Question

这是我的代码我试图放一个图像，但每次，我在getimage（）部分有一个错误。你能帮忙吗？谢谢。我知道这是一个奇怪的项目。或者你能告诉我如何编写一个用于绘制圆形并将它们分成几部分的代码。每件作品都是不同的颜色然后我把它们放在一个链表中并询问用户他们讨厌哪种颜色然后我将其删除。我每次都做同样的事情，直到我只留下一种颜色。我不知道该怎么做，所以我用不同的方式做了，所以你可以帮助我：

import java.util.*;
import java.util.Scanner;
import javax.swing.*;
import java.applet.*; 
import java.awt.*; 
public class ExtraCredit extends Applet
{
//graphic
public void paintOr(Graphics g) 
{
Image img;
  MediaTracker tr;
 tr = new MediaTracker(this);
  img = getImage(getCodeBase(), "Or.png");
  tr.addImage(img,0);
  g.drawImage(img, 0, 0, this);
}
public void paintRed(Graphics g1) 
{
Image img;
  MediaTracker tr;
 tr = new MediaTracker(this);
  img = getImage(getCodeBase(), "red.png");
  tr.addImage(img,0);
  g1.drawImage(img, 0, 0, this);
}

public void paintR(Graphics g2) 
{
Image img;
  MediaTracker tr;
 tr = new MediaTracker(this);
  img = getImage(getCodeBase(), "R.png");
  tr.addImage(img,0);
  g2.drawImage(img, 0, 0, this);
}
public void paintRBrown(Graphics g3) 
{
Image img;
  MediaTracker tr;
 tr = new MediaTracker(this);
  img = getImage(getCodeBase(), "rbrown.png");
  tr.addImage(img,0);
  g3.drawImage(img, 0, 0, this);
}
public void paintBr(Graphics g4) 
{
Image img;
  MediaTracker tr;
 tr = new MediaTracker(this);
  img = getImage(getCodeBase(), "Br.png");
  tr.addImage(img,0);
  g4.drawImage(img, 0, 0, this);
}

public void paintBrBlue(Graphics g5) 
{
Image img;
  MediaTracker tr;
 tr = new MediaTracker(this);
  img = getImage(getCodeBase(), "brblue.png");
  tr.addImage(img,0);
  g5.drawImage(img, 0, 0, this);
}

     //----

   public static void main(String[] args)
   {
       ExtraCredit ex = new ExtraCredit();

      String cF;
       int i=0;
        LinkedList<String> c = new LinkedList<String>();
        c.add("red");
        c.add("brown");
        c.add("blue");
        c.add("green");
   Scanner scan = new Scanner (System.in);
   //first loop
   while(i!=4)
   {
   i++;
    System.out.println ("You have a list of color:brown, blue, green, red"); 
    Graphics g = ex.getGraphics();

  ex.paintOr(g);
    System.out.println ("which color you most hate:"); 
    String color1 = scan.nextLine();
     //cF=c.getFirst();

    if(color1 == c.getFirst())
    {
        Graphics g1 = ex.getGraphics();
  ex.paintRed(g1);
    }

    c.remove(color1);
    }
    i=0;

    // second loop
    while(i!=3)
    {
   i++;
    System.out.println ("You have a list of color:"+ c); 
    Graphics g2 =ex.getGraphics();
  ex.paintR(g2);
    System.out.println ("which color you most hate:"); 
    String color2 = scan.nextLine();
    if(color2 == c.getFirst())
    {
        Graphics g3 = ex.getGraphics();
  ex.paintRBrown(g3);
    }


    c.remove(color2);
    }

    i=0;
    //third loop
     while(i!=2)
    {
   i++;
    System.out.println ("You have a list of color:"+ c); 
    Graphics g4=ex.getGraphics();
  ex.paintBr(g4);
    System.out.println ("which color you most hate:"); 
    String color3 = scan.nextLine();
    cF=c.getFirst();
    if(color3 == c.getFirst())
    {
        System.out.println ("The color you like:" + c);
      Graphics g5 = ex.getGraphics();
  ex.paintBrBlue(g5);  
    }


    c.remove(color3);
    }



}

}

Answer 1

这个ex.getGraphics()是一个非常糟糕的主意。这不是在AWT或Swing中完成绘画的方式。

混合使用命令行输入和UI元素绝不是一个好主意，添加一个事实，即您使用Applet并且您的用户失去了实际提供反馈的能力......

AWT / Swing是事件驱动的环境。事件是从（主要）鼠标和键盘输入创建的。

请花些时间阅读Creating a GUI with Swing了解详情。

不要忘记查看Performing Custom Painting和2D Graphics，特别是有关形状的部分。

如何在java代码中放置图片？

1 个答案: