Java中mouseListener和mouseMotionListener的区别？

Question

鼠标移动到组件上时,mouseMotionListener是否会触发事件,而只有按下按钮时,mouseListener才会触发？

所以如果我只有一个mousePressed事件,那么我不需要一个mouseMotionListener？只有我有一个mouseEntered或mouseExited？

Answer 1

是的,你是对的.mouseMotionListener用于在鼠标移过"热点"时执行操作

这里可以找到很好的例子

处理mousePressed事件时,您只需要mousePressed事件,除非您想要在鼠标悬停时添加更多要执行的事件.

Answer 2

他们听取不同的事件:

的MouseListener

mouseClicked(MouseEvent event)   // Called just after the user clicks the listened-to component.
mouseEntered(MouseEvent event)   // Called just after the cursor enters the bounds of the listened-to component.
mouseExited(MouseEvent event)    // Called just after the cursor exits the bounds of the listened-to component.
mousePressed(MouseEvent event)   // Called just after the user presses a mouse button while the cursor is over the listened-to component.
mouseReleased(MouseEvent event)  // Called just after the user releases a mouse button after a mouse press over the listened-to component

的MouseMotionListener

mouseDragged(MouseEvent event)   // Called in response to the user moving the mouse while holding a mouse button down. This event is fired by the component that fired the most recent mouse-pressed event, even if the cursor is no longer over that component.
mouseMoved(MouseEvent event)     // Called in response to the user moving the mouse with no mouse buttons pressed. This event is fired by the component that's currently under the cursor.

根据您追踪的事件添加侦听器.