抓住没有尝试错误

Question

我想从两个文本字段中得到总结.我想要一种在结果文本框中返回nill的方法.为什么以下代码抛出"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

你有一个开口支架太多:

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("");
   }       
}