我得到 - java.io.IOException 通过导入 IO 无法解决错误
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I am getting - java.io.IOException cannot be resolved error though importing the IO
提问by user3743243
// Using a do-while to process a menu selection.
public class Menu {
public static void main(String args[]) throws java.io.IOException {
char choice;
do {
System.out.println("Help on: ");
System.out.println(" 1. if");
System.out.println(" 2. switch");
System.out.println(" 3. while");
System.out.println(" 4. do-while");
System.out.println(" 5. for\n");
System.out.println("Choose one: ");
choice = (char) System.in.read();
} while (choice < '1' || choice > '5');
System.out.println("\n");
switch (choice) {
case '1':
System.out.println("The if:\n");
System.out.println("if(condition) statement;");
System.out.println("else statement;");
case '2':
System.out.println("The switch:\n");
System.out.println("switch(expression) {");
System.out.println(" case constant:");
System.out.println(" statement sequence");
System.out.println(" break;");
System.out.println(" //...");
System.out.println("}");
break;
case '3':
System.out.println("The while:\n");
System.out.println("while(condition) statement;");
break;
case '4':
System.out.println("The do-while:\n");
System.out.println("do {");
System.out.println(" statement;");
System.out.println("} while (condition);");
break;
case '5':
System.out.println("The for:\n");
System.out.println("for(initialization; condition; iteration)");
System.out.println(" statement;");
break;
}
}
}
When I run this program in Eclipse IDE I get this error
当我在 Eclipse IDE 中运行此程序时，出现此错误
Exception in thread “main” java.lang.Error: Unresolved compilation problem:
java.io.IOException cannot be resolved to a type at Menu.main(Menu.java:3)
I have rebuilt the project, cleaned it several times, refreshed still no luck..... :-(
我重建了项目，清理了几次，刷新仍然没有运气...... :-(
回答by King Julian
The code you provided here works perfectly.
您在此处提供的代码运行良好。
This error happens when you use Eclipse as IDE and try to run code that doesn't even compile. Check your Problems view in Eclipse, and fix the compilation errors before executing the application.
当您将 Eclipse 用作 IDE 并尝试运行甚至无法编译的代码时，就会发生此错误。在 Eclipse 中检查您的问题视图，并在执行应用程序之前修复编译错误。
回答by Kuku
the ioexcpetion is in rt.jar which should already be included in your jdk lib. Just make sure your project build path include your jdk or you can just include rt.jar in your build path
ioexcpetion 在 rt.jar 中，它应该已经包含在您的 jdk 库中。只要确保你的项目构建路径包含你的 jdk 或者你可以在你的构建路径中包含 rt.jar
