nextToken的運用

import java.math.BigInteger;
import java.io.*;
import java.util.*;

// inputtext.txt 檔案內容 COFFEE 50 4
// 從檔案讀入一列字串,讀入50 和 4 相乘再寫入另一檔案
class TestReadWrite
{

public static void main(String[] args)
{
String line;
//int price,total;
try
{
FileReader inputjerry=new FileReader("inputtext.txt");
BufferedReader binputjerry=new BufferedReader(inputjerry);
line=binputjerry.readLine();
StringTokenizer stline=new StringTokenizer(line, " ");



BigInteger bi1 = new BigInteger(stline.nextToken());
System.out.println(bi1);
BigInteger bi2 = new BigInteger(stline.nextToken());
System.out.println(bi2);
bi1 = bi1.add(bi2);

System.out.println(bi1);
FileWriter outputjerry=new FileWriter("outputtext.txt");
BufferedWriter boutputjerry=new BufferedWriter(outputjerry);
boutputjerry.write(String.valueOf(bi1));
boutputjerry.flush();



boutputjerry.close();
}
catch(Exception e)
{
System.out.println("Exception");
}
}
}

輸入檔與輸出檔運用

import java.util.StringTokenizer;

class TestFile

{

public static void main(String args[])

{

String inFile;

String outFile;

String a,c;

Double b,i=0.0;int k;

try

{

inFile=args[0];

FileReader rdinFile = new FileReader(inFile);

BufferedReader brdinFile = new BufferedReader(rdinFile);

for(k=1;k<12;k++)

{

a=brdinFile.readLine();

b=Double.parseDouble(a);

i=i+b;

}

System.out.println(i);

inFile=args[0];

StringTokenizer tokens = new StringTokenizer(inFile, ".t");

outFile=tokens.nextToken() + ".w" + tokens.nextToken();

System.out.println(outFile);

File myfile=new File(outFile);

myfile.createNewFile();

FileWriter fos= new FileWriter(outFile);

BufferedWriter bfos=new BufferedWriter(fos);

i=i/11;

c=String.valueOf(i);

bfos.write(c);

bfos.flush();

bfos.close();

}

catch (Exception e)

{

System.out.println("exception");

}

}

}

期中考

import java.awt.event.*;

import javax.swing.*;

public class TriangleMethod extends JFrame

implements ActionListener {

private JButton button;

private JPanel panel;

public static int a1,a2,b1,b2;

public static void main(String[] args)

{

a1 = Integer.parseInt(args[0]);

a2 = Integer.parseInt(args[1]);

b1 = Integer.parseInt(args[2]);

b2 = Integer.parseInt(args[3]);

TriangleMethod frame = new TriangleMethod();

frame.setSize(350, 300);

frame.createGUI();

frame.setVisible(true);

}

private void createGUI() {

setDefaultCloseOperation(EXIT_ON_CLOSE);

Container window = getContentPane();

window.setLayout(new FlowLayout() );

panel = new JPanel();

panel.setPreferredSize(new Dimension(300, 200));

panel.setBackground(Color.white);

window.add(panel);

button = new JButton("Press me");

window.add(button);

button.addActionListener(this);

}

public void actionPerformed(ActionEvent event) {

Graphics paper = panel.getGraphics();

drawLogo(paper, 10, 20);

//drawLogo(paper, 100, 100);

//drawTriangle(paper, 100, 10, 40, 40);

drawTriangle(paper, 10, 100, a1, a2);

}

private void drawLogo(Graphics drawingArea,

int xPos, int yPos) {

drawingArea.drawRect(xPos, yPos, b1, b2);

//drawingArea.drawRect(xPos, yPos, 40, 40);

//drawingArea.drawRect(xPos, yPos, 20, 20);

}

private void drawTriangle(Graphics drawingArea,

int xPlace,

int yPlace,

int width,

int height) {

drawingArea.drawLine(xPlace, yPlace,

建構子程式

class d9539186

{

public static void main(String[] args)
{
int w,u;
int a,b;
a=6;
b=8;

Triangel Alan1 = new Triangel();
Ractabgle Alan2 = new Ractabgle();

u=Alan1.add(a,b);
w=Alan2.add(a,b);
System.out.println(u);
System.out.println(w);
}

}

class Triangel
{
static int add(int a,int b)
{
int x,y,z;
x=a;
y=b ;
z=(x*y)/2;
return z ;
}
}
class Ractabgle
{
static int add(int a,int b)
{
int x,y,z;
x=a;
y=b ;
z=x*y;
return z ;
}
}

cos,sin

public class HelloWorld {

public static void main(String[] args) {

int x,y,z;
double pi;

x=1;
y=1;
z=x+y;
pi=Math.PI;
System.out.println("x="+x);
System.out.println("x="+y);
System.out.println("x="+z);
System.out.println("cos(0)="+Math.cos(0));
System.out.println("cos(pi/4)="+Math.cos(pi/4));
System.out.println("cos(pi/2)="+Math.cos(pi/2));
System.out.println("cos(3pi/2)="+Math.cos(3*pi/2));
System.out.println("cos(2pi)="+Math.cos(2*pi));
System.out.println("sin(0))="+Math.sin(0));
System.out.println("sin(pi/4))="+Math.sin(pi/4));
System.out.println("sin(pi/2))="+Math.sin(pi/2));
System.out.println("sin(3*pi/2))="+Math.sin(3*pi/2));
System.out.println("sin(2*pi))="+Math.sin(2*pi));
}

}

聖誕樹

class first
{
public static void main(String[] args)
{

System.out.println(" *");
System.out.println(" *** ");
System.out.println(" ***** ");
System.out.println(" ******* ");
System.out.println(" ********* ");
System.out.println(" *** ");
System.out.println(" *** ");

}

}

java

1.為何why要選修這門課?(動機)

為了多認識更多程式設計

2.希望從這門課獲得那些知識?(目標)

java相關的應用與設計

3.我要如何修習這一門課?(態度與方法)

主動學習更多的範例 , 多做多學習

http://java.sun.com/docs/books/tutorial/getStarted/cupojava/win32.html#win32-2c