└∩δσ≥ FormLayout

┬ εΩφσ α∩δσ≥α FormLayout (≡Φ±. 2) ∞√ ≡α±∩εδεµΦδΦ ≥σ µσ ±α∞√σ ε≡παφ√ ≤∩≡αΓδσφΦ , Ωε≥ε≡√σ ß√δΦ Φ±∩εδⁿτεΓαφ√ Γ ∩≡σΣ√Σ≤∙σ∞ α∩δσ≥σ FormDemo. ╬ΣφαΩε Σδ  ≤ΩαταφΦ  ±∩ε±εßα ≡ατ∞σ∙σφΦ  Ωε∞∩εφσφ≥ ∞√ Γ√∩εδφΦδΦ φα±≥≡εΘΩ≤ ±Φ±≥σ∞√ Layout Manager, Γ√ß≡αΓ ≡σµΦ∞ GridLayout.

╨Φ±. 2. ╬Ωφε α∩δσ≥α FormLayout ─δ  ≥επε ≈≥εß√ ≤ΓΦΣσ≥ⁿ ≡Φ±≤φεΩ Γ ≤ΓσδΦ≈σφφε∞ ΓΦΣσ, ±ΣσδαΘ≥σ ∙σδ≈εΩ ∞√°ⁿ■ ∩ε Φτεß≡αµσφΦ■

╚ ⌡ε≥  ∩εΩα σ∙σ Γφσ°φΦΘ ΓΦΣ φα°σΘ ⌠ε≡∞√ ε±≥αΓδ σ≥ µσδα≥ⁿ δ≤≈°σπε, ≡α±∩εδεµσφΦσ ε≥Σσδⁿφ√⌡ Ωε∞∩εφσφ≥ φσ Φτ∞σφ σ≥±  ∩≡Φ Φτ∞σφσφΦΦ ≡ατ∞σ≡εΓ εΩφα α∩δσ≥α.

╧≡εßδσ∞α ταΩδ■≈ασ≥±  Γ ≥ε∞, ≈≥ε Γ ≡σµΦ∞σ GridLayout φσ ≤Σασ≥±  ≤∩≡αΓδ ≥ⁿ ≡ατ∞σ≡α∞Φ Ωε∞∩εφσφ≥. ─δ  ≤±≥≡αφσφΦ  ²≥επε φσΣε±≥α≥Ωα ±δσΣ≤σ≥ Φ±∩εδⁿτεΓα≥ⁿ ≡σµΦ∞ GridBagLayout. ╥αΩ ΩαΩ ²≥ε≥ ≡σµΦ∞ ±δεµσφ Σδ  Φ±∩εδⁿτεΓαφΦ  ßστ ΓΦτ≤αδⁿφεπε ∩≡εσΩ≥Φ≡εΓαφΦ , ∞√ ε≥δεµΦ∞ ΣαδⁿφσΘ°σσ ±εΓσ≡°σφ±≥εΓεΓαφΦσ φα°σΘ ⌠ε≡∞√ Σε ≥σ⌡ ∩ε≡, ∩εΩα φσ ταΘ∞σ∞±  Φτ≤≈σφΦσ∞ ±εε≥Γσ≥±≥Γ≤■∙Φ⌡ ±≡σΣ±≥Γ Java WorkShop.

╚±⌡εΣφ√Θ ≥σΩ±≥ α∩δσ≥α FormLayout

╚±⌡εΣφ√Θ ≥σΩ±≥ α∩δσ≥α FormLayout ∩≡αΩ≥Φ≈σ±ΩΦ ∩εΓ≥ε≡ σ≥ Φ±⌡εΣφ√Θ ≥σΩ±≥ α∩δσ≥α FormDemo, ≡α±±∞ε≥≡σφφ√Θ Γ φα°σΘ ∩≡σΣ√Σ≤∙σΘ ±≥α≥ⁿσ. ┼ΣΦφ±≥Γσφφεσ ε≥δΦ≈Φσ ταΩδ■≈ασ≥±  Γ ≥ε∞, ≈≥ε Γ ∞σ≥εΣσ init ∞√ Γ√∩εδφΦδΦ φα±≥≡εΘΩ≤ ±Φ±≥σ∞√ Layout Manager, ≤±≥αφεΓΦΓ ≡σµΦ∞ GridLayout:

public void init() 
{
  setLayout(new GridLayout(4, 3));
  . . .
}

╟Σσ±ⁿ Σδ  ≡ατ∞σ∙σφΦ  Ωε∞∩εφσφ≥ Γ εΩφσ α∩δσ≥α ±ετΣασ≥±  ≥αßδΦ÷α Φτ ≈σ≥√≡σ⌡ ±≥≡εΩ Φ ≥≡σ⌡ ±≥εδß÷εΓ.

