Java by API/java.awt/Color

Color: equals(Object obj)

  
import java.awt.Color;
public class Main {
  public static void main(String[] a) {
    Color myBlack = new Color(0, 0, 0); // Color black
    Color myWhite = new Color(255, 255, 255); // Color white
    System.out.println(myBlack.equals(myWhite));
  }
}

Color: getComponents(float[] compArray)

  

import java.awt.Color;
import java.awt.image.ColorModel;
import java.awt.image.IndexColorModel;
public class Main {
  public static void main(String[] args) {
    byte ff = (byte) 0xff;
    byte[] r = { ff, 0, 0, ff, 0 };
    byte[] g = { 0, ff, 0, ff, 0 };
    byte[] b = { 0, 0, ff, ff, 0 };
    ColorModel cm = new IndexColorModel(3, 5, r, g, b);
    Color[] colors = { new Color(255, 0, 0), new Color(0, 255, 0),
        new Color(0, 0, 255), new Color(64, 255, 64),
        new Color(255, 255, 0), new Color(0, 255, 255) };
    for (int i = 0; i < colors.length; i++) {
      float[] normalizedComponents = colors[i].getComponents(null);
      int[] unnormalizedComponents = cm.getUnnormalizedComponents(
          normalizedComponents, 0, null, 0);
      int rgb = colors[i].getRGB();
      Object pixel = cm.getDataElements(rgb, null);
      System.out.println(colors[i] + " -> " + ((byte[]) pixel)[0]);
    }
    for (byte i = 0; i < 5; i++) {
      int[] unnormalizedComponents = cm.getComponents(i, null, 0);
      System.out.print(i + " -> unnormalized components");
      for (int j = 0; j < unnormalizedComponents.length; j++)
        System.out.print(" " + unnormalizedComponents[j]);
      System.out.println();
    }
  }
}

Color: getRGB()

   
import java.awt.Color;
import java.awt.image.ColorModel;
import java.awt.image.IndexColorModel;
public class MainClass {
  public static void main(String[] args) throws Exception {
    byte ff = (byte) 0xff;
    byte[] r = { ff, 0, 0, ff, 0 };
    byte[] g = { 0, ff, 0, ff, 0 };
    byte[] b = { 0, 0, ff, ff, 0 };
    ColorModel cm = new IndexColorModel(3, 5, r, g, b);
    Color[] colors = { new Color(255, 0, 0), new Color(0, 255, 0), new Color(0, 0, 255)};
    for (int i = 0; i < colors.length; i++) {
      int rgb = colors[i].getRGB();
      Object pixel = cm.getDataElements(rgb, null);
      System.out.println(colors[i] + " -> " + ((byte[]) pixel)[0]);
    }
    for (byte i = 0; i < 5; i++) {
      int[] unnormalizedComponents = cm.getComponents(i, null, 0);
      System.out.print(i + " -> unnormalized components");
      for (int j = 0; j < unnormalizedComponents.length; j++)
        System.out.print(" " + unnormalizedComponents[j]);
      System.out.println();
    }
  }
}

Color.GRAY

   
import java.awt.Color;
import java.awt.FlowLayout;
import java.awt.Font;
import javax.swing.JFrame;
import javax.swing.JLabel;
public class Main {
  public static void main(String[] args) {
    JFrame.setDefaultLookAndFeelDecorated(true);
    JFrame frame = new JFrame();
    frame.setTitle("JLabel Test");
    frame.setLayout(new FlowLayout());
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    JLabel label = new JLabel("First Name");
    label.setFont(new Font("Courier New", Font.ITALIC, 12));
    label.setForeground(Color.GRAY);
    frame.add(label);
    frame.pack();
    frame.setVisible(true);
  }
}

Color: HSBtoRGB(float hue,float saturation,float brightness)

   
import java.awt.Color;
import java.awt.Graphics;
import javax.swing.JFrame;
import javax.swing.JPanel;
public class MainClass extends JPanel {
  public void paint(Graphics g) {
    int n = 3;
    int xdata[] = new int[n];
    int ydata[] = new int[n];
    xdata[0] = 50;
    ydata[0] = 150;
    xdata[1] = 200;
    ydata[1] = 50;
    xdata[2] = 350;
    ydata[2] = 150;
    int rgb = Color.HSBtoRGB(1.0f, 1.0f, 1.0f);
    g.setColor(new Color(rgb));
    g.fillPolygon(xdata, ydata, n);
  }
  public static void main(String[] args) {
    JFrame frame = new JFrame();
    frame.getContentPane().add(new MainClass());
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.setSize(200, 200);
    frame.setVisible(true);
  }
}

