Encapsulation, inheritance, and polymorphism of Java's------class (IV)

Questions:

Declaring a color classColor. A color consists of (red, green, blue) ternary color values, calledRGBvalues. Aintintegers can represent a color, with the structure: the highest byte full1, followed by3bytes are stored in "red, green, blue" monochrome value, the monochrome value range is0~255. For example,0xff00ff00represents Green,RGBvalue is(0,255,0).

Declaring color colors class

RGB Color Value description See textbook experiment 3,RGB integer structure 3.4 , commonly used colors and their RGB values such as table 3-1 is shown.

Figure 1.1 Color RGB integer structure chart

Table 1-1 colors and their RGB values

Color	RGB Value	hexadecimal value of RGB	Java.awt.Color Constants
Red	(255,0,0)	0xffff0000	Color.Red
Green	(0,255,0)	0xff00ff00	Color.green
Blue	(0,0,255)	0xff0000ff	Color.Blue
Black	(0,0,0)	0xff000000	Color.Black
White	(255,255,255)	0xFFFFFFFF	Color.White

ColorThe main members of the color class are declared as follows, and then declare constants that represent red, green, blue, black, and white colors.

public class Color {                           //color class    private int value;                         Color value public color    (int red, int green, int blue)       //Construct color object in ternary color public    color (int RGB)                      //Construct Color object    in ternary color public int getRGB ()                      //returns the RGB value of the Color object public    int getred ()                       //Returns the red value of the Color object public    int Getgreen ()                     // Returns the green value of the Color object public    int getBlue ()                      //returns the blue value of the Color object public    string toString ()                   //Returns the string description of the Color object}

Code implementation:

Import java.util.*;p ublic class color{private int value;int red,green,blue;public Color (int red,int green,int blue) {This . Set (Red,green,blue); this.value=blue+ (green<<8) + (red<<16) + (255<<24);} Public Color (int rgb) {this.value=rgb;this.set (RGB);} public void set (int rgb) {this.blue=this.value&255;this.green= (this.value& (255<<8)) >>8; This.red= (this.value& (255<<16)) >>16;} public void Set (int red,int green,int blue) {this.red=red;this.green=green;this.blue=blue;} Public String getRGB () {return integer.tohexstring (this.value);} public int getred () {return this.red;} public int Getgreen () {return this.green;} public int GetBlue () {return this.blue;} Public String toString () {return "(red, green, blue) = = = (" +this.red+ "," +this.green+ "," +this.blue+ ")";}} Class Main{public static void Main (string[] args) {final int min=-16777216; Scanner sc=new Scanner (system.in); int a= (255<<24) + (255<<16) + (255<<8) +255;//system.out.println (" Please input N ("+a+" <=a<= "+ (255<<24) +") "); SYSTEM.OUT.PRINTLN ("Please input red, green and Blue's single color value"); System.out.println ("(0<=value <=255):"), while (Sc.hasnext ()) {color C=new color (sc.nextint (), Sc.nextint (), Sc.nextint ()); System.out.println (c); System.out.println ("RGB = 0x" +c.getrgb ()); System.out.println ("Red =" +c.getred ()); System.out.println ("Green =" +c.getgreen ()); System.out.println ("Blue =" +c.getblue ()); System.out.println ("-----------------"); SYSTEM.OUT.PRINTLN ("Please input n (" +min+ "<= n <=-1):"); c=new Color (Sc.nextint ()); System.out.println (c); System.out.println ("RGB = 0x" +c.getrgb ()); System.out.println ("Red =" +c.getred ()); System.out.println ("Green" +c.getgreen ()); System.out.println ("Blue =" +c.getblue ()); System.out.println (); SYSTEM.OUT.PRINTLN ("Please input red, green and Blue's single color value:");}}}

Encapsulation, inheritance, and polymorphism of Java's------class (IV)