質問編集履歴
3
条件の追加
test
CHANGED
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File without changes
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test
CHANGED
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@@ -3,6 +3,8 @@
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3
3
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4
4
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5
5
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JSliderを使って0から255の間を動かせるスライダーを作りたい。
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6
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+
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7
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+
JColorChooserは使えないということでお願いします。
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6
8
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7
9
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8
10
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2
エラーメッセージの変更
test
CHANGED
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File without changes
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test
CHANGED
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@@ -12,17 +12,11 @@
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12
12
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13
13
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```
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14
14
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15
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-
Exception in thread "main" java.lang.
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15
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+
Exception in thread "main" java.lang.NullPointerException: Cannot invoke "javax.swing.JPanel.add(java.awt.Component)" because "this.panel" is null
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16
16
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17
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-
at
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17
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+
at MainFrame.<init>(ColorFrame.java:50)
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18
18
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19
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-
at java.desktop/java.awt.Container.addImpl(Container.java:1116)
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20
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-
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21
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-
at java.desktop/java.awt.Container.add(Container.java:437)
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22
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-
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23
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-
at MainFrame.<init>(slidertest.java:28)
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24
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-
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25
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-
at MainFrame.main(
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19
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+
at MainFrame.main(ColorFrame.java:64)
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26
20
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27
21
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```
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28
22
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1
JPanelに変更しました。
test
CHANGED
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File without changes
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test
CHANGED
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@@ -46,7 +46,7 @@
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46
46
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47
47
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48
48
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49
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-
class SliderPanel extends JFrame
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49
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+
class SliderPanel extends JPanel { // JFrame -> JPanelに変更しました
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50
50
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51
51
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JSlider rSlider;
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52
52
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|