回答編集履歴
1
typo
answer
CHANGED
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@@ -48,5 +48,7 @@
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48
48
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@Override
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49
49
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public void paintComponent(Graphics g) {
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50
50
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Graphics2D g2 = (Graphics2D)g;
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51
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+
// g.drawLine(100, 100, 200, 200);
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52
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+
g2.draw(new Line2D.Double(100, 100, 200, 200));
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51
53
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52
54
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```
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