该文档明确指出，通过showXXXDialog方法创建的所有对话框都是模态的。
您可以使用的是直接使用的方法（该方法来自docs）以及JDialog继承自Dialog
的setModal方法：
JOptionPane pane = new JOptionPane(arguments); // Configure via set methods JDialog dialog = pane.createDialog(parentComponent, title); // the line below is added to the example from the docs dialog.setModal(false); // this says not to block background components dialog.show(); Object selectedValue = pane.getValue(); if(selectedValue == null) return CLOSED_OPTION; //If there is not an array of option buttons: if(options == null) { if(selectedValue instanceof Integer) return ((Integer)selectedValue).intValue(); return CLOSED_OPTION; } //If there is an array of option buttons: for(int counter = 0, maxCounter = options.length; counter < maxCounter; counter++) { if(options[counter].equals(selectedValue)) return counter; } return CLOSED_OPTION;
