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代码说明：

说明：  這是一個用JAVA所寫的簡單繪圖應用程式 JPanel為容器物件.pane1為畫布.pane2物件用來放置繪圖工具按鈕.pane3放置顏色按鈕(This is a book with a simple JAVA application mapping for the JPanel container object. Pane1 for the canvas. Pane2 object mapping tool used to place the button. Pane3 placed color button)