Java JOptionPane的输入验证。如何确保输入是双精度的？

你怎么能检查输入是双精度的

---

Double.parseDouble

如果输入不是

Double

，将抛出

NumberFormatException

。如果要对异常进行处理，请捕获该异常

可以这样做：

public void parse() {
    try {
        double d = Double.parseDouble(JOptionPane.showInputDialog("What is the radius of the circle?"));
    } catch (NumberFormatException nfe) {
        //do something with the input here
        nfe.printStacktrace();
    }
}

public void parse() {
    try {
        double d = Double.parseDouble(JOptionPane.showInputDialog("What is the radius of the circle?"));
    } catch (NumberFormatException nfe) {
        //do something with the input here
        nfe.printStacktrace();
    }
}