java 核心技术 第四章 Calendar 测试 与Calendar 的使用EmployeeTest

java 核心技术 第四章内容

题目大意很简单就是打印出日历呗：

先看 代码：

import java.text.DateFormatSymbols;
import java.util.Calendar;
import java.util.GregorianCalendar;

public class CalendarTest {

/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
//程序供能实现日历显示
//问题。日历程序包含很多问题例如那一天是星期几，每个月有多少天有咯GregorianCalendar
//类那么就可以简单了

//新建类的一个对象
GregorianCalendar d = new GregorianCalendar();

//今天是第几天  那个月 其中天要使用 day of month 进行
int today  = d.get(Calendar.DAY_OF_MONTH);
int month  = d.get(Calendar.MONTH);

//设置d to start the day of month
//这个意思不明朗
d.set(Calendar.DAY_OF_MONTH, 1);

//获得这个月的星期几

int weekday = d.get(Calendar.DAY_OF_WEEK);

//get the firstdayof week
int firstDayOfWeek = d.getFirstDayOfWeek();

int intent =  0 ;
while(weekday != firstDayOfWeek)
{
intent ++ ;
d.add(Calendar.DAY_OF_MONTH, -1);
weekday = d.get(Calendar.DAY_OF_WEEK);

}
//print week day  nae
String [] weekdayname = new DateFormatSymbols().getShortWeekdays();
do{
System.out.printf("%4s", weekdayname[weekday]);
d.add(Calendar.DAY_OF_MONTH, 1);
weekday = d.get(Calendar.DAY_OF_WEEK);

}while(weekday != firstDayOfWeek);

System.out.println(" ");

for(int i = 1; i<intent ; i++)
{
System.out.print(" ");
}
d.set(Calendar.DAY_OF_MONTH, 1);
do{
int day = d.get(Calendar.DAY_OF_MONTH);
System.out.printf("%3d", day) ;
if(day == today ) System.out.print("*");
else System.out.print(" ");

d.add(Calendar.DAY_OF_MONTH, 1);
weekday = d.get(Calendar.DAY_OF_WEEK);

if(weekday == firstDayOfWeek) System.out.println();

}while(d.get(Calendar.DAY_OF_MONTH) == month);
if( weekday != firstDayOfWeek) System.out.println();
}

}

下面是EmpolyeeTest.java 代码：

步骤： 新建一个Employee 类，该类中包 含有员工的基本信息，与及对员工的操作函数

在主类中新建一个Employee 类的操作数组对象 分别给对象赋值

对员工进行加薪 ，打印输出 代码要注意的是 for( Employee e : stuff) 这个的应用在c 中没有的

代码：

import java.util.Date;
import java.util.GregorianCalendar;

public class EmployeeTest {

/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
//新建一对象
Employee[] stuff = new  Employee[3];

stuff[0] = new Employee("Harry", 46787, 1985, 4, 13);
stuff[1] = new Employee("Jane", 2454, 1993, 5, 10);
stuff[2] = new Employee("KangKang",99224, 1993,3,31);
//每个人的工资都提高5%

for(Employee e : stuff )
{
e.raiseSalary(5);
}
for(Employee e : stuff)
{
System.out.println("name :" + e.getName()+ "  Salary :" + e.getSalary()+" HireDay :" + e.getHireday());
}

}
}
class Employee
{//新建一个Employee类 这里报含员工所有的参数
public  Employee(String n , double s , int year , int month , int day )
{
name = n ;
salary  = s;
//新建一个日历用来存储员工雇佣的时间
GregorianCalendar calendar  = new GregorianCalendar (year, month-1 , day);
hireday = calendar.getTime();

}
public String getName()
{
return name ;
}
public double getSalary()
{
return salary;
}
public Date getHireday()
{
return hireday;
}

public void raiseSalary(double byPercent)
{
double raise = salary* byPercent/100;
salary += raise ;
}
private  String name;
private  double salary;
private Date hireday;
}

运行结果如下：

name :Harry  Salary :49126.35 HireDay :Sat Apr 13 00:00:00 CST 1985
name :Jane  Salary :2576.7 HireDay :Mon May 10 00:00:00 CST 1993
name :KangKang  Salary :104185.2 HireDay :Wed Mar 31 00:00:00 CST 1993