java 警告：资源泄漏：“键盘”永远不会关闭
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Warning: Resource leak: 'keyboard' is never closed
提问by Ajay P
import java.util.Scanner;
public class LetterGrade {
public static void main(String[] args) {
char grade;
String input;
Scanner keyboard = new Scanner(System.in);
System.out.println("Enter grade awarded");
input = keyboard.nextLine();
grade = input.charAt(0);
switch (grade) {
case 'A':
System.out.println("Grade was between 89.5 and 100");
break;
case 'B':
System.out.println("Grade was between 79.5 and 89.49");
break;
case 'C':
System.out.println("Grade was between 69.5 and 79.49");
break;
case 'D':
System.out.println("Grade was between 59.5 and 69.49");
break;
case 'F':
System.out.println("Grade was below 59.5");
break;
default:
System.out.println("Invalid grade inputted");
break;
}
}
}
[line: 9] Warning: Resource leak: 'keyboard' is never closed
[line: 9] 警告：资源泄漏：“键盘”永远不会关闭
That's the warning that I'm receiving. I don't think the source is actually being leaked. But i don't know how to get it off so i can compile the code
这就是我收到的警告。我不认为源实际上被泄露了。但我不知道如何将其关闭以便我可以编译代码
回答by Elliott Frisch
It is safe to ignore that warning, and I would never close()a scanner that is wrapping the global System.in
忽略该警告是安全的，我永远不会close()使用包装全局的扫描仪System.in
回答by Abbath
You need to close the keyboard Scanner.
keyboard.close().
您需要关闭键盘扫描仪。
keyboard.close().
回答by Kieran M
You opened the keyboard with:
你打开了键盘：
Scanner keyboard = new Scanner(System.in);
This needs to be closed with the keyboard.close()method when the keyboard input is no longer needed.
keyboard.close()当不再需要键盘输入时，这需要使用方法关闭。
