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如题，做了如下测试，请过目。
import java.util.*;
public class Test {
public static void main(String[] args) {
Scanner input = new Scanner (System.in);
System.out.print("请输入： ");
String a = input.next();
System.out.print(a);
}
}

就是这几行代码，无法通过编译，提示如下：
Exception in thread "main" java.lang.Error: Unresolved compilation problems:
Scanner cannot be resolved to a type
Scanner cannot be resolved to a type

开始以为是少了jdk，在新立德里找到了jdk6，安装后，结果还是一样，实在是没有办法了，到社区求助，麻烦各位帮忙分析一下吧。。。

自己顶阿。。

救命阿。。

jdk 有问题吧

同问，如果不能解决的话，用bufferedreader太麻烦了。

我也是这样的问题阿 要怎么解决阿

是啊～我也这样 咋解决 没人说么

就是呀，有没有解决方法呀？

ok ,now i have find the solution to solve this problem.
At first ,you should adjust your system to use the higher version jdk,so you should enter these codes:

Codes:
sudo update-java-alternatives -s java-6-sun

Then you should go into eclipse
->window
->preferences
->java
->installed jres
now click add

select stanard vm if that pops up not sure if that will be in your version of eclipse

click browse
go to /usr/lib/jvm/The Appropriate One Probably java-6-sun-1.6.0.10 or similar/

Then just make sure you deselect the other JREs and only have this one selected

谢谢11楼的兄弟，我开始也猜测是jdk，jre版本不匹配，但不知怎么弄～

同样 问题，netbeans正常

我猜你是不是用了GIJ
试试sun-java-jre