sakananote: 20110624 Java練習小記

package chapter14.homework;
import java.io.*;
public class Chapter14Homework2 {
public static void main(String[] args) {
  try{
   //這邊忘記 PrintWriter 的用法要多練習    PrintWriter pw = new PrintWriter(new BufferedWriter(new FileWriter("test2.txt")));

   pw.println("A long time ago,");
   pw.println("There was a little girl.");

   pw.close();
  }
  catch(IOException e)
  {
   System.out.println("輸出入錯誤");
  }
}
}

package chapter14.homework;
import java.io.*;
public class Chapter14Homework3 {
public static void main(String[] args) {
  if( args.length != 1)
  {
   System.out.println("請指定正確檔案名稱");
   System.exit(1);
  }

  try{
   PrintWriter pw = new PrintWriter(new BufferedWriter(new FileWriter(args[0])));

   pw.println("A long time ago,");
   pw.println("There was a little girl.");

   pw.close();
  }
  catch(IOException e){
   System.out.println("輸出入錯誤");
  }
}
}

package chapter15.lab1;
//啟動執行緒
//延伸執行緒類別 Thread
class Car extends Thread
{
private String name;

public Car(String nm)
{
  name = nm;
}

//這邊一定要定義一個 run() 方法 public void run()
{
  for( int i=0; i<5;i++)
  {
   System.out.println("正在進行"+name+"的處理");
  }
}
}
class Sample1 {
public static void main(String[] args) {
  Car car1 = new Car("1號車");

  //啟動新的執行緒   car1.start();

  for(int i=0; i<5; i++)
  {
   System.out.println("正在進行main()的處理");
  }
}
}

package chapter15.lab2;
//啟動多個執行緒
//延伸執行緒類別 Thread
class Car extends Thread
{
private String name;

public Car(String nm)
{
  name = nm;
}

//這邊一定要定義一個 run() 方法 public void run()
{
  for( int i=0; i<5;i++)
  {
   System.out.println("正在進行"+name+"的處理");
  }
}
}
class Sample2 {
public static void main(String[] args) {
  //執行 2 個執行緒   Car car1 = new Car("1 號車");
  car1.start();

  Car car2 = new Car("2號車");
  car2.start();

  for (int i=0; i< 5 ; i++)
  {
   System.out.println("正在進行main()的處理");
  }
}
}

package chapter15.lab3;
//暫停執行緒
class Car extends Thread
{
private String name;

public Car(String nm)
{
  name = nm;
}

public void run()
{
  for(int i=0; i<5; i++)
  {
   try{
    //處理這個敘述的時候會暫停 1 秒處理執行緒, sleep() 的單位是千分之ㄧ秒     sleep(1000);
    System.out.println("正在進行"+name+"的處理");
   }
   //處理例外狀況    catch(InterruptedException e)
   {

   }
  }
}
}
class Sample3 {
public static void main(String[] args) {
  Car car1 = new Car("1號車");
  car1.start();

  for(int i=0; i<5; i++)
  {
   System.out.println("正在處理main()");
  }
}
}

package chapter15.lab4;
//暫停別的執行緒
class Car extends Thread
{
private String name;

public Car(String nm)
{
  name = nm;
}

public void run()
{
  for(int i=0; i<5; i++)
  {
   System.out.println("正在進行"+name+"的處理");
  }
}
}
class Sample4 {
public static void main(String[] args) {
  //這次暫停的是 main這邊   Car car1 = new Car("1號車");
  car1.start();

  for(int i=0; i<5; i++)
  {
   try{
    //每次執行這個執行緒都會暫停1秒     Thread.sleep(1000);
    System.out.println("正在進行main()的處理");
   }
   catch(InterruptedException e){}
  }
}
}

package chapter15.lab5;
//等待執行緒
class Car extends Thread
{
private String name;

public Car(String nm)
{
  name = nm;
}

public void run()
{
  for(int i=0; i<5; i++)
  {
   System.out.println("正在進行"+name+"的處理");
  }
}
}
class Sample5 {
public static void main(String[] args) {
  Car car1 = new Car("1號車");
  car1.start();

  try{
   //會等待 car1 這個執行緒結束之後,再執行其他的執行緒    car1.join();
  }
  catch(InterruptedException e){}

