Person类
class Person{
private String name;
private String addr;
private char sex;
private int age;
Person(String name,String addr,char sex,int age) {
this.name = name;
this.addr = addr;
this.sex = sex;
this.age = age;
}
Person(String name,String addr){
this.name = name;
this.addr = addr;
}
Person(){}
public void print() {
System.out.println("姓名:"+this.name);
System.out.println("地址:"+this.addr);
System.out.println("性别:"+this.sex);
System.out.println("年龄:"+this.age);
}
}
Student类
class Student extends Person{
int math;
int english;
Student(String name,String addr,char sex,int age,int math,int english){
super(name,addr,sex,age);
this.math = math;
this.english = english;
}
Student(int math,int english){
this.math = math;
this.english = english;
}
Student(){}
@Override
public void print() {
super.print();
System.out.println("数学成绩:"+math);
System.out.println("英语成绩:"+english);
}
}
测试一下
Student stu = new Student("张三","安徽",'男',20,99,87);
stu.print();
2.定义员工类,具有姓名,年龄,性别属性,并具有构造方法和显示数据方法。定义管理层类,继承员工类,并自己的属性职务和年薪。定义职员类,继承员工类,并有自己的属性所属部门和月薪。
1)员工类
class staff{
private String name;
private int age;
private char sex;
public staff(String name,int age,char sex){
this.name = name;
this.age = age;
this.sex = sex;
}
public String getName() {
return this.name;
}
public int getAge() {
return this.age
}
public char getSex() {
return this.sex;
}
public void tell() {
System.out.println("姓名:"+this.name);
System.out.println("年龄:"+this.age);
System.out.println("性别:"+this.sex);
}
}
2)管理层类
class administration extends staff{
private String post;
private double salary;
public administration(String name,int age,char sex,String post,double salary) {
super(name, age, sex);
this.post = post;
this.salary = salary;
}
public String getPost() {
return this.getPost();
}
public double getSalary() {
return this.salary;
}
@Override
public void tell() {
super.tell();
System.out.println("职位:"+this.post);
System.out.println("年薪:"+this.salary);
}
}
3)职员类
class staffMember extends staff{
private String department;
private double salary;
public staffMember(String name,int age,char sex,String department,double salary) {
super(name,age,sex);
this.department = department;
this.salary = salary;
}
public String getDepartment() {
return this.department;
}
public double getSalary() {
return this.salary;
}
@Override
public void tell() {
super.tell();
System.out.println("部门:"+this.getDepartment());
System.out.println("月薪:"+this.getSalary());
}
}
3.编写程序,统计出字符串want you to know one thing中字母n和字母o的出现次数
String str = "want you to know one thing";
char [] arr = str.toCharArray();
int oNum = 0;
int nNum = 0;
for(char element:arr) {
if(element=='o')
oNum++;
else if(element=='n')
nNum++;
}
System.out.println("字母n出现的次数:"+nNum);
System.out.println("字母o出现的次数:"+oNum);
4.建立一个可以实现整型数组的操作类(Array),类中允许操作的数组大小有外部动态指定,同时在Array类里需要提供有数组的以下处理:进行数据的增加(如果数据满了则无法增加),可以实现数组的容量扩充,取得数组的全部内容,完成之后再次基础上派生两个子类。
数组排序类
数组反转类