Color.lightGray

   
import java.awt.Color;
import java.awt.Graphics;
import javax.swing.JFrame;
import javax.swing.JPanel;
public class MainClass extends JPanel {
  Color colors[] = { Color.black, Color.blue, Color.cyan, Color.darkGray,
      Color.gray, Color.green, Color.lightGray, Color.magenta, Color.orange,
      Color.pink, Color.red, Color.white, Color.yellow };
  public void paint(Graphics g) {
    int deltax = 260 / colors.length;
    for (int i = 0; i < colors.length; i++) {
      g.setColor(colors[i]);
      g.fillRect(i * deltax, 0, (i + 1) * deltax, 260);
    }
  }
  public static void main(String[] args) {
    JFrame frame = new JFrame();
    frame.getContentPane().add(new MainClass());
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.setSize(200, 200);
    frame.setVisible(true);
  }
}

Color.magenta

   
import java.awt.Color;
import java.awt.Graphics;
import javax.swing.JFrame;
import javax.swing.JPanel;
public class MainClass extends JPanel {
  Color colors[] = { Color.black, Color.blue, Color.cyan, Color.darkGray,
      Color.gray, Color.green, Color.lightGray, Color.magenta, Color.orange,
      Color.pink, Color.red, Color.white, Color.yellow };
  public void paint(Graphics g) {
    int deltax = 260 / colors.length;
    for (int i = 0; i < colors.length; i++) {
      g.setColor(colors[i]);
      g.fillRect(i * deltax, 0, (i + 1) * deltax, 260);
    }
  }
  public static void main(String[] args) {
    JFrame frame = new JFrame();
    frame.getContentPane().add(new MainClass());
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.setSize(200, 200);
    frame.setVisible(true);
  }
}

Color.pink

   
import java.awt.Color;
import java.awt.Graphics;
import javax.swing.JFrame;
import javax.swing.JPanel;
public class MainClass extends JPanel {
  Color colors[] = { Color.black, Color.blue, Color.cyan, Color.darkGray,
      Color.gray, Color.green, Color.lightGray, Color.magenta, Color.orange,
      Color.pink, Color.red, Color.white, Color.yellow };
  public void paint(Graphics g) {
    int deltax = 260 / colors.length;
    for (int i = 0; i < colors.length; i++) {
      g.setColor(colors[i]);
      g.fillRect(i * deltax, 0, (i + 1) * deltax, 260);
    }
  }
  public static void main(String[] args) {
    JFrame frame = new JFrame();
    frame.getContentPane().add(new MainClass());
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.setSize(200, 200);
    frame.setVisible(true);
  }
}

Color: RGBtoHSB(int r, int g, int b, float[] hsbvals)

  

import java.awt.Color;
public class Main {
  public static void main() {
    int red = 23;
    int green = 66;
    int blue = 99;
    float[] hsb = Color.RGBtoHSB(red, green, blue, null);
    float hue = hsb[0]; 
    float saturation = hsb[1];
    float brightness = hsb[2];
  }
}

new Color(int rgb)

  
import java.awt.Color;
import java.awt.Graphics;
import javax.swing.JComponent;
import javax.swing.JFrame;
class MyCanvas extends JComponent {
  Color[] colors = new Color[24];
  public MyCanvas() {
    int  rgb = 0xff;
    for (int i = 0; i < 24; i++) {
      colors[i] = new Color(rgb);
      rgb <<= 1;
      if ((rgb & 0x1000000) != 0) {
        rgb |= 1;
        rgb &= 0xffffff;
      }
    }
  }
  public void paint(Graphics g) {
    int i = 10;
    for (Color c : colors) {
      g.setColor(c);
      i += 10;
      g.drawLine(i, 10, 200, 200);
    }
  }
}
public class Main {
  public static void main(String[] a) {
    JFrame window = new JFrame();
    window.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    window.setBounds(30, 30, 300, 300);
    window.getContentPane().add(new MyCanvas());
    window.setVisible(true);
  }
}

new Color(int r, int g, int b)

  
import java.awt.BorderLayout;
import java.awt.Color;
import javax.swing.JButton;
import javax.swing.JFrame;
public class Main {
  public static void main(String args[]) {
    JFrame f = new JFrame("JColorChooser Sample");
    f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    final JButton button = new JButton("Pick to Change Background");
    Color myBlack = new Color(0,0,0);           // Color black
//    Color myWhite = new Color(255,255,255);     // Color white
  //  Color myGreen = new Color(0,200,0);         // A shade of green
    
    button.setBackground(myBlack);
    f.add(button, BorderLayout.CENTER);
    f.setSize(300, 200);
    f.setVisible(true);
  }
}