import java.awt.event.*
import javax.swing.*
@SuppressWarnings("serial")
class Frame20 extends JFrame implements ActionListener
{ JButton jb1
JTextField jtf1,jtf2
Frame20()
{ setLayout(new BorderLayout())
JPanel jp1 = new JPanel()
JPanel jp2 = new JPanel()
JPanel jp3 = new JPanel()
jtf1 = new JTextField("", 12)
jp1.add(new JLabel("人民币金额:"))
jp1.add(jtf1)
jb1=new JButton("转换成美元等于")
jb1.addActionListener(this)
jp2.add(jb1)
jtf2 = new JTextField("", 12)
jp3.add(new JLabel("美元金额:"))
jp3.add(jtf2)
add(jp1)
add(jp2)
add(jp3)
setLayout(new BoxLayout(this.getContentPane(), BoxLayout.Y_AXIS))
setBounds(120,125,300,200) //设定窗体大小和位置
setTitle("美元转换") //设定窗体标题
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE)
setVisible(true) //设定窗体可见
}
public void actionPerformed(ActionEvent e)
{ String rmb
double dollar
if(e.getSource()==jb1)
{ rmb=jtf1.getText()
dollar=Integer.parseInt(rmb)*0.1609
jtf2.setText(String.valueOf(dollar))
}
}
}
public class meiyuan_zhuanghuan
{ public static void main(String []args)
{ new Frame20()
}
}
//Client.java//多给点财富
import java.util.*
import java.io.*
import java.net.*
public class Client
{
public static void main(String[] args) throws Exception
{
Client.C=new Socket(Client.ServerName,Client.ServerPort)
Client.BR=new BufferedReader(new InputStreamReader(Client.C.getInputStream()))
Client.PW=new PrintWriter(Client.C.getOutputStream())
while(true)
{
System.out.println(Client.MenuInfor)
Client.M=Client.SC.nextInt()
Client.ProcessMenu()
}
}
private static void ProcessMenu() throws Exception
{
Client.SB.setLength(0)
//Client.SB=new StringBuffer()
if(0==Client.M)
{
Client.SB.append(Client.M)
Client.SB.append(Client.Separator)
Client.SB.append(0.0)
Client.WriteStrToNetStream(Client.SB.toString())
Client.BR.close()
Client.PW.close()
Client.C.close()
System.exit(0)
}
else if(Client.M>=1 &&Client.M<=7)
{
Client.SB.append(Client.M)
System.out.println("请输入第一个 *** 作数：")
Client.Num1=Client.SC.nextDouble()
Client.SB.append(Client.Separator)
Client.SB.append(Client.Num1)
if(Client.M>=1 &&Client.M<=5)
{
System.out.println("请输入第二个 *** 作数：")
Client.Num2=Client.SC.nextDouble()
Client.SB.append(Client.Separator)
Client.SB.append(Client.Num2)
}
Client.WriteStrToNetStream(Client.SB.toString())
switch(Client.M)
{
case 1:
System.out.println(String.format("%1$f+%2$f=%3$s",Client.Num1,Client.Num2,Client.BR.readLine()))
break
case 2:
System.out.println(String.format("%1$f-%2$f=%3$s",Client.Num1,Client.Num2,Client.BR.readLine()))
break
case 3:
System.out.println(String.format("%1$f*%2$f=%3$s",Client.Num1,Client.Num2,Client.BR.readLine()))
break
case 4:
System.out.println(String.format("%1$f/%2$f=%3$s",Client.Num1,Client.Num2,Client.BR.readLine()))
break
case 5:
System.out.println(String.format("pow(%1$f,%2$f)=%3$s",Client.Num1,Client.Num2,Client.BR.readLine()))
break
case 6:
System.out.println(String.format("abs(%1$f)=%2$s",Client.Num1,Client.BR.readLine()))
break
case 7:
System.out.println(String.format("sin(%1$f)=%2$s",Client.Num1,Client.BR.readLine()))
