Java Swing JFrame size different after upgrade to JRE11 from JRE 7 or 8. How can I make the frame size consistent? - Stack Overflow

从 JRE 7 或 8 升级到 JRE11 后，Java Swing JFrame 大小不同。如何使帧大小一致？ - IT工具网

设置虚拟机选项:-Dsun.java2d.uiScale=1.0

System.setProperty("sun.java2d.uiScale", "1.0");

1.0 = 100%

要再frame之前设置