pieapplet2.java

里面包含了多个java的编程示例！而且举出初学者常常遇到的错误！

import java.awt.*;
import javax.swing.*;

public class PieApplet2 extends JApplet {

    public void init() {
        Container pane = getContentPane();
        int topSlice = 1;
        while (getParameter("color" + topSlice) != null) {
            topSlice++;
        }
        PiePanel pie = new PiePanel(topSlice);
        boolean noMoreSlices = false;
        int currentSlice = 0;
        while ((!noMoreSlices) & (currentSlice < topSlice)) {
            // get color
            String paramValue = getParameter("color" + currentSlice);
            if (paramValue == null) {
                noMoreSlices = true;
                continue;
            }
            String redValue = paramValue.substring(0, 2);
            int red = Integer.parseInt(redValue, 16);
            String greenValue = paramValue.substring(2, 4);
            int green = Integer.parseInt(greenValue, 16);
            String blueValue = paramValue.substring(4, 6);
            int blue = Integer.parseInt(blueValue, 16);
            Color sliceColor = new Color(red, green, blue);
            // get value
            String sliceValue = getParameter("slice" + currentSlice);
            int slice = Integer.parseInt(sliceValue);
            // add slice            
            pie.addSlice(sliceColor, slice);
            currentSlice++;
        }
        pane.add(pie);
        setContentPane(pane);
    }
}