請按照以下要求設計一個學生類Student，並進行測試。
要求如下：
1、Student類中包含姓名、成績兩個屬性。
2、分別給這個屬性設置兩個方法，一個方法用於設置值，另一個方法用於獲取值。
3、Student類中定義一個無參的構造方法和一個接收兩個參數的構造方法，兩個參數分別為姓名和成績屬性賦值。
4、在測試類中創建兩個Student對象，一個使用無參的構造方法，然后調用方法給姓名和成績賦值，另一個使用有參的構造方法，在構造方法中給姓名和成績賦值。
法一：
class Student
{
private String name;
private double grade;
public Student(){
}
public Student(String name, double grade)
{
this.name = name;
this.grade = grade;
}
public String getName(){
return name;
}
public void setName(String name){
this.name = name;
}
public double getGrade()
{
return grade;
}
public void setGrade(double grade){
this.grade = grade;
}
}
public class Test00
{
public static void main(String[] args){
Student stu1 = new Student();
stu1.setName("王梅");
stu1.setGrade(100);
Student stu2 = new Student("麗華", 100);
System.out.println("學生"+stu1.getName()+"的成績為"+stu1.getGrade()+"");
System.out.println("學生"+stu2.getName()+"的成績為"+stu2.getGrade()+"");
}
}
法二：
class Student{
private String name;
private double grade;
Student(){}
Student(String name,double grade){
this.name=name;
this.grade=grade;
}
public String getName(){
return name;
}
public void setName(String name){
this.name=name;
}
public double getGrade(){
return grade;
}
public void setGrade(double grade){
this.grade=grade;
}
public void speak(){
System.out.println("學生姓名："+name+"，學生成績："+grade+"！");
}
}
public class Test01{
public static void main(String[] args){
Student p1=new Student();
p1.setName("李華");
p1.setGrade(85.3);
p1.speak();
Student p2=new Student("孫華",92.1);
p2.speak();
}
}
法三：
class Student
{
private String xingming;
private int chengji;
public String getxingming(){
return xingming;
}
public void setxingming(String xingming){
this.xingming=xingming;
}
public int getchengji(){
return chengji;
}
public void setchengji(int chengji){
if(chengji<0){
System.out.println("!!!!!!!!!");
}
else{
this.chengji=chengji;}
}
public Student(){
}
public Student(String xingming,int chengji){
this.xingming=xingming;
this.chengji=chengji;
}
}
public class Test02{
public static void main(String[] args){
Student S1=new Student();
S1.setchengji(222);
S1.setxingming("sunjialei");
Student S2=new Student("mengnan",222);
//String a=S1.getxingming();
System.out.println(S1.getxingming());
System.out.println(S1.getchengji());
System.out.println(S2.getxingming());
System.out.println(S2.getchengji());
}
}
