1

私はJavaを初めて使用し、アプレットを作成しています。描画関数を使用して何も描画できないという問題が発生しました。私のコードは完璧ではないことは知っていますが、助けていただければ幸いです。

これは私のコードです:

import java.applet.Applet;
import java.awt.Graphics;
import java.awt.Image;
import java.awt.Color;

public class CardsJavaProgram extends Applet {

    public void init(){
    this.setBackground( Color.blue );

    }
    public void paint( Graphics screen ){
    int x = 10;
    int y = 10;
    int x2 = 10;
    int y2 = 110;
        Image c1 = getImage ( getDocumentBase (), "cards/c1.gif" );
        Image c2 = getImage ( getDocumentBase (), "cards/c2.gif" );
        Image c3 = getImage ( getDocumentBase (), "cards/c3.gif" );
        Image c4 = getImage ( getDocumentBase (), "cards/c4.gif" );
        Image c5 = getImage ( getDocumentBase (), "cards/c5.gif" );
        Image c6 = getImage ( getDocumentBase (), "cards/c6.gif" );
        Image c7 = getImage ( getDocumentBase (), "cards/c7.gif" );
        Image c8 = getImage ( getDocumentBase (), "cards/c8.gif" );
        Image c9 = getImage ( getDocumentBase (), "cards/c9.gif" );
        Image c10 = getImage ( getDocumentBase (), "cards/c10.gif" );
        Image cj = getImage ( getDocumentBase (), "cards/cj.gif" );
        Image cq = getImage ( getDocumentBase (), "cards/cq.gif" );
        Image ck = getImage ( getDocumentBase (), "cards/ck.gif" );
        Image h1 = getImage ( getDocumentBase (), "cards/h1.gif" );
        Image h2 = getImage ( getDocumentBase (), "cards/h2.gif" );
        Image h3 = getImage ( getDocumentBase (), "cards/h3.gif" );
        Image h4 = getImage ( getDocumentBase (), "cards/h4.gif" );
        Image h5 = getImage ( getDocumentBase (), "cards/h5.gif" );
        Image h6 = getImage ( getDocumentBase (), "cards/h6.gif" );
        Image h7 = getImage ( getDocumentBase (), "cards/h7.gif" );
        Image h8 = getImage ( getDocumentBase (), "cards/h8.gif" );
        Image h9 = getImage ( getDocumentBase (), "cards/h9.gif" );
        Image h10 = getImage ( getDocumentBase (), "cards/h10.gif" );
        Image hj = getImage ( getDocumentBase (), "cards/hj.gif" );
        Image hq = getImage ( getDocumentBase (), "cards/hq.gif" );
        Image hk = getImage ( getDocumentBase (), "cards/hk.gif" );
        Image d1 = getImage ( getDocumentBase (), "cards/d1.gif" );
        Image d2 = getImage ( getDocumentBase (), "cards/d2.gif" );
        Image d3 = getImage ( getDocumentBase (), "cards/d3.gif" );
        Image d4 = getImage ( getDocumentBase (), "cards/d4.gif" );
        Image d5 = getImage ( getDocumentBase (), "cards/d5.gif" );
        Image d6 = getImage ( getDocumentBase (), "cards/d6.gif" );
        Image d7 = getImage ( getDocumentBase (), "cards/d7.gif" );
        Image d8 = getImage ( getDocumentBase (), "cards/d8.gif" );
        Image d9 = getImage ( getDocumentBase (), "cards/d9.gif" );
        Image d10 = getImage ( getDocumentBase (), "cards/d10.gif" );
        Image dj = getImage ( getDocumentBase (), "cards/dj.gif" );
        Image dq = getImage ( getDocumentBase (), "cards/dq.gif" );
        Image dk = getImage ( getDocumentBase (), "cards/dk.gif" );
        Image s1 = getImage ( getDocumentBase (), "cards/s1.gif" );
        Image s2 = getImage ( getDocumentBase (), "cards/s2.gif" );
        Image s3 = getImage ( getDocumentBase (), "cards/s3.gif" );
        Image s4 = getImage ( getDocumentBase (), "cards/s4.gif" );
        Image s5 = getImage ( getDocumentBase (), "cards/s5.gif" );
        Image s6 = getImage ( getDocumentBase (), "cards/s6.gif" );
        Image s7 = getImage ( getDocumentBase (), "cards/s7.gif" );
        Image s8 = getImage ( getDocumentBase (), "cards/s8.gif" );
        Image s9 = getImage ( getDocumentBase (), "cards/s9.gif" );
        Image s10 = getImage ( getDocumentBase (), "cards/s10.gif" );
        Image sj = getImage ( getDocumentBase (), "cards/sj.gif" );
        Image sq = getImage ( getDocumentBase (), "cards/sq.gif" );
        Image sk = getImage ( getDocumentBase (), "cards/sk.gif" );