break
}
}
else
{
System.out.println("无法处理的菜单命令。")
}
}
private static void WriteStrToNetStream(String msg)
{
Client.PW.println(msg)
Client.PW.flush()
}
private static final String MenuInfor="菜单：\n0、退出\n1、加\n2、减\n3、乘\n4、除\n5、乘方\n6、绝对值\n7、正弦\n请选择一个："
private static int M=-1
private static double Num1,Num2
private static final String ServerName=null
private static final int ServerPort=9999
private static final String Separator="="
private static Scanner SC=new Scanner(System.in)
private static Socket C
private static BufferedReader BR
private static PrintWriter PW
private static StringBuffer SB=new StringBuffer()
}
//Server.java
import java.io.*
import java.net.*
import java.util.logging.*
public class Server
{
public static void main(String[] args) throws Exception
{
final String logf="log.txt"
String line=null
FileHandler fh=new FileHandler(logf)
Server.L.addHandler(fh)
ServerSocket ss=new ServerSocket(Server.ServerPort)
Server.S=ss.accept()
Server.BR=new BufferedReader(new InputStreamReader(Server.S.getInputStream()))
Server.PW=new PrintWriter(Server.S.getOutputStream())
while(true)
{
line=Server.BR.readLine()
//System.out.println(line)
if(null!=line)
{
if(Server.ProcessLine(line))
{
fh.flush()
fh.close()
Server.BR.close()
Server.PW.close()
Server.S.close()
System.exit(0)
}
else
{
Server.PW.println(Server.JieGuo)
Server.PW.flush()
//System.out.println(Server.JieGuo)
Server.L.log(Level.INFO,line)
Server.L.log(Level.INFO,Server.JieGuo)
}
}
}
}
private static boolean ProcessLine(String line)
{
boolean isexit=false
String[] strs=line.split(Server.Separator)
Server.M=Integer.parseInt(strs[0])
Server.Num1=Double.parseDouble(strs[1])
if(Server.M>=1 &&Server.M<=5)
{
Server.Num2=Double.parseDouble(strs[2])
}
//System.out.println(""+Server.M+" "+Server.Num1+" "+Server.Num2)
switch(Server.M)
{
case 0:
isexit=true
break
case 1:
Server.JieGuo=String.valueOf(Server.Num1+Server.Num2)
break
case 2:
Server.JieGuo=String.valueOf(Server.Num1-Server.Num2)
break
case 3:
Server.JieGuo=String.valueOf(Server.Num1*Server.Num2)
break
case 4:
if(0!=Server.Num2)
{
Server.JieGuo=String.valueOf(Server.Num1/Server.Num2)
}
else
{
Server.JieGuo="´íÎ󣬳ýÊý²»ÄÜΪ0¡£"
}
break
case 5:
Server.JieGuo=String.valueOf(Math.pow(Server.Num1,Server.Num2))
break
case 6:
Server.JieGuo=String.valueOf(Math.abs(Server.Num1))
break
case 7:
Server.JieGuo=String.valueOf(Math.sin(Server.Num1))
break
}
return isexit
}
private static int M=-1
private static double Num1,Num2
private static final int ServerPort=9999
private static final String Separator="="
private static String JieGuo
private static Socket S
private static BufferedReader BR
private static PrintWriter PW
private static Logger L=Logger.getAnonymousLogger()
}
本书采用任务驱动教学模式，通过任务的实施，使读者在读程序、学知识、写程序的过程中，逐渐掌握面向对象的Java程序设计思想和技能。本书共分12个单元，主要包括Java程序设计过程、基本语法规则、面向对象技术、数组与字符串、异常处理、GUI编程、输入/输出处理、多线程编程以及基础网络编程等内容。
本书适合作为高等职业院校计算机相关专业“Java程序设计”或者“面向对象程序设计”课程的教材，也可作为相关技术人员学习Java的参考用书。
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