How does java swing game programming make objects move continuously by pressing keys?

when I make an object move by holding down a key, the object usually moves one unit of distance, and then moves continuously in a certain unit. So, in the way of movement, there is often a time interval from a starting unit to a continuous unit, how to eliminate this time interval? So that the object can move continuously in any direction

Mar.01,2021

Game developers use the timeline to control animation. Time is divided into frames.
the frame rate is fixed, making the motion look coherent.

you should use speed and damping to control movement.

Speed is a loss and has a direction and a value.

damping is how long it takes to stop without pressing the key.

set a maximum speed, no matter how fast the key is pressed, it cannot exceed the maximum value.

modify the speed every time you receive a keystroke.

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