小编use*_*330的帖子

可能重复:
如何比较Java中的字符串？

我是以错误的方式比较字符串吗？请告诉我如何正确比较？谢谢.

private void deleteButtonActionPerformed(java.awt.event.ActionEvent evt) {                                             
        String selectedVal = (String) jList1.getSelectedValue();
        AbstractListModel model = (AbstractListModel) jList1.getModel();
        int numberElements = model.getSize();
        final String[] allElements = new String[numberElements + 1];
        for (int i = 0; i < numberElements - 1; i++) {
            String val = (String) model.getElementAt(i);
            ***if (selectedVal != val)*** {
                allElements[i] = (String) model.getElementAt(i);
            }
        }
            controller.deleteButtonClicked(selectedVal);

            jList1.setModel(new javax.swing.AbstractListModel() {

            String[] strings = allElements;

            public int getSize() {
                return strings.length;
            }

            public Object getElementAt(int i) {
                return strings[i]; …

在此代码中,当我从列表中间选择一个元素并删除时,所选元素下面的元素也会从"视图"中删除.但它们存在于数据库中,并在应用程序运行时再次出现.请帮我解决这个错误.谢谢.

DeleteController delController = new DeleteController();
delController.deleteInfo(dbId);
this.jList1 = list;
AbstractListModel model = (AbstractListModel) jList1.getModel();
int numberElements = model.getSize();
final String[] allElements = new String[numberElements + 1];
for (int i = 0; i < numberElements - 1; i++) {
    String val = (String) model.getElementAt(i);
    if (!dbId.equals(val)) {
        allElements[i] = (String) model.getElementAt(i);
    }
}
jList1.setModel(new javax.swing.AbstractListModel() {

    String[] strings = allElements;

    public int getSize() {
        return strings.length;
    }

    public Object getElementAt(int i) {
        return strings[i];
    }
});