的paintComponent心不是被調用，不能讓圖像變量工作

Question

，所以我知道我吸在編程，但如果ANY1可以給我一些代碼幫助，我將不勝感激，我不知道爲什麼我收到此錯誤

不能找到符號

g.drawImage(movPic2, 35, 515, 200, 200,this);    ^
    symbol: variable movPic2 
    location: class MovieDis 

如果any1可以給我一個代碼片段的例子，我很難理解用文字。 厭倦了這個程序，只是想完成它。

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

public class Movie extends JApplet { 

    private String movName1; 
    private String director1; 
    private int yearMade1; 
    private Image movPic1; 
    private String movName2; 
    private String director2; 
    private int yearMade2; 
    private Image movPic2; 
    private String movName3; 
    private String director3; 
    private int yearMade3; 
    private Image movPic3; 
    private String movName4; 
    private String director4; 
    private int yearMade4; 
    private Image movPic4; 

    public void init() { 
     MovieDis goo = new MovieDis(movPic1, movPic2, movPic3, movPic4); 
     goo.setBounds(0, 0, 750, 500); 
     add(goo); 
    } 
} 

class MovieDis extends JComponent { 

    private String movName1; 
    private String director1; 
    private int yearMade1; 
    private Image movPic1; 
    private String movName2; 
    private String director2; 
    private int yearMade2; 
    private Image movPic2; 
    private String movName3; 
    private String director3; 
    private int yearMade3; 
    private Image movPic3; 
    private String movName4; 
    private String director4; 
    private int yearMade4; 
    private Image movPic4; 

    public MovieDis(Image movPic1, Image movPic2, Image movPic3, Image movPic4) { 
     setBackground(Color.black); 
     movPic1 = Toolkit.getDefaultToolkit().createImage("Shaw.jpg"); 
     movPic2 = Toolkit.getDefaultToolkit().createImage("dances.jpg"); 
     movPic3 = Toolkit.getDefaultToolkit().getImage("Inception.jpg"); 
     movPic4 = Toolkit.getDefaultToolkit().getImage("Cuckoo.jpg"); 
    } 

    public void paintComponent(Graphics g) { 
     super.paintComponent(g); 
     g.setColor(Color.black); 
     g.fillRect(0, 0, 750, 500); 
     g.drawImage(movPic1, 35, 35, 200, 200, this); 
     g.drawImage(movPic2, 35, 515, 200, 200, this); 
     g.drawImage(movPic3, 265, 35, 200, 200, this); 
     g.drawImage(movPic4, 35, 515, 200, 200, this); 
    } 
} 

Answer 1

變量movPic1（2-4）是不是你MovieDis類的內部存儲在任何地方。這就是爲什麼paintComponent()方法抱怨。您需要將這些添加到MovieDis，然後將它們分配到您的類構造函數中。