//返回类型要一致 {
return MyDate;
} public int getAge() {
return age;
} void setAge(int age) {
this.age = age;
} void setMyDate(int MyDate)//相同方法出现两次 {
this.MyDate = MyDate;
}}public class TestStudent{
public static void main(String args[]) { Student stu = new Student("0401398", "廖小明", 200891,20); System.out.println("student info: " + "\n学号:"+stu.getId()+ "\n姓名:"+ stu.getName()+"\n出生日期:"+stu.getMyDate()+ "\n年龄:"+stu.getAge()); stu.setAge(19);
stu.setMyDate(200891);
System.out.println("修改后的年龄为:"+stu.getAge()); }}出生日期有Date类型不要用int型
你的setXXX()方法和getXXX()方法与属性是否对应。你有两个setAge(int age)方法,
缺少setId(),getId(),setName(),getName()
第二个问题
你在TestStudent类中有new来实例化Student类,但是没有相应的构造方法
第三个问题
你的属性的类型不统一
你在类定义时,MyDate属性类型为int类型,但在下面实例化时,你缺却用String类型
import java.util.*;class mystudent{ private String id; private String name; private Date MyDate; private int age;
public mystudent(String id,String name,Date dt,int age){
this.id=id;
this.name=name;
this.age=age;
this.MyDate=dt;
}
public String getId()
{
return id;
} public String getName() { return name; } public Date getMyDate()
{
return MyDate;
} public int getAge() { return age; } void setAge(int age) { this.age = age; } void setMyDate(Date MyDate) { this.MyDate = MyDate; }
}
public class test {
public static void main(String args[])
{
//Date dt=new Date();
mystudent stu = new mystudent("0401398", "廖小明", new Date(2008,9,1),20);System.out.println("student info: " + "\n学号:"+stu.getId()+ "\n姓名"+stu.getName()+"\n性别:"+stu.getMyDate()+ "\n年龄:"+stu.getAge());
stu.setAge(19);
stu.setMyDate(new Date(2008,9,1));
System.out.println("修改后的年龄为:"+stu.getAge()); } }
不过楼主的情况最好还是写成标准的javaBean,无参构造函数加setter和getter方法即可。
note:recompile with -Xlint:deprecation for details.是什么意思??不懂
public student(String id , String name , String MyDate , int age){
this.id = id;
this.name = name;
this.MyDate = MyDate ;
this.age = age;
} public String getId() {return id; } public String getName() { return name; } public String getMyDate() { return MyDate; } public int getAge() { return age; } void setAge(int age) { this.age = age; } void setMyDate(String MyDate) { this.MyDate = MyDate; }
}
public class TestStudent {
public static void main(String args[]) {
student stu = new student("0401398", "廖小明", "2008 9 1",20); System.out.println("student info: " + "\n学号:"+stu.getId()+ "\n姓名"+ stu.getName()+"\n性别:"+stu.getMyDate()+ "\n年龄:"+stu.getAge()); stu.setAge(19);stu.setMyDate("2008 9 1");
System.out.println("修改后的年龄为:"+stu.getAge()); } }
ok!