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[JAVA] how to move the triangle by timer

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Hi guys, for the code below i managed to make the rectangle moved to the left and bounce back at jpanel width.  But how to make the triangle move horizontally (doesnt matter to the left or right) ? Before this i can make the triangle move by pinpoint the triangle coordinate point by using {..triangle.addPoint(x, y)...}  . but when i used to make the triangle using constructor and arrays, how can i make the triangle move by TIMER? What need i do with the x1 and velx1 variable?

Thank you

Consider Paul's rocket mass heater.
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