質問編集履歴
1
エラーメッセージを追記
test
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エラーメッセージ
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Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
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at Item.RipoD.getStock(RipoD.java:40)//※3
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at Item.RipoD.addStock(RipoD.java:31)//※2
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at Item.RipoD.use(RipoD.java:25)//※1
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at Main.Main.actionPerformed(Main.java:388)//Mainクラスのrd.use(h);の部分
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```java
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public class ItemList {
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