        Image [] cards = new Image [ 52 ];
        cards [ 0 ] = c1;
        cards [ 1 ] = c2;
        cards [ 2 ] = c3;
        cards [ 3 ] = c4;
        cards [ 4 ] = c5;
        cards [ 5 ] = c6;
        cards [ 6 ] = c7;
        cards [ 7 ] = c8;
        cards [ 8 ] = c9;
        cards [ 9 ] = c10;
        cards [ 10 ] = cj;
        cards [ 11 ] = cq;
        cards [ 12 ] = ck;
        cards [ 13 ] = h1;
        cards [ 14 ] = h2;
        cards [ 15 ] = h3;
        cards [ 16 ] = h4;
        cards [ 17 ] = h5;
        cards [ 18 ] = h6;
        cards [ 19 ] = h7;
        cards [ 20 ] = h8;
        cards [ 21 ] = h9;
        cards [ 22 ] = h10;
        cards [ 23 ] = hj;
        cards [ 24 ] = hq;
        cards [ 25 ] = hk;
        cards [ 26 ] = d1;
        cards [ 27 ] = d2;
        cards [ 28 ] = d3;
        cards [ 29 ] = d4;
        cards [ 30 ] = d5;
        cards [ 31 ] = d6;
        cards [ 32 ] = d7;
        cards [ 33 ] = d8;
        cards [ 34 ] = d9;
        cards [ 35 ] = d10;
        cards [ 36 ] = dj;
        cards [ 37 ] = dq;
        cards [ 38 ] = dk;
        cards [ 39 ] = s1;
        cards [ 40 ] = s2;
        cards [ 41 ] = s3;
        cards [ 42 ] = s4;
        cards [ 43 ] = s5;
        cards [ 44 ] = s6;
        cards [ 45 ] = s7;
        cards [ 46 ] = s8;
        cards [ 47 ] = s9;
        cards [ 48 ] = s10;
        cards [ 49 ] = sj;
        cards [ 50 ] = sq;
        cards [ 51 ] = sk;
    screen.drawImage( getImage ( getDocumentBase (), "cards/c1.gif" ), 100, 100, this );
    screen.drawImage( getImage ( getDocumentBase (), "cards/c1.gif" ), 10, 10, this );
    screen.drawImage( getImage ( getDocumentBase (), "cards/c1.gif" ), 50, 50, this );
    screen.drawString( " test ", 10, 10, this );
    /*for (int i = 0; i < 4; i++){
        screen.drawImage (cards[( int ) ( float ) Math.random () * 52 - 1], x, y, this);
        x = x + 5;
    }
    for (int i = 0; i < 4; i++){
        screen.drawImage (cards [( int ) ( float ) ( Math.random () ) * 52 - ( int ) ( 1 )], x2, y2, this);
        x = x + 10;
    }*/
    }





}

インデックスを作成しましたが、すべてのファイルが適切な場所にあります。

4

4 に答える 4

3
Image c1 = getImage ( getDocumentBase (), "cards/c1.gif" );

これらの行はpaint(Graphics)メソッド内にあります。ペイントでI/Oやその他の時間のかかるタスク(「画像でいっぱいのデッキ」をロードするなど)を実行しようとしないでください。

画像は、次のようなクラス属性として宣言する必要があります(メソッドの外部で宣言する)。

Image c1;

次に、にロードされinit()ます。

c1 = getImage ( getDocumentBase (), "cards/c1.gif" );
于 2012-09-21T23:49:58.423 に答える
1

ハードコードされた値を避けるために、コードを修正することをお勧めします。

ペイントメソッド自体を定義するアプレットクラスを拡張しているので、最初にベースペイントメソッドを呼び出す必要がsuper.paint(screen)あります。また、そこに到達している画像を実際にロードしているかどうかを確認することをお勧めします。

また、アプレットでよくあるエラーは、クラスがロードされていないことです。Javaコンソールを調べて、ローダーエラーがないかどうかを確認してください。アドバイスとして、これをFrameアプリケーションにして、後で次のように変換できます。アプレット。

于 2012-09-21T23:55:24.913 に答える
-1
Image picture;  
picture = getImage(getDocumentBase(),"sonoo.jpg");  
g.drawImage(picture, 30,30, this);  
于 2014-03-20T14:53:07.673 に答える