請問java怎樣客製化button?

我用class button1 extends JButton{/////用JBUTTON來客製化

public void paintComponent(Graphics g){
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}

}

那可否用class button1 extends Button{{/////用BUTTON來客製化

要怎麼寫?例如寫一個有圖形a.jpg的Button object上

public void paintComponent(Graphics g){/////此時沒辦法interface
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}

}

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sgarda