13518219792
public class Test{
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private String a;
public Test(){}
public static void main(String[] args){}
}
这是最常见的。
还有很多种。
@Entity
@Table(name = "t_book")
public class Book implements Serializable{
private static final long serialVersionUID = -2738902322135434977L;
@GenericGenerator(name = "generator", strategy = "uuid")
@Id
@GeneratedValue(generator = "generator")
@Column(name = "uuid", unique = true, nullable = false, length = 32)
private String uuid;
@Column(name = "t_type)
private int type;
@Column(name = "t_Name", length =30)
private String name;
@Column(name = "t_Author", length = 30)
private String naAuthor;
自己生成get set 方法
使用Eclipse编写自己的第一个Java代码。
编写如下：
1、首先打开自己安装的Eclipse软件。
2、然后选择File-New-JavaProject。
3、然后找到工程打开，右击src选择-New-Class。
4、填入类名，选择下面的publicstaticvoidmain(String[]args)。
5、然后写入代码publicclassDemo{publicstaticvoidmain(String[]args){//TODOAuto-generatedmethodstubSystem.out.println(HelloWorld)。
6、点击上面的运行按钮，点击确认，可以看到代码运行结果。
创建一个名字为“ReportCard”的类，然后用下边的内容全部替换掉，你会成为全班最亮的仔。
import java.util.HashMap;
/**
* 学生成绩单
*/
public class ReportCard {
public static void main(String[] args) {
ReportCard reportCard = new ReportCard("张三", "070602213");
reportCard.set("语文", 80.0);
reportCard.set("数学", 59.5);
reportCard.set("英语", 66.0);
reportCard.set("java", 80, 99.0);
reportCard.set("数据库", 80, 66.0);
reportCard.set("毛概", null);
System.out.println(reportCard.getStudentName() + "语文分数:" + reportCard.get("语文"));
System.out.println(reportCard.getStudentName() + "数学考核结果:" + (reportCard.isPassed("数学") ? "合格" : "不合格"));
System.out.println(reportCard.getStudentName() + "期末是否挂科：" + (reportCard.isAllPassed() ? "否" : "是"));
}
// 学生姓名
private String studentName;
// 学生学号
private String studentNumber;
// 成绩单
private HashMapString, CourseResult cards = new HashMap();
public ReportCard() {
}
public ReportCard(String studentName, String studentNumber) {
this.studentName = studentName;
this.studentNumber = studentNumber;
}
public Double get(String courseName){
CourseResult courseResult = cards.get(courseName);
return courseResult == null ? Double.NaN : courseResult.getStudentScore();
}
public void set(String courseName, Double studentScore){
CourseResult courseResult = new CourseResult(courseName, studentScore);
cards.put(courseName, courseResult);
}
public void set(String courseName, double passMark, Double studentScore){
CourseResult courseResult = new CourseResult(courseName, passMark, studentScore);
cards.put(courseName, courseResult);
}
public boolean isPassed(String courseName){
return cards.get(courseName).isPassed();
}
public boolean isAllPassed(){
for(CourseResult cr : cards.values()){
if ( ! cr.isPassed()) {
return false;
}
}
return true;
}
public String getStudentName() {
return studentName;
}
public String getStudentNumber() {
return studentNumber;
}
public void setStudentName(String studentName) {
this.studentName = studentName;
}
public void setStudentNumber(String studentNumber) {
this.studentNumber = studentNumber;
}
/**
* 课程
*/
class Course{
// 课程名称
protected String courseName;
// 及格分
protected double passMark = 60;
public Course(String courseName, Double passMark) {
this.courseName = courseName;
if ( passMark != null) {
this.passMark = passMark;
}
}
}
/**
* 课程成绩
*/
class CourseResult extends Course{
// 学生成绩
private Double studentScore;
public CourseResult(String courseName, Double studentScore) {
this(courseName, null, studentScore);
}
public CourseResult(String courseName, Double passMark, Double studentScore) {
super(courseName, passMark);
this.studentScore = studentScore == null ? Double.NaN : studentScore;
}
public boolean isPassed(){
return studentScore = passMark;
}
public String getCourseName() {
return courseName;
}
public double getPassMark() {
return passMark;
}
public Double getStudentScore() {
return studentScore;
}
}
实体类，只要里面包含属性跟方法就可以了，例如public class demo{
private int age;
private String name;
}。这就是一个标准的实体类
不就是建立一个类，定义一些属性，然后给这些属性定义set和get方法吗？查询出数据表中的结果，直接set进去你所说的实体类(bean)中，要用的时候再get取出来就是了