  System.out.println("正在處理main()");
}
}

package chapter15.lab6;
//實作Runnable 介面來執行執行緒
//如果執行 Runnable 的介面一定要執行 Runnable.run()
class Car implements Runnable
{
private String name;

public Car(String nm)
{
  name = nm;
}
public void run()
{
  for (int i=0; i<5; i++)
  {
   System.out.println("正在進行"+name+"的處理");
  }
}
}
class Sample6 {
public static void main(String[] args) {
  Car car1 = new Car("1號車");

  //產生 Thread 類別的物件, 然後把 car1 變數放進去   Thread th1 = new Thread(car1);
  //啟動執行緒   th1.start();

  for(int i=0; i<5; i++)
  {
   System.out.println("正在進行main()的處理");
  }
}
}

package chapter15.lab7;
//同步: 執行緒所引起互相扺觸狀況
//客運公司類別
class Company
{
//先初始化車資為 0 private int sum = 0;

//統計賺到的車資, 加上 synchronized 可以做到某執行緒呼叫 add()方法時, 其他執行緒不得再呼叫 add() 方法 public synchronized void add(int a)
{
  int tmp = sum;
  System.out.println("現在總計"+tmp+"元");
  System.out.println("賺了"+a+"元");
  tmp = tmp +a;
  System.out.println("總計為"+tmp+"元");
  sum = tmp;
}
}
//司機類別
class Driver extends Thread
{
//建立一個 Company 類別的變數 comp private Company comp;

public Driver(Company c)
{
  comp = c;
}

public void run()
{
  for(int i=0; i<3; i++)
  {
   comp.add(50);
  }
}
}

class Sample7 {
public static void main(String[] args) {
  //產生客運公司的物件   Company cmp = new Company();

  Driver drv1 = new Driver(cmp);
  drv1.start();

  Driver drv2 = new Driver(cmp);
  drv2.start();
}
}

package chapter15.homework2;

class Car implements Runnable
{
private String name;

public Car(String nm)
{
  name = nm;
}

//這邊一定要定義一個 run() 方法 public void run()
{
  for( int i=0; i<5;i++)
  {
   System.out.println("正在進行"+name+"的處理");
  }
}
}
class Chapter15Homework2 {
public static void main(String[] args) {
  //執行 2 個執行緒   Car car1 = new Car("1 號車");
  Thread th1 = new Thread(car1);
  th1.start();

  Car car2 = new Car("2號車");
  //跟使用 Thread 子類別 car2.start(); 方法不同的是
  //要先產生 Thread 類別物件, 然後把變數放進去
  Thread th2 = new Thread(car2);
  //再啟動執行緒 ^^ 這次我有記住   th2.start();

  for (int i=0; i< 5 ; i++)
  {
   System.out.println("正在進行main()的處理");
  }
}
}

package chapter15.homework3;

class Car implements Runnable
{
private String name;

public Car(String nm)
{
  name = nm;
}

public void run()
{
  for(int i=0; i<5; i++)
  {
   try{
    //處理這個敘述的時候會暫停 1 秒處理執行緒, sleep() 的單位是千分之ㄧ秒
    //由於不是直接繼承 Thread 子類別, 所以 sleep(); 不能直接寫, 要使用 Thread.sleep()
    Thread.sleep(1000);
    System.out.println("正在進行"+name+"的處理");
   }
   //處理例外狀況    catch(InterruptedException e)
   {

