• Java dasturchiga derazalar, tarmoqlar va kirish -chiqish tizimlarida ishlatiladigan ko'plab tizim funktsiyalarini aniq ajratish uchun boy sinflar to'plamini beradi. Bu sinflarning asosiy xususiyati shundaki, ular tizim interfeyslarining keng assortimenti uchun platformadan mustaqil abstraktlarni beradi. Sintaksis elementlari:
Satr oxirigacha izoh qoldiring
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//
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Ichki joylash mumkin bo'lmagan fikrlar
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/* ... */
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Vaziyat sezgirligi
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да
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O'zgaruvchan identifikator regex
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[_a-zA-Z$][_a-zA-Z0-9$]*
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O'zgaruvchiga qiymat tayinlash
O'zgaruvchan deklaratsiya
Topshiriq bilan o'zgaruvchan deklaratsiya
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=
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O'zgaruvchan deklaratsiya
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type variable
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Topshiriq bilan o'zgaruvchan deklaratsiya
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type variable = value
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Ifodalarni guruhlash
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( ... )
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Bloklash
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{ ... }
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Tenglik
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==
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Tengsizlik
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!=
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Taqqoslash
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< > <= >=
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Funktsiya ta'rifi
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public funct(a,b,c) { .... }
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Funktsional qo'ng'iroq
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f(a, b, ...)
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Parametrlarsiz funktsiyani chaqirish
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f()
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Keyingi
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;
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Agar – keyin
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if (condition) ...
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Agar - keyin - aks holda
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if (condition) ... else ... или condition ? ... : ...
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Cheksiz sikl
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while (true) ...
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Old shart bilan halqa
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while (condition) ...
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import java.applet.*;
import java.awt.*;
public class Rectangles extends Applet
{ DrawRectangles m_DrawRectThread = null;
DrawEllipse m_DrawEllipseThread = null;
NotifyTask m_NotifyTaskThread = null;
public String getAppletInfo()
{ return "Name: Rectangles";
}
public void paint(Graphics g)
{ Dimension dimAppWndDimension = getSize();
g.setColor(Color.yellow);
g.fillRect(0, 0, dimAppWndDimension.width - 1,dimAppWndDimension.height - 1);
g.setColor(Color.black);
g.drawRect(0, 0,dimAppWndDimension.width - 1,dimAppWndDimension.height - 1);
}
public void start()
{ if (m_DrawRectThread == null)
{ m_DrawRectThread = new DrawRectangles(this);
m_DrawRectThread.start();
}
if(m_DrawEllipseThread == null)
{ m_DrawEllipseThread = new DrawEllipse(this);
m_DrawEllipseThread.start();
}
if (m_NotifyTaskThread == null)
{ m_NotifyTaskThread =new NotifyTask(m_DrawEllipseThread);
m_NotifyTaskThread.start();
}
}
public void stop()
{ if (m_DrawRectThread != null)
{ m_DrawRectThread.stop();
m_DrawRectThread = null;
}
if (m_DrawEllipseThread == null)
{ m_DrawEllipseThread.stop();
m_DrawEllipseThread = null;
}
if (m_NotifyTaskThread != null)
{
m_NotifyTaskThread.stop();
m_NotifyTaskThread = null;
}
}
}
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Labarotoriya ishlari uchun topshiriqlar.
1. Vektorni tasvirlaydigan klass yarating (uch o'lchovli fazoda).
2. Konstruktori ikkita massivni oladigan sinfni yozing: qiymatlar massivi va qiymatlar massasi.
3. Berilgan element massivda yoki yo'qligini tekshiradigan usulni yozing.
Ushbu muammoni hal qilish uchun ikkilik qidiruvdan foydalaning.
4. Tenglamaning ildizini toping.
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