[问题]java新手 java.io 无法执行？
楼主: ProGramE (SP_one) 2017-07-26 02:10:34
我是在 Eclipse 编辑 使用 java.io 却发生问题 直接复制网络上的教学也是无法执行？
以下是我所编译的
package pratice;
import java.io.*;
public class prac_ch03
{
public static void main(String args[])throws IOException
{
float height;
float weight;
System.out.println("Please input your height.");
height = keyin.readLine();
System.out.println("Please input your weight.");
weight = keyin.readLine();
System.out.println("Your BMI is :" + weight/(height*height));
}
}
执行出现：
Exception in thread "main" java.lang.Error: Unresolved compilation problems:
keyin cannot be resolved
keyin cannot be resolved
at pratice.prac_ch03.main(prac_ch03.java:13)
请问是我忽略什么步骤以至于如此吗？
在网络上寻找都找不到解答
麻烦各位！
以下是我所编译的
package pratice;
import java.io.*;
public class prac_ch03
{
public static void main(String args[])throws IOException
{
float height;
float weight;
System.out.println("Please input your height.");
height = keyin.readLine();
System.out.println("Please input your weight.");
weight = keyin.readLine();
System.out.println("Your BMI is :" + weight/(height*height));
}
}
执行出现：
Exception in thread "main" java.lang.Error: Unresolved compilation problems:
keyin cannot be resolved
keyin cannot be resolved
at pratice.prac_ch03.main(prac_ch03.java:13)
请问是我忽略什么步骤以至于如此吗？
在网络上寻找都找不到解答
麻烦各位！
作者: storypp (随风而逝的是一份真) 2017-07-26 02:26:00
没看到你宣告keyin呀....
作者: james732 (好人超) 2017-07-26 09:13:00
你在哪里看到keyin的用法的？
作者: gmoz ( This can't do that. ) 2017-07-26 10:15:00
复制贴上前也先该稍微看懂一下再贴吧你这个是连基本JAVA观念都没有，先补足基础再开始吧
作者: jinn (阿昌) 2017-07-27 01:42:00
缺的keyin可能长这样 ![]()
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" target="_blank" rel="nofollow">作者: hpbl (顶) 2017-08-23 13:50:00
Compiler给的错误讯息要会看啊...