public class JLabel
extends JComponent implements SwingConstants, Accessible

java.lang.Object
 Ｌ java.awt.Component
     Ｌ java.awt.Container
         Ｌ javax.swing.JComponent
             Ｌ javax.swing.JLabel

JLabelクラスのオブジェクトを作成

JLabel
public JLabel(String text)

JLabel label = new JLabel("ラベル");

JLabel
public JLabel()

JLabel label = new JLabel();

表示文字列の設定

setText
public void setText(String text)

JLabel label = new JLabel();
label.setText("ラベル");

サンプルプログラム

import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JLabel;
import java.awt.Container;
import java.awt.BorderLayout;

class SSample1_1 extends JFrame{
  public static void main(String args[]){
    SSample1_1 frame = new SSample1_1("タイトル");
    frame.setVisible(true);
  }

  SSample1_1(String title){
    setTitle(title);
    setBounds(100, 100, 300, 250);
    setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

    JPanel p = new JPanel();

    JLabel label1 = new JLabel("今日の天気：");
    JLabel label2 = new JLabel();
    label2.setText("晴れのち曇り");

    p.add(label1);
    p.add(label2);

    Container contentPane = getContentPane();
    contentPane.add(p, BorderLayout.CENTER);
  }
}

setForeground
public void setForeground(Color fg)

JLabel label = new JLabel("ラベル");

label.setForeground(Color.RED);

setBackground
public void setBackground(Color bg)

JLabel label = new JLabel("ラベル");

label.setBackground(Color.GREEN);

透明/非透明の切り替え

setOpaque
public void setOpaque(boolean isOpaque)

JLabel label = new JLabel();
label.setOpaque(true);

サンプルプログラム

import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JLabel;
import java.awt.Color;
import java.awt.Container;
import java.awt.BorderLayout;

class SSample2_1 extends JFrame{
  public static void main(String args[]){
    SSample2_1 frame = new SSample2_1("タイトル");
    frame.setVisible(true);
  }

  SSample2_1(String title){
    setTitle(title);
    setBounds(100, 100, 300, 250);
    setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

    JPanel p = new JPanel();

    JLabel label1 = new JLabel("今日の天気：");
    label1.setForeground(Color.BLUE);
    label1.setBackground(Color.BLACK);

    JLabel label2 = new JLabel("晴れのち曇り");
    label2.setForeground(Color.ORANGE);
    label2.setBackground(Color.WHITE);
    label2.setOpaque(true);

    p.add(label1);
    p.add(label2);

    Container contentPane = getContentPane();
    contentPane.add(p, BorderLayout.CENTER);
  }
}

setFont
public void setFont(Font font)

JLabel label = new JLabel("ラベル");

label.setFont(new Font("ＭＳ ゴシック", Font.BOLD, 16));

サンプルプログラム

import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JLabel;
import java.awt.Font;
import java.awt.Container;
import java.awt.BorderLayout;

class SSample3_1 extends JFrame{
  public static void main(String args[]){
    SSample3_1 frame = new SSample3_1("タイトル");
    frame.setVisible(true);
  }

  SSample3_1(String title){
    setTitle(title);
    setBounds(100, 100, 300, 250);
    setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

    JPanel p = new JPanel();

    JLabel label1 = new JLabel("今日の日付：");
    label1.setFont(new Font("ＭＳ ゴシック", Font.BOLD, 12));

    JLabel label2 = new JLabel("21 Sep. 2009");
    label2.setFont(new Font("Century", Font.ITALIC, 24));

    p.add(label1);
    p.add(label2);

    Container contentPane = getContentPane();
    contentPane.add(p, BorderLayout.CENTER);
  }
}

サイズの設定

setPreferredSize
public void setPreferredSize(Dimension preferredSize)

JLabel label = new JLabel("ラベル");

label.setPreferredSize(new Dimension(200, 100));

枠線の設定

setBorder
public void setBorder(Border border)

JLabel label = new JLabel("ラベル");

LineBorder border = new LineBorder(Color.RED, 2, true);
label.setBorder(border);

サンプルプログラム

import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JLabel;
import javax.swing.border.LineBorder;
import javax.swing.border.EtchedBorder;
import java.awt.Color;
import java.awt.Container;
import java.awt.BorderLayout;
import java.awt.Dimension;

class SSample4_1 extends JFrame{
  public static void main(String args[]){
    SSample4_1 frame = new SSample4_1("タイトル");
    frame.setVisible(true);
  }

  SSample4_1(String title){
    setTitle(title);
    setBounds(100, 100, 300, 250);
    setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

    JPanel p = new JPanel();