╧εδφ√Θ Φ±⌡εΣφ√Θ ≥σΩ±≥ α∩δσ≥α FormLayout Γ√ φαΘΣσ≥σ Γ δΦ±≥Φφπσ 1.

╦Φ±≥Φφπ 1. ╘αΘδ FormLayout.java

import java.applet.Applet;
import java.awt.*;
import java.util.*;

public class FormLayout extends Applet 
{
  Button btReady;  

  Checkbox chbox1;
  Checkbox chbox2; 

  CheckboxGroup grRadio;
  Checkbox rd1;
  Checkbox rd2;
  Checkbox rd3;  

  Choice ch1;

  Label lbFirstName;
  Label lbSecondName;

  TextField txtFirstName;
  TextField txtSecondName;
  TextArea  txta;

  public void init() 
  {
    setLayout(new GridLayout(4, 3));

    chbox1 = new Checkbox("First");
    add(chbox1);

    lbFirstName = new Label(
      "Enter your first name:");
    add(lbFirstName);    

    txtFirstName = new TextField(" ", 30);
    add(txtFirstName);

    chbox2 = new Checkbox("Second");
    add(chbox2);

    lbSecondName = new Label(
     "Enter your second name:");
    add(lbSecondName);

    txtSecondName = new TextField(" ", 30);
    add(txtSecondName);

    grRadio = new CheckboxGroup();
    rd1 = new Checkbox("Mode 1",
      grRadio, true);
    rd2 = new Checkbox("Mode 2",
      grRadio, false);
    rd3 = new Checkbox("Mode 3",
      grRadio, false);

    add(rd1);
    add(rd2);
    add(rd3);

    ch1 = new Choice();
    ch1.addItem("White");
    ch1.addItem("Green");
    ch1.addItem("Yellow");

    add(ch1);

    setBackground(Color.yellow);

    lbFirstName.setBackground(
      Color.yellow);
    lbSecondName.setBackground(
      Color.yellow);

    rd1.setBackground(Color.yellow);
    rd2.setBackground(Color.yellow);
    rd3.setBackground(Color.yellow);    

    chbox1.setBackground(Color.yellow);
    chbox2.setBackground(Color.yellow);

    txta = new TextArea("", 6, 45);
    add(txta);
    txta.setBackground(Color.white);

    btReady = new Button("Ready");
    add(btReady);
  }

  public String getAppletInfo()
  {
    return "Name: FormDemo";
  }

  public void paint(Graphics g)
  {
    Dimension dimAppWndDimension = 
      getSize();

    g.setColor(Color.black);
    g.drawRect(0, 0, 
      dimAppWndDimension.width  - 1, 
      dimAppWndDimension.height - 1);
  }

  public boolean action(Event evt,
    Object obj)
  {
    Button btn;
    String str1, str2;

    if(evt.target instanceof Button)
    {
      if(evt.target.equals(btReady))
      {
        btn = (Button)evt.target;

	str1 = txtFirstName.getText();
	str2 = txtSecondName.getText();	

	if(chbox1.getState())
	  txta.append(str1);

	if(chbox2.getState())
	  txta.append(str2);

	if(rd1.getState())
	  txta.append("\nMode 1\n");	

	if(rd2.getState())
	  txta.append("\nMode 2\n");

	if(rd3.getState())
	  txta.append("\nMode 3\n");
      }
      else
      {
	return false;
      }
      return true;
    }
    else if(evt.target instanceof Choice)
    {
      if(evt.target.equals(ch1))
      {
	if(ch1.getSelectedIndex() == 0)
	  txta.setBackground(Color.white);	  

	if(ch1.getSelectedIndex() == 1)
	  txta.setBackground(Color.green);

	if(ch1.getSelectedIndex() == 2)
	  txta.setBackground(Color.yellow);
      }
    }
    return false;
  }
}

╚±⌡εΣφ√Θ ≥σΩ±≥ ΣεΩ≤∞σφ≥α HTML, ±ετΣαφφ√Θ Σδ  φα°σπε α∩δσ≥α ±Φ±≥σ∞εΘ Java WorkShop, ∩≡σΣ±≥αΓδσφ Γ δΦ±≥Φφπσ 2.

╦Φ±≥Φφπ 2. ╘αΘδ FormLayout.tmp.html

<applet
  name="FormLayout"
  code="FormLayout"
  codebase=
  "file:/e:/sun/articles/vol7/src/FormLayout"
  width="500"
  height="600"
  align="Top"
  alt="If you had a java-enabled browser,
 you would see an applet here.">
</applet>