java - 为什么我收到错误 "must be caught or declared to be thrown"？

Question

这个问题已经有答案了:

What does "error: unreported exception <XXX>; must be caught or declared to be thrown" mean and how do I fix it? (1 个回答)

已关闭 10 个月前。

import java.io.*;

public class prelab7 {

   public static void readstring(String a){

    String s = "EECS 132";

    StringReader s1 = new StringReader(s);
    for (int n = 0; n < s.length(); n = n + 1){

        char c = (char)s1. read();
        System.out.print(" " + c);
    }
  }
}

发现 1 个错误:文件:/Users/clara/Desktop/EECS132/prelab7.java [行:8]错误:/Users/clara/Desktop/EECS132/prelab7.java:8:未报告的异常 java.io.IOException；必须被捕获或宣布被抛出

Answer 1

StringReader 是一个Reader。以及 Reader 的 .read() 方法 can throw an IOException .

您需要将方法声明更改为:

public static void readstring(String a)
    throws IOException
{
    // code here
}

(编辑:或使用 try/catch，如评论中所述；但是，如果您这样做，请避免使用经典的 .printStackTrace() )