public class Color { public int gray(int color) { int r = color << 8 >>>24; int g = color <<16 >>> 24; int b =color<< 24 >>24; color = color & 0xFF000000; int gray =(r+g+b)/3; color = color | gray | (gray << 16) | (gray << 8); return color; } public static void main(String[] args) { Color op = new Color(); int color = op.gray(0xCC7B523D); System.out.println("0x" + Integer.toHexString(color).toUpperCase()); } }

这段代码是一个 Java 类 Color，其中包含一个名为 gray 的方法，其参数为一个 int 类型的 color。这个方法的作用是将这个颜色值转化为灰度值，并返回转化后的灰度值。具体实现方法是通过右移和与运算获取颜色值的 RGB 分量，然后将它们求平均值得到灰度值，并将灰度值设置为颜色的 R、G、B 分量，最后返回转化后的颜色值。在 main 方法中，实例化了一个 Color 对象 op，并调用其 gray 方法将颜色值 0xCC7B523D 转化为灰度值，最后将转化后的灰度值以十六进制字符串的形式输出到控制台。

相关问题

int i,b,k=0; for(i=1;i<=5;i++){ b=i%2; while(b-->=0) k++; printf("%d,%d", k,b);

代码

这是一个基本的Java代码示例，用于提交照片和数据，并生成曲线图。

import java.awt.Color;
import java.awt.Dimension;
import java.awt.Font;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import javax.imageio.ImageIO;
import javax.swing.JFrame;
import org.jfree.chart.ChartFactory;
import org.jfree.chart.ChartPanel;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.axis.NumberAxis;
import org.jfree.chart.plot.PlotOrientation;
import org.jfree.chart.plot.XYPlot;
import org.jfree.chart.renderer.xy.XYLineAndShapeRenderer;
import org.jfree.data.xy.XYDataset;
import org.jfree.data.xy.XYSeries;
import org.jfree.data.xy.XYSeriesCollection;

public class PhotoDataGrapher {

    private static final int WIDTH = 800;
    private static final int HEIGHT = 600;

    public static void main(String[] args) throws IOException {
        // Load photo and data
        File photoFile = new File("photo.jpg");
        BufferedImage photo = ImageIO.read(photoFile);
        List<Double> data = loadData("data.txt");

        // Create chart
        JFreeChart chart = createChart(data);
        ChartPanel chartPanel = new ChartPanel(chart);
        chartPanel.setPreferredSize(new Dimension(WIDTH, HEIGHT));

        // Display chart
        JFrame frame = new JFrame("Photo Data Grapher");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setContentPane(chartPanel);
        frame.pack();
        frame.setVisible(true);

        // Save chart as image
        File chartFile = new File("chart.png");
        BufferedImage chartImage = chart.createBufferedImage(WIDTH, HEIGHT);
        ImageIO.write(chartImage, "png", chartFile);
    }

    private static List<Double> loadData(String filename) throws IOException {
        List<Double> data = new ArrayList<>();
        File dataFile = new File(filename);
        Scanner scanner = new Scanner(dataFile);
        while (scanner.hasNextDouble()) {
            double value = scanner.nextDouble();
            data.add(value);
        }
        scanner.close();
        return data;
    }

    private static JFreeChart createChart(List<Double> data) {
        // Create dataset
        XYSeries series = new XYSeries("Data");
        for (int i = 0; i < data.size(); i++) {
            double value = data.get(i);
            series.add(i, value);
        }
        XYDataset dataset = new XYSeriesCollection(series);

        // Create chart
        JFreeChart chart = ChartFactory.createXYLineChart(
            "Photo Data",
            "Index",
            "Value",
            dataset,
            PlotOrientation.VERTICAL,
            true,
            true,
            false
        );

        // Set chart properties
        chart.setBackgroundPaint(Color.WHITE);
        chart.getTitle().setFont(new Font("SansSerif", Font.BOLD, 18));
        chart.getLegend().setItemFont(new Font("SansSerif", Font.PLAIN, 12));

        // Set plot properties
        XYPlot plot = chart.getXYPlot();
        plot.setBackgroundPaint(Color.WHITE);
        plot.setDomainGridlinePaint(Color.LIGHT_GRAY);
        plot.setRangeGridlinePaint(Color.LIGHT_GRAY);

        // Set axis properties
        NumberAxis domainAxis = (NumberAxis) plot.getDomainAxis();
        domainAxis.setAutoRangeIncludesZero(false);
        domainAxis.setTickLabelFont(new Font("SansSerif", Font.PLAIN, 12));
        NumberAxis rangeAxis = (NumberAxis) plot.getRangeAxis();
        rangeAxis.setAutoRangeIncludesZero(false);
        rangeAxis.setTickLabelFont(new Font("SansSerif", Font.PLAIN, 12));

        // Set renderer properties
        XYLineAndShapeRenderer renderer = (XYLineAndShapeRenderer) plot.getRenderer();
        renderer.setSeriesPaint(0, Color.BLUE);
        renderer.setSeriesStroke(0, new BasicStroke(2.0f));

        return chart;
    }
}

该代码首先加载文件中的照片和数据，然后创建一个JFreeChart图表，该图表显示数据的曲线。最后，该程序将图表显示在JFrame中，并将图表保存为PNG图像。

package forth; interface ShapeArea { double PI =3.1415926; double area (); } interface ShapeColor { int BLACK =0, BLUE =1, GREEN =2, CYAN =3, RED =4, MAGENTA =5, LIGHT_YELLOW =6, LIGHT_GRAY =7, DARK_GRAY =8, LIGHT_BLUE =9, LIGH_GREEN =19, LIGHT_CYAN =11, LIGHT_RED =12, LIGHT_MAGENTA =13, YELLOW =14, WHITE =15; } class Circle implements ShapeArea , ShapeColor { double radius ; int color ; Circle ( double r , int c) { radius =( r >=0.0f ? r :0.0f); color = c ; } public double area () { return PI * radius * radius ;} } public class five{ static String [] colArray ={ " BLACK ","BLUE ","GREEN ","CYAN "," RED "," MAGENTA ", " LIGHT _ YELLOW "," LIGHT _ GRAY "," DARK _ GRAY "," LIGHT _ BLUE "," LIGHT _ GREEN "," LIGHT CYAN "," LIGHT RED ", " LIGHT MAGENTA "," YELLOW "," WHITE "}; public static void main ( String [] args ){ Circle cir1 = new Circle (5, ShapeColor . BLUE ); Circle cir2= new Circle (7, ShapeColor . GREEN ); Circle cir3 = new Circle (4, ShapeColor . MAGENTA ); System.out.println (" cir1's Area ="+cir1.area()+",color ="+ colArray [cir1.color]); System.out.println ("cir2's Area ="+cir2.area()+", color ="+ colArray [cir2.color]); System.out.println ("cir3's Area ="+cir3.area()+", color ="+ colArray [cir3.color]); } }简单解释一下

这是一个 Java 代码示例，定义了两个接口 ShapeArea 和 ShapeColor，以及一个 Circle 类实现了这两个接口。ShapeArea 接口定义了一个常量 PI 和一个抽象方法 area()，表示计算图形的面积。ShapeColor 接口定义了一些常量，表示颜色。Circle 类有两个属性：半径和颜色，以及一个构造方法初始化这两个属性。Circle 类还实现了 ShapeArea 和 ShapeColor 接口，并实现了 area() 方法。five 类中包含一个 main 方法，创建了三个 Circle 对象，并输出它们的面积和颜色。