Java中mouseListener和mouseMotionListener的区别？

Question

mouseMotionListener 是否会在鼠标移到组件上时触发事件，而 mouseListener 只有在我按下按钮时才会触发？

所以如果我只有一个 mousePressed 事件，那么我不需要 mouseMotionListener 吗？只有当我有 mouseEntered 或 mouseExited 时？

Answer 1

是的，你是对的。 mouseMotionListener 用于在鼠标移到“热点”上时执行操作

很好的例子可以找到here

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

Answer 2

他们监听不同的事件：

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

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.

根据你所关注的事件添加监听器。