Question

好的，我试图从这个

创建的字符串中提取2个不同的双打

 line=JOptionPane.showInputDialog("Enter infos in this format name:hours@cashperhour");

名称是一个字符串，小时是双倍，而cashperhour是双倍

我通过这样做成功地提取了字符串

 name=line.substring(0,line.indexOf(":"));
 System.out.print(name);

但它失败了双

 hours=Double.parseDouble(line.substring(line.indexOf(":", line.indexOf("@"))));
  System.out.print(hours);

如果试试罗伯特詹姆斯：34 @ 45我得到

 Exception in thread "main" java.lang.StringIndexOutOfBoundsException: String index out of range: -1
at java.lang.String.substring(Unknown Source)

如果我尝试没有＆＃34; @＆＃34;罗伯特詹姆斯：34我得到了

 Exception in thread "main" java.lang.NumberFormatException: For input string: ":34"
at sun.misc.FloatingDecimal.readJavaFormatString(Unknown Source)
at sun.misc.FloatingDecimal.parseDouble(Unknown Source)
at java.lang.Double.parseDouble(Unknown Source)

有人能帮助我吗？对不起，如果没有正确写入，这是我在这里的第一篇文章

Answer 1

您可以使用split(...)，因为值由:

分隔

String[] data = line.split("\\:");
String name = data[0]; 
String[] numbers = data[1].split("@");
double hours = Double.parseDouble(numbers[0]);
double cashperhour = Double.parseDouble(numbers[1]);

Answer 2

经过测试和运作

试试这个：

    String data = "Enter infos in this format name:hours@cashperhour";
    String[] split_data = data.split(":",2);
    String[] between = split_data[1].split("@",2);

    //Your doubles:
    System.out.println(between[0]);
    System.out.println(between[1]);

另外，对于双重测试：

    String data = "Enter infos in this format name:1.2@5.4";
    String[] split_data = data.split(":",2);
    String[] between = split_data[1].split("@",2);

    //Your doubles:
    System.out.println(between[0]);
    System.out.println(between[1]);
    double hours = Double.parseDouble(between[0]);
    double cashperhour = Double.parseDouble(between[1]);

这为我编译：

public class Test {

/**
 * @param args
 */
public static void main(String[] args) {
    String data = "Enter infos in this format name:1.2@5.4";
    String[] split_data = data.split(":",2);
    String[] between = split_data[1].split("@",2);

    //Your doubles:
    System.out.println(between[0]);
    System.out.println(between[1]);
    double hours = Double.parseDouble(between[0]);
    double cashperhour = Double.parseDouble(between[1]);

}

}

从字符串中提取2个不同的double

2 个答案: