Alinear texto en Java

Sheeraz Gul 12 octubre 2023
Alinear texto en Java

Podemos crear nuestra clase, que extenderá la clase Java.text.Format para alinear el texto. Este tutorial demuestra cómo alinear texto en Java.

Alinear texto en Java

El Formato es una clase base abstracta para formatear información confidencial como números, mensajes, fechas, etc. Implementaremos nuestra clase llamada Text_Alignment, que ampliará la clase Formato para que podamos formatear el texto para alinearlo.

Esta clase definirá tres enumeraciones, Centro, Derecha e Izquierda, que luego se usarán en una condición de cambio como casos para alinear el texto de acuerdo con las instrucciones dadas. Esta clase usa un número máximo de caracteres para una línea y luego alinea cada línea.

Vea el ejemplo.

package delftstack;

import java.text.FieldPosition;
import java.text.Format;
import java.text.ParsePosition;
import java.util.ArrayList;
import java.util.List;
import java.util.ListIterator;

public class Text_Alignment extends Format {
  private static final long serialVersionUID = 1L;

  public enum Align_Text {
    LEFT,
    CENTER,
    RIGHT,
  }

  // justification for formatting
  private Align_Text Current_Alignment;

  // maximum length of a line
  private int Maximum_Chars;

  public Text_Alignment(int Maximum_Chars, Align_Text alignment) {
    switch (alignment) {
      case LEFT:
      case CENTER:
      case RIGHT:
        this.Current_Alignment = alignment;
        break;
      default:
        throw new IllegalArgumentException("invalid justification");
    }
    if (Maximum_Chars < 0) {
      throw new IllegalArgumentException("Maximum_Chars should be positive.");
    }
    this.Maximum_Chars = Maximum_Chars;
  }

  public StringBuffer format(
      Object Input_Object, StringBuffer Align_Position, FieldPosition Ignore_Position) {
    String Demo = Input_Object.toString();
    List<String> Strings_List = Split_String(Demo);
    ListIterator<String> List_Iterator = Strings_List.listIterator();

    while (List_Iterator.hasNext()) {
      String Wanted_String = List_Iterator.next();

      // put the spaces in the right place.
      switch (Current_Alignment) {
        case RIGHT:
          ALIGN(Align_Position, Maximum_Chars - Wanted_String.length());
          Align_Position.append(Wanted_String);
          break;

        case CENTER:
          int toAdd = Maximum_Chars - Wanted_String.length();
          ALIGN(Align_Position, toAdd / 2);
          Align_Position.append(Wanted_String);
          ALIGN(Align_Position, toAdd - toAdd / 2);
          break;

        case LEFT:
          Align_Position.append(Wanted_String);
          ALIGN(Align_Position, Maximum_Chars - Wanted_String.length());
          break;
      }
      Align_Position.append("\n");
    }
    return Align_Position;
  }

  protected final void ALIGN(StringBuffer Append_To, int Length) {
    for (int i = 0; i < Length; i++) Append_To.append(' ');
  }

  String format(String Demo) {
    return format(Demo, new StringBuffer(), null).toString();
  }

  // ParseObject will be required but it is not useful here.
  public Object parseObject(String Source_String, ParsePosition position) {
    return Source_String;
  }

  private List<String> Split_String(String Demo) {
    List<String> List = new ArrayList<String>();
    if (Demo == null)
      return List;
    for (int x = 0; x < Demo.length(); x = x + Maximum_Chars) {
      int End_Index = Math.min(x + Maximum_Chars, Demo.length());
      List.add(Demo.substring(x, End_Index));
    }
    return List;
  }

  public static void main(String[] args) {
    String Demo_Text =
        "DelftStack is a resource for everyone interested in programming, embedded software, and electronics."
        + "It covers the programming languages like Python, C/C++, C#, and so on in this website's first development stage."
        + "Open-source hardware also falls in the website's scope, like Arduino, Raspberry Pi, and BeagleBone."
        + "DelftStack aims to provide tutorials, how-to's, and cheat sheets to different levels of developers and hobbyists.";
    // Align Left
    Text_Alignment align = new Text_Alignment(50, Align_Text.LEFT);
    System.out.println("This is the left alignment of the given text: ");
    System.out.println(align.format(Demo_Text));

    // Align Right
    Text_Alignment align1 = new Text_Alignment(50, Align_Text.RIGHT);
    System.out.println("This is the right alignment of the given text: ");
    System.out.println(align1.format(Demo_Text));

    // Align Center
    Text_Alignment align2 = new Text_Alignment(50, Align_Text.CENTER);
    System.out.println("This is the center alignment of the given text: ");
    System.out.println(align2.format(Demo_Text));
  }
}

El código anterior formatea el texto dado en la alineación Izquierda, Derecha y Centro. Ver salida:

This is the left alignment of the given text:
DelftStack is a resource for everyone interested i
n programming, embedded software, and electronics.
It covers the programming languages like Python, C
/C++, C#, and so on in this website's first develo
pment stage.Open-source hardware also falls in the
 website's scope, like Arduino, Raspberry Pi, and
BeagleBone.DelftStack aims to provide tutorials, h
ow-to's, and cheat sheets to different levels of d
evelopers and hobbyists.

This is the right alignment of the given text:
DelftStack is a resource for everyone interested i
n programming, embedded software, and electronics.
It covers the programming languages like Python, C
/C++, C#, and so on in this website's first develo
pment stage.Open-source hardware also falls in the
 website's scope, like Arduino, Raspberry Pi, and
BeagleBone.DelftStack aims to provide tutorials, h
ow-to's, and cheat sheets to different levels of d
                          evelopers and hobbyists.

This is the center alignment of the given text:
DelftStack is a resource for everyone interested i
n programming, embedded software, and electronics.
It covers the programming languages like Python, C
/C++, C#, and so on in this website's first develo
pment stage.Open-source hardware also falls in the
 website's scope, like Arduino, Raspberry Pi, and
BeagleBone.DelftStack aims to provide tutorials, h
ow-to's, and cheat sheets to different levels of d
             evelopers and hobbyists.
Sheeraz Gul avatar Sheeraz Gul avatar

Sheeraz is a Doctorate fellow in Computer Science at Northwestern Polytechnical University, Xian, China. He has 7 years of Software Development experience in AI, Web, Database, and Desktop technologies. He writes tutorials in Java, PHP, Python, GoLang, R, etc., to help beginners learn the field of Computer Science.

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