Question

当我尝试运行该类时，无法弄清给我的错误消息

当我尝试运行该类时，出现以下错误代码：

Error: Could not find or load main class sun.applet.AppletViewer
Caused by: java.lang.ClassNotFoundException: 
    sun.applet.AppletViewer

我包括了整个班级及其所有组成部分。

我已经获得了完全相同的代码，可以在jGrasp中完美运行，但是我试图跳转到intelliJ，我不知道为什么我会得到具有相同完全代码的错误代码。我很清楚Applet方法/类已被弃用，并且在jGrasp中似乎无关紧要。

仅供参考：该代码的目的是创建一个applet，该applet从头开始绘制一堆东西，而不是绘制实际图像。

import java.awt.*;
import java.applet.*;
import java.util.*;

@SuppressWarnings("deprecated")
public class ree extends Applet
{

int width, height;
Random rand = new Random();

public void init()
{
    width = getSize().width;
    height = getSize().height;
}

@Override
public void paint(Graphics g)
{
    // Draw Grid
    g.drawRect(10,10,780,580);
    g.drawLine(400,10,400,590);
    g.drawLine(10,300,790,300);

    // Draw Random Lines
    for (int i = 0; i < 100; ++i)
    {
        int x1 = rand.nextInt(400); //int x1 = rand.nextInt(maxvalue); creates a random point on applet with value no greater than 400
        int y1 = rand.nextInt(300);
        int x2 = rand.nextInt(400);
        int y2 = rand.nextInt(300);

        float r = rand.nextFloat(); //creates a new color
        float gr = rand.nextFloat();
        float b = rand.nextFloat();

        Color randomColor = new Color (r,gr,b);
        g.setColor(randomColor);

        g.drawLine(x1,y1,x2,y2);
    }

    // Draw Random Squares
    for (int i = 0; i < 100; ++i)
    {
        int sx1 = rand.nextInt(350)+400;
        int sy1 = rand.nextInt(250);

        float sr = rand.nextFloat();
        float sgr = rand.nextFloat();
        float sb = rand.nextFloat();

        Color squareColors = new Color (sr, sgr, sb);
        g.setColor(squareColors);

        g.fillRect(sx1, sy1, 50, 50);
    }

    // Draw Random Circles
    for (int i = 0; i < 100; ++i)
    {
        int cx1 = rand.nextInt(300);
        int cy1 = rand.nextInt(225)+300;
        int dim = rand.nextInt(100);

        float cr = rand.nextFloat();
        float cgr = rand.nextFloat();
        float cb = rand.nextFloat();

        Color circleColors = new Color (cr, cgr, cb);
        g.setColor(circleColors);

        g.drawOval(cx1, cy1, dim, dim);
    }

    // Draw 3-D Box
    Polygon leftSide = new Polygon();
    leftSide.addPoint(600, 400);
    leftSide.addPoint(600, 500);
    leftSide.addPoint(550, 450);
    leftSide.addPoint(550, 350);
    g.setColor(Color.GREEN);
    g.fillPolygon(leftSide);

    Polygon backSide = new Polygon();
    backSide.addPoint(600, 400);
    backSide.addPoint(550, 350);
    backSide.addPoint(650, 350);
    backSide.addPoint(650, 400);
    g.setColor(Color.YELLOW);
    g.fillPolygon(backSide);

    Polygon rightSide = new Polygon();
    rightSide.addPoint(700, 400);
    rightSide.addPoint(650, 400);
    rightSide.addPoint(650, 350);
    g.setColor(Color.BLUE);
    g.fillPolygon(rightSide);

    g.setColor(Color.RED);
    g.fillRect(600, 400, 100, 100);
}
}

Java：如何在intellij中使用图形？

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