不知道您的两个答案中的哪个将被删除，但是这里又是相同的答案。请注意，您可以使用循环创建所有JComboBoxes和选项，以防止真正冗长的重复代码。然后，您可以使用getSource（）方法来判断事件来自哪个组合框。如果将JComboBoxes创建为数组，则可以非常清晰地循环遍历它们。为了重新添加内容，我只需要跟踪已选择的内容以及使用String数组的组合框。然后，您可以检查此数组，并根据需要使用它来添加项目。请注意，它们不会以相同的顺序返回。如果您想要该功能，则可以使用insertItemAt，但这可能会有些混乱（因为自从添加和删除项以来索引一直在变化），因此我将其省略。
//Declare and initialize the options that the comboboxes will haveString[] options = {"-Select-", "Item 1", "Item 2", "Item 3", "Item 4"};//Declare and initialize an array that will hold the currently selected options in each combobox by index//For example the currently selected value of comboBoxes[1] is selected[1]String[] selected = {"-Select-", "-Select-", "-Select-", "-Select-"};//Declare and initialize an array of comboBoxes. //Four comboboxes will be created all containing the options arrayJComboBox[] comboBoxes = new JComboBox[4];for(int i = 0; i < comboBox.length; i++) { comboBoxes[i] = new JComboBox(options);}private void jComboBox1ItemStateChanged(java.awt.event.ItemEvent evt) { //Loop through all of the comboboxes in comboBoxes for(int i = 0; i < comboBoxes.length; i++) { //Check to see if the current combobox in the array matches the source of your event if(evt.getSource() == comboBoxes[i]) { //Get the string value of the combobox that fired the event String currentSelection = (String)comboBoxes[i].getSelectedItem(); //Make sure that the value actually changed if(!currentSelection.equals(selected[i]) { //If the previous value of the combobox was "-Select-" don't add it to all the other comboboxes if(!selected[i].equals(options[0])) { //Add back the previous value to all comboboxes other than the one that fired the event for(int j = 0; j < comboBoxes.length; j++) { if(j != i) { comboBoxes[j].addItem(selected[i]); } } } //If current value of the combobox is "-Select-" don't remove it from all other comboboxes if(!currentSelection.equals(options[0]) { //Remove the current value from all comboboxes other than the one that fired the event for(int j = 0; j < comboBoxes.length; j++) { if(j != i) { comboBoxes[j].removeItem(comboBoxes[i].getSelectedItem()); } } } } //Set the selected item for the combobox that fired the event to the current value selected[i] = currentSelection; } }}