   }
  }
}
}
class Chapter15Homework3 {
public static void main(String[] args) {
  Car car1 = new Car("1號車");
  //car1.start();
  Thread th = new Thread(car1);
  th.start();

  for(int i=0; i<5; i++)
  {
   System.out.println("正在處理main()");
  }
}
}

package chapter16.lab1;
//Java Applet 練習
//匯入相關套件
import java.applet.Applet;
import java.awt.Graphics;
//要使用 Java Applet 要從Applet 延伸子類別 public class Sample1 extends Applet
{
//要顯示 Applet的時候呼叫的方法 public void paint(Graphics g)
{
  //drawString("顯示字串", x, y)   g.drawString("歡迎來到 java Applet", 10, 10);
}
}

package chapter16.lab2;
//劃線的Applet
import java.applet.Applet;
import java.awt.Color;
import java.awt.Graphics;

public class Sample2 extends Applet
{

public void paint(Graphics g)
{
  //設定顏色為紅色   g.setColor(Color.red);

  //drawLine(線段起點座標線段終點座標)   g.drawLine(10, 10, 100, 100);

  //顯示文字   g.drawString("Hello",100,100);
}
}

package chapter16.lab3;
//顯示圖片
import java.applet.Applet;
import java.awt.Graphics;
import java.awt.Image;
public class Sample3 extends Applet
{
Image img;

//這個方法只有在 Applet 啟動才會呼叫一次 public void init()
{
  img = getImage(getDocumentBase(),"Sunset.jpg");
}
public void paint(Graphics g)
{
  g.drawImage(img, 10, 10, this);
}
}

package chapter16.lab4;
//與滑鼠產生互動
import java.applet.Applet;
import java.awt.Graphics;
import java.awt.event.MouseListener;
import java.awt.event.MouseEvent;
import java.awt.Color;
//實作 MouseListener public class Sample4 extends Applet implements MouseListener
{
//初始 x, y 座標 int x = 10;
int y = 10;

public void init()
{
  //呼叫 addMouseListener 方法, 接收滑鼠已經按下這個事件準備工作   addMouseListener(this);
}

public void mouseClicked(MouseEvent e)
{
}
//滑鼠游標進入 Applet 範圍之後 public void mouseEntered(MouseEvent e)
{
}
//滑鼠游標離開 Applet 範圍之後 public void mouseExited(MouseEvent e){}

//當滑鼠按下要執行的事情 public void mousePressed(MouseEvent e)
{
  //記住滑鼠按下的位置   x = e.getX();
  y = e.getY();
  //更新螢幕顯示   repaint();
}
public void mouseReleased(MouseEvent e){}

public void paint(Graphics g)
{
  g.setColor(Color.blue);
  g.fillOval(x, y, 10, 10);
}
}

package chapter16.lab5;
//與滑鼠產生互動
import java.applet.Applet;
import java.awt.Graphics;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
public class Sample5 extends Applet
{
int x = 10;
int y = 10;

public void init()
{
  //使用 MouseAdapter() 這個類別會讓相關設定更簡單   addMouseListener(new MouseAdapter()
  {
   public void mousePressed(MouseEvent e)
   {
    x = e.getX();
    y = e.getY();
    repaint();
   }
  });
}

public void paint(Graphics g)
{
  g.fillOval(x, y, 10, 10);
}
}

package chapter16.lab6;
//使用 AWT (Abstract Window Toolkit)
import java.applet.Applet;
import java.awt.Button;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
//實作 ActionListener , 來讓按鈕被按下執行某些動作 public class Sample6 extends Applet implements ActionListener
{
Button bt;

public void init()
{
  bt = new Button("start");
  //接收按鈕被按下的準備工作   bt.addActionListener(this);
  //使用 add() 方法將它加到 Applet 上面   add(bt);
}
public void actionPerformed(ActionEvent ae)
{
  //按鈕被按下的處理  bt.setLabel("stop"); }

}

package chapter16.lab7;//讓數字動起來
import java.applet.Applet;
import java.awt.Graphics;
public class Sample7 extends Applet implements Runnable
{
int num;

public void init()
{
  Thread th;
  th = new Thread(this);
  th.start();
}

public void run()
{
  try{
   for(int i=0; i<10; i++)
   {
    num = i;
    repaint();
    Thread.sleep(1000);
   }
  }
  catch(InterruptedException e){}

}
public void paint(Graphics g)
{
  String str = "數字" + num + "!";
  g.drawString(str, 10, 10);
}
}

sakananote

星期五, 6月 24, 2011

20110624 Java練習小記

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