Java - Try/Catch - 如果成功则访问 try block 中的变量

Question

假设我在某处有以下代码块:

while(condition){
    try {
        String twoStr= JOptionPane.showInputDialog("Enter two words sep by a space.");
        \\do stuff like splitting and taking an index which may cause out of bound exception
    catch (IOException e) {
        System.out.println("Sorry your words are terrible.");
     }

\\do stuff with twoStr

我无法访问 try/catch 语句之外的字符串，但我不想提示用户输入另外两个单词，以防他搞砸并输入一个单词。如何访问在 try block 中初始化的这个值？

Answer 1

字符串应该在 try/catch 语句之外定义:

while(condition){
    String twoStr = null;

    try {
        twoStr= JOptionPane.showInputDialog("Enter two words sep by a space.");
     } catch (IOException e) {
        System.out.println("Sorry your words are terrible.");
     }

     //do stuff with twoStr

这样，try/catch 语句以及其外部的代码都会看到该变量。您应该阅读scopes以便更好地理解这一点。