首先,我非常非常新。任何幫助表示讚賞。所以,我可以在一切都是int時運行,但由於某種原因將其改爲double,我只能輸入第一個值和它的錯誤。我不明白爲什麼我不能這樣做:Java簡介 - 有什麼不對?
int datVal = Integer.parseInt(inNum);
double [] iOne;
iOne = new double[datVal];
直到我運行它或調試它沒有錯誤。下面是我得到了什麼:
import java.util.Arrays;
import javax.swing.JOptionPane;
public class arStats2 {
public static void main(String[] args) {
double med, men, min, max;
String inNum = JOptionPane.showInputDialog("Enter the number of data values:");
int datVal = Integer.parseInt(inNum);
double [] iOne;
iOne = new double[datVal];
double [] iTwo;
iTwo = new double[datVal];
int index=0;
for (index=0; index < iOne.length; index++) {
String value = JOptionPane.showInputDialog("Input a data value:");
int valIn = Integer.parseInt(value);
iOne[index] = valIn;
}
System.arraycopy(iOne, 0, iTwo, 0, iOne.length);
Arrays.sort(iOne);
String out1 = "Sorted data: ";
for (int i=0; i<iOne.length; i++) {
out1 = out1 +iOne[i]+"";
}
out1 = out1 +"\n";
String out2 = "Original data: ";
for (int i2=0; i2<iTwo.length; i2++) {
out2 = out2 +iTwo[i2] + "";
}
out2 = out2 +"\n";
med = median(iOne);
men = mean(iTwo);
max = computeMax(iOne);
min = computeMin(iOne);
JOptionPane.showMessageDialog(null, out2 +out1 +"Min Value: " +min +"\n"
+"Max value: " +max +"\n"
+"Median value: " +med +"\n"
+"Mean value: " +men +"\n");
}
public static double median(double[] iOne) {
double med;
int index, indexHi, indexLo;
if ((iOne.length %2) !=0) {
index = iOne.length/2;
med = iOne[index];
}
else {
indexHi = iOne.length/2;
indexLo = indexHi = 1;
med = (iOne[indexLo] + iOne[indexHi])/2;
}
return med;
}
public static double mean(double[] iOne) {
double sum = 0;
for (int i = 0; i < iOne.length; i++) {
sum += iOne[i];
}
return sum/iOne.length;
}
public static double computeMax(double[] iOne) {
double max = (iOne.length - 1);
return max;
}
public static double computeMin(double[] iOne) {
double min;
min = iOne[0];
return min;
}
}
對不起,不包括本。感謝您所有的快速回復!錯誤是:
Exception in thread "main" java.lang.NumberFormatException: For input string: "7.2"
at java.lang.NumberFormatException.forInputString(NumberFormatException.java:48)
at java.lang.Integer.parseInt(Integer.java:456)
at java.lang.Integer.parseInt(Integer.java:497)
at arStats2.main(arStats2.java:25)
**錯誤說**是什麼? – SLaks 2013-04-29 20:03:47
什麼是錯誤? – CodeChimp 2013-04-29 20:03:55
如果您研究運行時間與編譯時間,可以幫助您更好地理解錯誤。 http://stackoverflow.com/questions/846103/runtime-vs-compile-time – sircapsalot 2013-04-29 20:09:47