PrintWriter&Scanner-优快云博客

本文介绍了一个使用Java进行文件读写的示例程序。该程序创建了员工对象数组，并将这些对象的数据写入到名为'employee.dat'的文件中。之后，程序从该文件中读取数据并创建新的员工对象数组。

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package xml;
import java.util.*;
import java.io.*;

public class TextFileTest {

	public static void main(String[] args){
		Employee[] staff=new Employee[3];

		staff[0]=new Employee("a",2500,1989,1,1);
		staff[1]=new Employee("b",2500,1989,1,1);
		staff[2]=new Employee("c",2500,1989,1,1);

		try{
			PrintWriter out=new PrintWriter("employee.dat");
			writeData(staff,out);
			out.close();

			Scanner in=new Scanner(new FileReader("employee.dat"));
			Employee[] newStaff=readData(in);
			in.close();

			for(Employee e:newStaff)
				System.out.println(e);
		}catch(IOException e){
			System.out.println(e.toString());
		}
	}

	public static void writeData(Employee[] employees,PrintWriter out){
		out.println(employees.length);

		for(Employee e:employees)
			e.writeData(out);
	}

	public static  Employee[] readData(Scanner in){
		int n=in.nextInt();
		in.nextLine();

		Employee[] employees=new Employee[n];
		for(int i=0;i<n;i++){
			employees[i]=new Employee();
			employees[i].readData(in);
		}

		return employees;
	}

}
class Employee{
	private String name;
	private double salary;
	private Date hireDay;

	public Employee(){

	}
	public Employee(String name,double salary,int year,int month,int day){
		this.name=name;
		this.salary=salary;
		GregorianCalendar calendar=new GregorianCalendar(year,month-1,day);
		this.hireDay=calendar.getTime();
	}

	public String getName(){
		return this.name;
	}
	public double getSalary(){
		return this.salary;
	}
	public Date getHireDay(){
		return this.hireDay;
	}

	public void raiseSalary(double byPersent){
		double raise=this.salary*byPersent/100;
		this.salary+=raise;
	}

	public String toString(){
		return getClass().getName()+"name="+name+",salary="+this.salary+",hireday="+this.hireDay+"]";
	}

	public void writeData(PrintWriter out){
		GregorianCalendar calendar=new GregorianCalendar();
		calendar.setTime(this.hireDay);

		out.println(this.name+"|"+this.salary+"|"+calendar.get(Calendar.YEAR)+"|"+
				calendar.get(Calendar.MONTH)+"|"+calendar.get(Calendar.DAY_OF_MONTH));
	}

	public void readData(Scanner in){
		String line=in.nextLine();
		String[] tokens=line.split("\\|");
		this.name=tokens[0];
		this.salary=Double.parseDouble(tokens[1]);
		int y=Integer.parseInt(tokens[2]);
		int m=Integer.parseInt(tokens[3]);
		int d=Integer.parseInt(tokens[4]);
		GregorianCalendar calendar=new GregorianCalendar(y,m-1,d);
		this.hireDay=calendar.getTime();

	}
}