第5章 面向对象（基础篇）

class Address {
private String country;
private String province;
private String city;
private String street;
private String postcode;

Address() {

}

Address(String country, String province, String city, String street, String postcode) {
this.country = country;
this.province = province;
this.city = city;
this.street = street;
this.postcode = postcode;
}

public void show() {
System.out.println("地址为："+country+province+city+street+"    邮编: "+postcode);
}
}
public class AddressTest {

public static void main(String[] args) {
new Address("中国", "湖北省", "天门市", "陆羽大道", "427806").show();
}

}

class Employee {
private String id;
private String name;
private double base_salary;
private double increase_salary;

Employee(String id, String name, double base_salary, double increase_salary) {
this.id = id;
this.name = name;
this.base_salary = base_salary;
this.increase_salary = increase_salary;
}

public double getIncrease_salary() {
return increase_salary;
}

public double getTotalSalary() {
return increase_salary + base_salary;
}

}
public class EmployeeDemo {

public static void main(String[] args) {
Employee li = new Employee("211016040", "李阿昀", 5000, 2500.50);
System.out.println("薪水增长额："+li.getIncrease_salary());
System.out.println("增长后的工资总额为："+li.getTotalSalary());
}

}

public class practice3 {

public static void main(String[] args) {
String str = "want you to know one thing";
System.out.println("字母n出现的次数："+getCharacterCounts(str, 'n'));
System.out.println("字母o出现的次数："+getCharacterCounts(str, 'o'));
}

public static int getCharacterCounts(String str, char ch) {
int count = 0;

for(int index = 0; (index = str.indexOf(ch, index)) != -1; index++) {
count++;
}
return count;
}

}

class Dog {
private String name;
private String color;
private int age;
public Dog(String name, String color, int age) {
this.name = name;
this.color = color;
this.age = age;
}

public void show() {
System.out.println("狗狗的名字是"+name+"，颜色是"+color+",年龄是"+age+"岁。");
}
}
public class DogTest {

public static void main(String[] args) {
new Dog("旺财", "黄色", 5).show();
}

}

class User {
private String name;
private String psw;
private static int count = 0;

User() {
count++;
System.out.println("创建第"+count+"个对象。");
}
User(String name) {
this.name = name;
count++;
System.out.println("创建第"+count+"个对象。");
}
User(String name, String psw) {
this.name = name;
this.psw = psw;
count++;
System.out.println("创建第"+count+"个对象。");
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getPsw() {
return psw;
}
public void setPsw(String psw) {
this.psw = psw;
}

public void show() {
System.out.println("用户名："+name+"，口令："+psw);
}
}
public class UserTest {

public static void main(String[] args) {
new User().show();
new User("叶子").show();
new User("李阿昀", "liayun").show();
}

}

public class StringTest {

public static void main(String[] args) {
getTime("Java 技术学习班 20070326");
replace("MLDN JAVA", "JAVA", "J2EE");
getChar("Java 技术学习班 20070326", 8);
clear_0("Java 技术学习班 20070326", '0');
clear_space("Java 技术学习班 20070326");
getBirthday("429006199210061852");
}
//(1)
public static void getTime(String str) {
int index = str.indexOf('2');
int year = Integer.parseInt(str.substring(index, index + 4));
int month = Integer.parseInt(str.substring(index + 4, index + 6));
int day = Integer.parseInt(str.substring(index + 6));
System.out.println("开班日期："+year+"年"+month+"月"+day+"日");
}
//(2)
public static void replace(String str, String oldStr, String newStr) {
System.out.println("替换之后的字符串为："+str.replaceAll(oldStr, newStr));
}
//(3)
public static void getChar(String str, int index) {
System.out.println("\""+str+"\""+"中第"+index+"个字符为："+str.charAt(index));
}
//(4)
public static void clear_0(String str, char ch) {
str = str.replaceAll("0", "");
System.out.println("\""+str+"\""+"清除所有的0后为："+str);
}
//(5)
public static void clear_space(String str) {
String[] s = str.split(" ");
System.out.print("\""+str+"\""+"清除所有的空格后为：");
for(int x = 0; x < s.length; x++) {
System.out.print(s[x]);
}
System.out.println();
}
//(6)
public static void getBirthday(String birthday) {
int year = Integer.parseInt(birthday.substring(6, 10));
int month = Integer.parseInt(birthday.substring(10, 12));
int day = Integer.parseInt(birthday.substring(12, 14));

System.out.println("身份证号为（"+birthday+"）人的生日为："+year+"年"+month+"月"+day+"日");
}

}

package chapter5;
class Staff {
private String id;
private String name;
private double salary;
private String department;

public Staff(String id) {
this.id = id;
name = "无名氏";
salary = 0;
department = "未定";
}

public Staff(String id, String name) {
this.id = id;
this.name = name;
salary = 1000;
department = "后勤";
}

public Staff(String id, String name, double salary, String department) {
this.id = id;
this.name = name;
this.salary = salary;
this.department = department;
}

public Staff() {

}

public void show() {
System.out.println("员工信息为--->工号："+id+"，姓名："+name+"，薪水："+salary
+"，部门："+department);
}
}
public class StaffTest {

public static void main(String[] args) {
new Staff().show();
new Staff("001").show();
new Staff("002", "李阿昀").show();
new Staff("003", "李子", 25000.5, "研发部").show();
}
}

package chapter5;

public class Account {
private String accontName;
private double balance;

public Account(String accontName, double balance) {
this.accontName = accontName;
this.balance = balance;
}

public double getBalance() {
return balance;
}

}

class Book {
private String title;
private String id;
private double price;
private static int count = 0;//静态数据成员册数

Book(String title, double price) {
this.title = title;
this.id = "00"+(++count);
this.price = price;
}

public String getTitle() {
return title;
}

public void setTitle(String title) {
this.title = title;
}

public String getId() {
return id;
}

public void setId(String id) {
this.id = id;
}

public double getPrice() {
return price;
}

public void setPrice(double price) {
this.price = price;
}

public static int getCount() {
return count;
}

}
public class BookTest {

public static void main(String[] args) {
Book[] books = {new Book("小王子", 34.5),
new Book("西游记", 56.5),
new Book("Thinking In Java", 34.5)};

for(int x = 0; x < books.length; x++) {
System.out.println("编号："+books[x].getId()+"，书名："+books[x].getTitle()+
"价格："+books[x].getPrice());
}
System.out.println("图书的总册数为："+Book.getCount()+"册");
}

}