我想在JPanel中显示多行JLabel。所以我有这段代码，但无法显示多行JLabel。publicclassNotificationFrameextendsJFrame{publicNotificationFrame(){JPanelpanelBody=newJPanel();panelBody.setBackground(Color.white);GridBagConstraintsGBC2=newGridBagConstraints();ContainerCR2=newContainer();GridBagLayoutGBL2=newGridBagLayout();CR2.set