1.右键项目-》build path -》configure build path
2.在弹出的窗口选择libraries
3.选中JRE System Libraries 后点击右下角的edit
4.Execution environment 选择 javaSE-1.7
1.右键项目-》build path -》configure build path
2.在弹出的窗口选择libraries
3.选中JRE System Libraries 后点击右下角的edit
4.Execution environment 选择 javaSE-1.7
本文标题：java package javax.swing is not
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