java - 捕获而不尝试错误

Question

我想从两个文本字段获得总和结果。我想要一种在结果文本框中返回 null 的方法。为什么以下代码会抛出“cath without try”错误。我哪里错了，请帮忙。

private void AddButton4ActionPerformed(java.awt.event.ActionEvent evt) {
  try
   {
    int x = Integer.parseInt(FirstNumberTextField.getText());
    int y = Integer.parseInt(SecondNumberTextField.getText());
    ResultTextField1.setText((x + y)+"");
   {
   catch(Exception e)
   {
       ResultTextField1.setText("");
   }       
}

Answer 1

您的左大括号过多:

private void AddButton4ActionPerformed(java.awt.event.ActionEvent evt) {
  try
   {
    int x = Integer.parseInt(FirstNumberTextField.getText());
    int y = Integer.parseInt(SecondNumberTextField.getText());
    ResultTextField1.setText((x + y)+"");
   } // <-- This one was wrong.
   catch(Exception e)
   {
       ResultTextField1.setText("");
   }       
}