java定义一个学生类要求学号，姓名，年龄，三个成员变量

class Student{
private int STU_NUM;
private String STU_NAME;
private int STU_AGE;
public Student(int NUM,String NAME){
this.STU_NAME=NAME;
this.STU_NUM=NUM;
}
public Student(int NUM,String NAME,int AGE){
this.STU_NAME=NAME;
this.STU_NUM=NUM;
this.STU_AGE=AGE;
}
}

public class Student{
public int Sno; //学号
public String Sname; //Student Name;
public int Sage; //年龄
public Student(){
} //无参构造器

public Student(int Sno,String Sname, int Sage){
this.Sno=Sno;
this.Sname=Sname;
this.Sage=Sage;

}

}
如果要封装, 将属性改为 private 的话 继续追问

public class Student {
private String number;
private int age;
private String name;
Student(String number,String name){
this.number = number;
this.name = name;
}
Student(String number,String name,int age){
this.number = number;
this.name = name;
this.age = age;
}
public String getNumber() {
return number;
}
public void setNumber(String number) {
this.number = number;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
}