    JLabel label1 = new JLabel("今日の日付：");
    label1.setPreferredSize(new Dimension(100,100));
    label1.setBorder(new LineBorder(Color.BLUE, 8, true));

    JLabel label2 = new JLabel("21 Sep. 2009");
    label2.setPreferredSize(new Dimension(200,50));
    EtchedBorder border = new EtchedBorder(EtchedBorder.RAISED, Color.white, Color.black);
    label2.setBorder(border);

    p.add(label1);
    p.add(label2);

    Container contentPane = getContentPane();
    contentPane.add(p, BorderLayout.CENTER);
  }
}

水平方向の位置

setHorizontalAlignment
public void setHorizontalAlignment(int alignment)

JLabel.LEFT       左詰
JLabel.CENTER     中央(画像だけ表示する場合のデフォルト)
JLabel.RIGHT      右詰
JLabel.LEADING    左詰(文字だけ表示する場合のデフォルト)
JLabel.TRAILING   右詰

JLabel label = new JLabel("ラベル");

label.setHorizontalAlignment(JLabel.RIGHT);

垂直方向の位置

setVerticalAlignment
public void setVerticalAlignment(int alignment)

JLabel.TOP      上端
JLabel.CENTER   中央(デフォルト)
JLabel.BOTTOM   下端

JLabel label = new JLabel("ラベル");

label.setVerticalAlignment(JLabel.TOP);

サンプルプログラム

import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JLabel;
import javax.swing.border.LineBorder;
import java.awt.Color;
import java.awt.Container;
import java.awt.BorderLayout;
import java.awt.Dimension;

class SSample5_1 extends JFrame{
  public static void main(String args[]){
    SSample5_1 frame = new SSample5_1("タイトル");
    frame.setVisible(true);
  }

  SSample5_1(String title){
    setTitle(title);
    setBounds(100, 100, 300, 250);
    setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

    JPanel p = new JPanel();

    JLabel label1 = new JLabel("LEFT/TOP");
    label1.setPreferredSize(new Dimension(130,80));
    label1.setHorizontalAlignment(JLabel.LEFT);
    label1.setVerticalAlignment(JLabel.TOP);
    label1.setBorder(new LineBorder(Color.blue, 2, true));

    JLabel label2 = new JLabel("RIGHT/BOTTOM");
    label2.setPreferredSize(new Dimension(130,80));
    label2.setHorizontalAlignment(JLabel.RIGHT);
    label2.setVerticalAlignment(JLabel.BOTTOM);
    label2.setBorder(new LineBorder(Color.blue, 2, true));

    JLabel label3 = new JLabel("DEFAULT");
    label3.setPreferredSize(new Dimension(130,80));
    label3.setBorder(new LineBorder(Color.blue, 2, true));

    p.add(label1);
    p.add(label2);
    p.add(label3);

    Container contentPane = getContentPane();
    contentPane.add(p, BorderLayout.CENTER);
  }
}

JLabel
public JLabel(Icon image)

ImageIcon icon = new ImageIcon("./img/sample.png");
JLabel label = new JLabel(icon);

表示画像の設定

setIcon
public void setIcon(Icon icon)

JLabel label = new JLabel();

ImageIcon icon = new ImageIcon("./img/sample.png");
label.setIcon(icon);

サンプルプログラム

import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JLabel;
import javax.swing.ImageIcon;
import java.awt.Container;
import java.awt.BorderLayout;

class SSample6_1 extends JFrame{
  public static void main(String args[]){
    SSample6_1 frame = new SSample6_1("タイトル");
    frame.setVisible(true);
  }

  SSample6_1(String title){
    setTitle(title);
    setBounds(100, 100, 300, 250);
    setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

    JPanel p = new JPanel();

    ImageIcon icon1 = new ImageIcon("./board.png");
    ImageIcon icon2 = new ImageIcon("./hasami.png");

    JLabel label1 = new JLabel(icon1);

    JLabel label2 = new JLabel();
    label2.setIcon(icon2);

    p.add(label1);
    p.add(label2);

    Container contentPane = getContentPane();
    contentPane.add(p, BorderLayout.CENTER);
  }
}

ImageIcon icon = new ImageIcon("./img/sample.png");
JLabel label = new JLabel(icon);

label.setHorizontalAlignment(JLabel.LEFT);
label.setVerticalAlignment(JLabel.TOP);

サンプルプログラム

import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JLabel;
import javax.swing.ImageIcon;
import javax.swing.border.LineBorder;
import java.awt.Color;
import java.awt.Container;
import java.awt.BorderLayout;
import java.awt.Dimension;

class SSample7_1 extends JFrame{
  public static void main(String args[]){
    SSample7_1 frame = new SSample7_1("タイトル");
    frame.setVisible(true);
  }

