JAVA，

JAVA，

编写一个学生类Students，该类成员变量包括学号no、姓名name、性别sex和年龄age，该类的成员方法有genNo()getName ).getSex().getAge().和setAge() 添加构造方法为所有成员变量赋初值，构造方法要有4种格式:
(1) 包括no,name,sex 和age四个参数。
(2) 包括 no.name 和sex 三个参数。
(3) 包括no和name两个参数。

(4) 只包括no一个参数。

1、

class Student{
private int no;
private String name;
private String sex;
private int age;
public void setNo(int myNo){
if(myNo <=0||myNo>=999){
System.out.println("学号出错");
no = 0;}
else
no = myNo;
}
public void setSex(String mySex){
sex = mySex;
}
public void setName(String myName){
name = myName;
}
public void setAge(int myAge){
if(myAge <=0){
System.out.println("年龄出错，默认年龄20岁");
age = 20;}
else
age = myAge;
} 
public String getName(){
System.out.println("姓名："+name);
return name;}
public String getSex(){
System.out.println("性别："+sex);
return sex;}
public int getAge(){
System.out.println("年龄："+age);
return age;}
public int getNo(){
System.out.println("学号："+no);
return no;}
}
public class Students {
public static void main(String[] args) {
Student p1 = new Student();
p1.setName("熊悦");
p1.setAge(18);
p1.setSex("男");
p1.setNo(99);
p1.getName();
p1.getAge();
p1.getSex();
p1.getNo();
}
}

2、

class Student{
private int no;
private String name;
private String sex;
private int age;
public void setNo(int myNo){
if(myNo <=0||myNo>=999){
System.out.println("学号出错");
no = 0;}
else
no = myNo;
}
public void setSex(String mySex){
sex = mySex;
}
public void setName(String myName){
name = myName;
}
public void setAge(int myAge){
if(myAge <=0){
System.out.println("年龄出错，默认年龄20岁");
age = 20;}
else
age = myAge;
} 


public String getName(){
System.out.println("姓名："+name);
return name;}
public String getSex(){
System.out.println("性别："+sex);
return sex;}
public int getAge(){
System.out.println("年龄："+age);
return age;}
public int getNo(){
System.out.println("学号："+no);
return no;}
}


public class Students {
public static void main(String[] args) {
Student p1 = new Student();
p1.setName("熊悦");
//p1.setAge(18);
p1.setSex("男");
p1.setNo(99);
p1.getName();
//p1.getAge();
p1.getSex();
p1.getNo();
}
}

3、

class Student{
private int no;
private String name;
private String sex;
private int age;
public void setNo(int myNo){
if(myNo <=0||myNo>=999){
System.out.println("学号出错");
no = 0;}
else
no = myNo;
}
public void setSex(String mySex){
sex = mySex;
}
public void setName(String myName){
name = myName;
}
public void setAge(int myAge){
if(myAge <=0){
System.out.println("年龄出错，默认年龄20岁");
age = 20;}
else
age = myAge;
} 


public String getName(){
System.out.println("姓名："+name);
return name;}
public String getSex(){
System.out.println("性别："+sex);
return sex;}
public int getAge(){
System.out.println("年龄："+age);
return age;}
public int getNo(){
System.out.println("学号："+no);
return no;}
}


public class Students {
public static void main(String[] args) {
Student p1 = new Student();
p1.setName("熊悦");
//p1.setAge(18);
//p1.setSex("男");
p1.setNo(99);
p1.getName();
//p1.getAge();
//p1.getSex();
p1.getNo();
}
}

4、

class Student{
private int no;
private String name;
private String sex;
private int age;
public void setNo(int myNo){
if(myNo <=0||myNo>=999){
System.out.println("学号出错");
no = 0;}
else
no = myNo;
}
public void setSex(String mySex){
sex = mySex;
}
public void setName(String myName){
name = myName;
}
public void setAge(int myAge){
if(myAge <=0){
System.out.println("年龄出错，默认年龄20岁");
age = 20;}
else
age = myAge;
} 


public String getName(){
System.out.println("姓名："+name);
return name;}
public String getSex(){
System.out.println("性别："+sex);
return sex;}
public int getAge(){
System.out.println("年龄："+age);
return age;}
public int getNo(){
System.out.println("学号："+no);
return no;}
}


public class Students {
public static void main(String[] args) {
Student p1 = new Student();
//p1.setName("熊悦");
//p1.setAge(18);
//p1.setSex("男");
p1.setNo(99);
//p1.getName();
//p1.getAge();
//p1.getSex();
p1.getNo();
}
}