用 updatUI(),会抛出异常!
java.lang.NullPointerException at javax.swing.plaf.basic.BasicTreeUI.updateSize(BasicTreeUI.java:1581) at javax.swing.plaf.basic.BasicTreeUI.toggleExpandState(BasicTreeUI.java:2023)不知道是否在updateUI()之前需要设置一些其他的信息??
java.lang.NullPointerException at javax.swing.plaf.basic.BasicTreeUI.updateSize(BasicTreeUI.java:1581) at javax.swing.plaf.basic.BasicTreeUI.toggleExpandState(BasicTreeUI.java:2023)不知道是否在updateUI()之前需要设置一些其他的信息??
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