colorscribble.java

java 的164个例子的源代码,包括了 很多方面,供包括了19个方面的 源代码

/*
 * Copyright (c) 2000 David Flanagan.  All rights reserved.
 * This code is from the book Java Examples in a Nutshell, 2nd Edition.
 * It is provided AS-IS, WITHOUT ANY WARRANTY either expressed or implied.
 * You may study, use, and modify it for any non-commercial purpose.
 * You may distribute it non-commercially as long as you retain this notice.
 * For a commercial use license, or to purchase the book (recommended),
 * visit http://www.davidflanagan.com/javaexamples2.
 */
package com.davidflanagan.examples.applet;
import java.applet.*;
import java.awt.*;

/**
 * A version of the Scribble applet that reads two applet parameters
 * to set the foreground and background colors.  It also returns
 * information about itself when queried.
 **/
public class ColorScribble extends Scribble {
    // Read in two color parameters and set the colors.
    public void init() {
        super.init();  // Let the superclass initialize itself
        Color foreground = getColorParameter("foreground");
        Color background = getColorParameter("background");
        if (foreground != null) this.setForeground(foreground);
        if (background != null) this.setBackground(background);
    }

    // Read the specified parameter.  Interpret it as a hexadecimal
    // number of the form RRGGBB and convert it to a color.
    protected Color getColorParameter(String name) {
        String value = this.getParameter(name);
        try { return new Color(Integer.parseInt(value, 16)); }
        catch (Exception e) { return null; }
    }

    // Return information suitable for display in an About dialog box.
    public String getAppletInfo() {
        return "ColorScribble v. 0.03.  Written by David Flanagan.";
    }

    // Return info about the supported parameters.  Web browsers and applet
    // viewers should display this information, and may also allow users to
    // set the parameter values.
    public String[][] getParameterInfo() { return info; }

    // Here's the information that getParameterInfo() returns.
    // It is an array of arrays of strings describing each parameter.
    // Format: parameter name, parameter type, parameter description
    private String[][] info = {
        {"foreground", "hexadecimal color value", "foreground color"},
        {"background", "hexadecimal color value", "background color"}
    };
}