  SSample7_1(String title){
    setTitle(title);
    setBounds(100, 100, 300, 250);
    setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

    JPanel p = new JPanel();

    ImageIcon icon1 = new ImageIcon("./board.png");
    ImageIcon icon2 = new ImageIcon("./hasami.png");
    ImageIcon icon3 = new ImageIcon("./bag.png");

    JLabel label1 = new JLabel(icon1);
    label1.setPreferredSize(new Dimension(100,100));
    label1.setHorizontalAlignment(JLabel.LEFT);
    label1.setVerticalAlignment(JLabel.TOP);
    label1.setBorder(new LineBorder(Color.blue, 2, true));

    JLabel label2 = new JLabel();
    label2.setIcon(icon2);
    label2.setPreferredSize(new Dimension(100,100));
    label2.setHorizontalAlignment(JLabel.RIGHT);
    label2.setVerticalAlignment(JLabel.BOTTOM);
    label2.setBorder(new LineBorder(Color.blue, 2, true));

    JLabel label3 = new JLabel(icon3);
    label3.setPreferredSize(new Dimension(100,100));
    label3.setBorder(new LineBorder(Color.blue, 2, true));

    p.add(label1);
    p.add(label2);
    p.add(label3);

    Container contentPane = getContentPane();
    contentPane.add(p, BorderLayout.CENTER);
  }
}

JLabel
public JLabel(String text, Icon icon, int horizontalAlignment)

JLabel.LEFT       左詰
JLabel.CENTER     中央
JLabel.RIGHT      右詰
JLabel.LEADING    左詰
JLabel.TRAILING   右詰

ImageIcon icon = new ImageIcon("./img/sample.png");
JLabel label = new JLabel("文字列", icon, JLabel.CENTER);

文字列が表示されているラベルに画像を設定する

JLabel label = new JLabel("文字列");

ImageIcon icon = new ImageIcon("./img/sample.png");
label.setIcon(icon);

画像が表示されているラベルに文字列を設定する

ImageIcon icon = new ImageIcon("./img/sample.png");
JLabel label = new JLabel(icon);

label.setText("文字列");

表示位置の指定

ImageIcon icon = new ImageIcon("./img/sample.png");
JLabel label = new JLabel(icon);

label.setText("文字列");

label.setHorizontalAlignment(JLabel.LEFT);
label.setVerticalAlignment(JLabel.TOP);

サンプルプログラム

import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JLabel;
import javax.swing.ImageIcon;
import javax.swing.border.LineBorder;
import java.awt.Color;
import java.awt.Container;
import java.awt.BorderLayout;
import java.awt.Dimension;

class SSample8_1 extends JFrame{
  public static void main(String args[]){
    SSample8_1 frame = new SSample8_1("タイトル");
    frame.setVisible(true);
  }

  SSample8_1(String title){
    setTitle(title);
    setBounds(100, 100, 400, 300);
    setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

    JPanel p = new JPanel();

    ImageIcon icon1 = new ImageIcon("./board.png");
    ImageIcon icon2 = new ImageIcon("./hasami.png");
    ImageIcon icon3 = new ImageIcon("./bag.png");
    ImageIcon icon4 = new ImageIcon("./dentaku.png");

    JLabel label1 = new JLabel("board", icon1, JLabel.LEFT);
    label1.setPreferredSize(new Dimension(180,120));
    label1.setBorder(new LineBorder(Color.blue, 2, true));

    JLabel label2 = new JLabel("hasami");
    label2.setIcon(icon2);
    label2.setPreferredSize(new Dimension(180,120));
    label2.setBorder(new LineBorder(Color.blue, 2, true));

    JLabel label3 = new JLabel(icon3);
    label3.setText("bag");
    label3.setPreferredSize(new Dimension(180,120));
    label3.setBorder(new LineBorder(Color.blue, 2, true));

    JLabel label4 = new JLabel(icon4);
    label4.setText("dentaku");
    label4.setPreferredSize(new Dimension(180,120));
    label4.setBorder(new LineBorder(Color.blue, 2, true));
    label4.setHorizontalAlignment(JLabel.RIGHT);
    label4.setVerticalAlignment(JLabel.BOTTOM);

    p.add(label1);
    p.add(label2);
    p.add(label3);
    p.add(label4);

    Container contentPane = getContentPane();
    contentPane.add(p, BorderLayout.CENTER);
  }
}

画像に対する文字列の水平位置

setHorizontalTextPosition
public void setHorizontalTextPosition(int textPosition)

JLabel.LEFT       左詰
JLabel.CENTER     中央
JLabel.RIGHT      右詰
JLabel.LEADING    左詰
JLabel.TRAILING   右詰 (デフォルト)

