Java 中的分隔符
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Delimiters in Java
提问by lqdc
I am trying to figure out how to use delimiters in Java. Basically, I am trying to parse input like this: "(x1, x2)" into double values. When I assign variables to the next double, the next integer gets counted as a double instead of the value between delimiters. How would I separate the values between delimiters and put them into variables?
我想弄清楚如何在 Java 中使用分隔符。基本上，我试图将这样的输入：“(x1, x2)”解析为双精度值。当我将变量分配给下一个双精度值时，下一个整数被计为双精度值，而不是分隔符之间的值。我如何将分隔符之间的值分开并将它们放入变量中？
System.out.print("Enter coordinates for two points as (x1, x2) (y1, y2): ");
Scanner input = new Scanner (System.in);
String wholeString = input.nextLine();
Scanner stringScanner = new Scanner (wholeString).useDelimiter("[,\s\(\)]*");
x1 = stringScanner.nextDouble();
x2 = stringScanner.nextDouble();
y1 = stringScanner.nextDouble();
y2 = stringScanner.nextDouble();
slope = (y2 - y1) / (x2 - x1);
回答by Sergey Vedernikov
try to use this delimiter: [,\\s\\(\\)]+
尝试使用此分隔符： [,\\s\\(\\)]+
*means 0or more
*意味着0或更多
