我不断收到在线程异常“主”:如何解决线程“main”,java.lang.ArithmeticException中的异常:/ by zero?
java.lang.ArithmeticException:/by zero
at PersonalityTest.percentage(PersonalityTest.java:85)
at PersonalityTest.main(PersonalityTest.java:19)
我想每次扫描器读取A或B的时间加计数,并得到B.
的百分比import java.io.*;
import java.util.*;
public class PersonalityTest {
public static final int dimen = 4;
public static void main(String [] args) throws FileNotFoundException {
Scanner input = new Scanner(new File("personality.txt"));
PrintStream out = new PrintStream(new File("output.txt"));
int[] a = new int[4];
int[] b = new int[4];
welcome();
while (input.hasNextLine()) {
String letter = letter(input, out);
countNum(a, b, out, letter);
int[] percentage = percentage(a, b, out);
type(out, percentage);
out.println("");
}
}
public static void welcome() {
System.out.println("The Keirsey Temperament Sorter is a test that measures four independent dimensions of your personality: ");
System.out.println("1. Extrovert versus Introvert (E vs. I): what energizes you");
System.out.println("2. Sensation versus iNtuition (S vs. N): what you focus on");
System.out.println("3. Thinking versus Feeling (T vs. F): how you interpret what you focus on");
System.out.println("4. Judging versus Perceiving (J vs. P): how you approach life");
System.out.println("");
}
public static String letter (Scanner input, PrintStream out) {
String name = input.nextLine();
out.println(name + ":");
String letter = input.nextLine();
return letter;
}
public static void countNum(int[] a, int[] b, PrintStream out, String letter) {
int[] countA = new int[7];
int[] countB = new int[7];
int n = 0;
out.print("answers: [");
for (int i = 0; i < letter.length(); i++) {
int type = i % 7;
if (letter.charAt(i) == 'A' || letter.charAt(i) == 'a') {
n = 1;
}
else if (letter.charAt(i) == 'B' || letter.charAt(i) == 'b') {
n = 1;
}
countA[type] += n;
countB[type] += n;
if (type == 2 || type == 4 || type == 6) {
a[type/2] = countA[type - 1]+ countA[type];
b[type/2] = countB[type - 1]+ countA[type];
} else if (type == 0) {
a[0] = countA[0];
b[0] = countB[0];
}
for (int j = 0; j < dimen; j++) {
out.print(a[j] + "A-" + b[j] + "B," + " ");
}
}
out.print("]");
}
public static int[] percentage (int[] a, int[] b, PrintStream out) {
int[] percentage = new int [4];
out.print("percent B: [");
double n = 0.0;
for (int i = 0; i < dimen; i++) {
n = b[i] * 100/(a[i] + b[i]); // <--- This is where I get error
percentage [i] = (int) Math.round(n);
out.print(percentage[i]);
}
out.print("]");
return percentage;
}
public static void type (PrintStream out, int[] percentage) {
String[] type = new String [4];
out.print("type: ");
for (int i = 0; i <= dimen; i++) {
while (percentage[i] > 50) {
if (i == 0) {
type[1] = "I";
}
else if (i == 1) {
type[2] = "N";
}
else if (i == 2) {
type[3] = "F";
}
else {
type[4] = "P";
}
}
while (percentage[i] < 50) {
if (i == 0) {
type[1] = "E";
}
else if (i == 1) {
type[2] = "S";
}
else if (i == 2) {
type[3] = "T";
}
else {
type[4] = "J";
}
}
out.print(Arrays.toString(type));
}
}
}
不要在PersonalityTest.java的第85行除以零。精明? –