Java编译错误：找不到符号

Java compile error: cannot find symbol

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嘿，我刚刚开始我的第一个Java编程书籍，所以这应该是一个简单的解决方案。我对条件句的新知识搞得一团糟，标题有误。

代码如下：

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import java.util.Scanner;

public class Music
{
public static void main( String[] args )
{

Scanner x = new Scanner( System.in );

int y;

System.out.print("Which is better, rap or metal? 1 for rap, 2 for metal, 3 for neither" );
y = input.nextInt();

if ( y == 1 )
System.out.print("Someone hasn't heard
http://www.youtube.com/watch?v=Vzbc4mxm430
yet" );

if ( y == 2 )
System.out.print("Someone hasn't heard
http://www.youtube.com/watch?v=s4l7bmTJ7j8
yet" );

if ( y == 3 )
System.out.print("=/
Music sucks anyway." );
}
}

当我试图编译时：

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Music.java:13: error: cannot find symbol
y = input.nextInt();

symbol: variable input
location: class Music
1 error

相关讨论

that is the error message telling你输入你的变量不存在在你的扫帚。你可能想使用你的扫描仪的对象，但它是你的一个叫X，不输入。P＞＜／

1	Scanner input = new Scanner( System.in );

应该修复它。P＞＜／

You have not the input这里定义的变量。You should have：P＞＜／

1	Scanner input = new Scanner( System.in );

相关讨论

你可以alternatively，只是变化：P＞＜／

1	y = input.nextInt();

to：P＞＜／

1	y = x.nextInt();

然后它会的工作。P＞＜／

inputis not because this is the *定义的队列中。提供你期望队列suggests the en to be an instance of the Scanner舱。but the instance of class is as Scannerx& not input真的定义。P＞＜／

你在AS used the variable输入P＞＜／

1	y=input.nextInt();

你不能做这个，因为这是不可变的。我*你的意思是，你可以"X"or replaceP＞＜／

1	Scanner x = new Scanner( System.in );

withP＞＜／

1	Scanner input = new Scanner( System.in );

1 2	Scanner input = new Scanner( System.in ); int y = input.nextInt();

(前)P＞＜／

1 2	Scanner x = new Scanner( System.in ); int y = x.nextInt();

相关讨论

1 2	Scanner x = new Scanner( System.in ); int y = x.nextInt();

This is the simple fix y＝x.nextint(instead of)；y＝()；input.nextintP＞＜／

相关讨论