你能糾正我在這段代碼中犯的錯誤嗎？

-3

使用getPixel（2，3）使setColor（java.awt.Color.Black）變爲黑色，然後用show（）顯示圖片提示：您必須聲明並使用圖片參考變量，代碼如圖片p。你能糾正我在這段代碼中犯的錯誤嗎？

public static void main(String[] a) 
{ 
    new Picture(FileChooser.pickAFile(); 
}

這是我的答案，任何人都可以告訴我，如果這是正確的，如果我需要做出任何改變？任何幫助，將不勝感激。此外，這不是一個問題，即時審查考試。所以如果你打算告訴我去做自己的事，不要麻煩回答。 :)

public static void main(String[] a) 
{ 
    Picture p = new Picture; 
    new Picture(FileChooser.pickAFile(); 
    Pixel pixRef; 
    pixRef.getPixel(2,3); 
    pixRef.setColor(java.awt.Color.Black); 
    p.show(); 
}

來源

2013-05-17 Invis

第一個代碼..加上「）」 – matzone

你使用的是編輯器嗎？如果沒有，你應該考慮使用一個。你在''新圖片（FileChooser.pickAFile（）' – Bill

'）末尾丟失了'''什麼是圖片和像素類？ – Craig

，你就會失敗考試這樣。

public static void main(String[] a) 
{ 
    Picture p; // constructor is a method - but seems you instantiate it in next line 
    p =new Picture(FileChooser.pickAFile()); // assign it to p 
    Pixel pixRef = new Pixel(); //avoid nullpointerexception! but logically you should get the pixel from the picture, which displayed in next line, can remove the "new Pixel()"; 
    pixRef = p.getPixel(2,3); // Shouldn't you get pixelref from picture? 
    pixRef.setColor(java.awt.Color.Black); 
    p.show(); // I don't understand this. Where do you show this? shouldn't you put it inside a Frame or something? 
}

來源

2013-05-17 03:46:14 Rudy

如果您將其引用到p，則無需創建新的像素.getPixel後面的行。 – Lynch

你是對的@Lynch，但是我也想在原代碼中顯示錯誤。 – Rudy

是的，我明白了，這樣保持。 – Lynch

public static void main(String[] a) 
{ 

Picture p = new Picture; //what are you trying to call here? you must try checking out how to create an object it must be "Picture p = new Picture();" , and if you have just defined a parameterised constructor in Picture class and need an object of that directly do it this was 
"Picture p = new Picture(FileChooser.pickAFile()); 

new Picture(FileChooser.pickAFile()); // must be enclosed properly 
Pixel pixRef; 
pixRef.getPixel(2,3); // must be initialized before using the instance methods "Pixel pixRef = new Pixel();" 
pixRef.setColor(java.awt.Color.Black); 
p.show(); 
}

來源

2013-05-17 03:42:31

你能糾正我在這段代碼中犯的錯誤嗎？

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