如何使我的验证方法替换初始无效输入
一个方法。比如从变量中更改无效的负数
'r' "verify"的新输入import javax.swing.JOptionPane;
public class Cylinder {
private static final double PI = 3.1416;
private double radius;
private double height;
public Cylinder()
{
radius = 1.0;
height = 1.0;
}
public Cylinder(double r, double h) {
radius = h;
height = r;
}
private double verifyData(double verify, String confirm)
{
verify = radius;
verify = height;
while(verify <= 0)
{
JOptionPane.showMessageDialog(null, "Invalid input");
confirm = JOptionPane.showInputDialog("Enter new value");
verify = Double.parseDouble(confirm);
}
return verify;
}
public void setRadius(double r) {
radius = r;
verifyData(r, null);
}
public void setHeight(double h) {
height = h;
}
public double getRadius() {
return radius;
}
public double getHeight() {
return height;
}
public double getVolume() {
return (PI * Math.pow(radius, 2) * height);
}
public double getSurfaceArea() {
return ((2 * PI * radius * height) + (2 * PI * Math.pow(radius, 2)));
}
public static double convertInchesToFeet(double r) {
return r / 12.0;
}
}
。感谢。
D = malloc(sizeof(data*)); // allocate memory for a single pointer