JLabel label = new JLabel();
labe.setText("文字列");
ImageIcon icon = new ImageIcon("./img/sample.png");
label.setIcon(icon);

label.setHorizontalTextPosition(JLabel.CENTER);

画像に対する文字列の垂直位置

setVerticalTextPosition
public void setVerticalTextPosition(int textPosition)

JLabel.TOP     上端に合わせる
JLabel.CENTER  中央(デフォルト)
JLabel.BOTTOM  下端に合わせる

JLabel label = new JLabel();
labe.setText("文字列");
ImageIcon icon = new ImageIcon("./img/sample.png");
label.setIcon(icon);

label.setVerticalTextPosition(JLabel.CENTER);

画像と文字列の間隔

setIconTextGap
public void setIconTextGap(int iconTextGap)

JLabel label = new JLabel();
labe.setText("文字列");
ImageIcon icon = new ImageIcon("./img/sample.png");
label.setIcon(icon);

label.setIconTextGap(10);

サンプルプログラム

import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JLabel;
import javax.swing.ImageIcon;
import javax.swing.border.LineBorder;
import java.awt.Color;
import java.awt.Container;
import java.awt.BorderLayout;
import java.awt.Dimension;

class SSample9_1 extends JFrame{
  public static void main(String args[]){
    SSample9_1 frame = new SSample9_1("タイトル");
    frame.setVisible(true);
  }

  SSample9_1(String title){
    setTitle(title);
    setBounds(100, 100, 350, 300);
    setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

    JPanel p = new JPanel();

    ImageIcon icon1 = new ImageIcon("./board.png");
    ImageIcon icon2 = new ImageIcon("./hasami.png");
    ImageIcon icon3 = new ImageIcon("./bag.png");
    ImageIcon icon4 = new ImageIcon("./dentaku.png");

    JLabel label1 = new JLabel("board", icon1, JLabel.CENTER);
    label1.setPreferredSize(new Dimension(100,80));
    label1.setBorder(new LineBorder(Color.blue, 2, true));
    label1.setHorizontalTextPosition(JLabel.LEFT);
    label1.setVerticalTextPosition(JLabel.TOP);

    JLabel label2 = new JLabel("board", icon1, JLabel.CENTER);
    label2.setPreferredSize(new Dimension(100,80));
    label2.setBorder(new LineBorder(Color.blue, 2, true));
    label2.setHorizontalTextPosition(JLabel.LEFT);
    label2.setVerticalTextPosition(JLabel.CENTER);

    JLabel label3 = new JLabel("board", icon1, JLabel.CENTER);
    label3.setPreferredSize(new Dimension(100,80));
    label3.setBorder(new LineBorder(Color.blue, 2, true));
    label3.setHorizontalTextPosition(JLabel.LEFT);
    label3.setVerticalTextPosition(JLabel.BOTTOM);

    JLabel label4 = new JLabel("board", icon2, JLabel.CENTER);
    label4.setPreferredSize(new Dimension(100,80));
    label4.setBorder(new LineBorder(Color.blue, 2, true));
    label4.setHorizontalTextPosition(JLabel.LEFT);
    label4.setVerticalTextPosition(JLabel.CENTER);

    JLabel label5 = new JLabel("board", icon2, JLabel.CENTER);
    label5.setPreferredSize(new Dimension(100,80));
    label5.setBorder(new LineBorder(Color.blue, 2, true));
    label5.setHorizontalTextPosition(JLabel.CENTER);
    label5.setVerticalTextPosition(JLabel.CENTER);

    JLabel label6 = new JLabel("board", icon2, JLabel.CENTER);
    label6.setPreferredSize(new Dimension(100,80));
    label6.setBorder(new LineBorder(Color.blue, 2, true));
    label6.setHorizontalTextPosition(JLabel.RIGHT);
    label6.setVerticalTextPosition(JLabel.CENTER);

    JLabel label7 = new JLabel("board", icon3, JLabel.CENTER);
    label7.setPreferredSize(new Dimension(150,80));
    label7.setBorder(new LineBorder(Color.blue, 2, true));

    JLabel label8 = new JLabel("board", icon3, JLabel.CENTER);
    label8.setPreferredSize(new Dimension(150,80));
    label8.setBorder(new LineBorder(Color.blue, 2, true));
    label8.setIconTextGap(20);

    p.add(label1);
    p.add(label2);
    p.add(label3);
    p.add(label4);
    p.add(label5);
    p.add(label6);
    p.add(label7);
    p.add(label8);

    Container contentPane = getContentPane();
    contentPane.add(p, BorderLayout.CENTER);
  }
}