Question
In: Computer Science
Why am I getting this error: Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: Index 0 out of bounds...
Why am I getting this error:
Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: Index 0 out of bounds for length 0
at HW3.main(HW3.java:6)
The code:
import java.io.FileWriter;
import java.io.IOException;
public class HW3 {
public static void main(String[] args) throws IOException {
// 0th argument contains the name of algorithm
String algo = args[0];
// 1st argument contains the name of file
// Make a new file
FileWriter fw = new FileWriter(args[1]);
if (algo.equals("p1")) {
// 2nd argument comes in the form of string.
// convert it to intger and run a loop
for (int i = 1; i <= Integer.parseInt(args[2]); i++) {
double[] x = new double[(int) Math.pow(10, i)];
// use start and end for recording time
long start = System.currentTimeMillis();
prefixAverage1(x);
long end = System.currentTimeMillis();
double totalTime = Math.log10(end - start);
fw.write(String.valueOf(totalTime));
String newLine = System.getProperty("line.separator");
fw.write(newLine);
}
} else if (algo.equals("p2")) {
for (int i = 1; i <= Integer.parseInt(args[2]); i++) {
double[] x = new double[(int) Math.pow(10, i)];
long start = System.currentTimeMillis();
prefixAverage2(x);
long end = System.currentTimeMillis();
double totalTime = Math.log10(end - start);
fw.write(String.valueOf(totalTime));
String newLine = System.getProperty("line.separator");
fw.write(newLine);
}
} else if (algo.equals("e1")) {
for (int i = 1; i <= Integer.parseInt(args[2]); i++) {
int[] x = new int[(int) Math.pow(10, i)];
long start = System.currentTimeMillis();
example1(x);
long end = System.currentTimeMillis();
double totalTime = Math.log10(end - start);
fw.write(String.valueOf(totalTime));
String newLine = System.getProperty("line.separator");
fw.write(newLine);
}
} else if (algo.equals("e2")) {
for (int i = 1; i <= Integer.parseInt(args[2]); i++) {
int[] x = new int[(int) Math.pow(10, i)];
long start = System.currentTimeMillis();
example2(x);
long end = System.currentTimeMillis();
double totalTime = Math.log10(end - start);
fw.write(String.valueOf(totalTime));
String newLine = System.getProperty("line.separator");
fw.write(newLine);
}
} else if (algo.equals("e3")) {
for (int i = 1; i <= Integer.parseInt(args[2]); i++) {
int[] x = new int[(int) Math.pow(10, i)];
long start = System.currentTimeMillis();
example3(x);
long end = System.currentTimeMillis();
double totalTime = Math.log10(end - start);
fw.write(String.valueOf(totalTime));
String newLine = System.getProperty("line.separator");
fw.write(newLine);
}
} else if (algo.equals("e4")) {
for (int i = 1; i <= Integer.parseInt(args[2]); i++) {
int[] x = new int[(int) Math.pow(10, i)];
long start = System.currentTimeMillis();
example4(x);
long end = System.currentTimeMillis();
double totalTime = Math.log10(end - start);
fw.write(String.valueOf(totalTime));
String newLine = System.getProperty("line.separator");
fw.write(newLine);
}
} else if (algo.equals("e5")) {
for (int i = 1; i <= Integer.parseInt(args[2]); i++) {
int[] x = new int[(int) Math.pow(10, i)];
long start = System.currentTimeMillis();
// You can take a new array here, I am just running it for x here
example5(x, x);
long end = System.currentTimeMillis();
double totalTime = Math.log10(end - start);
fw.write(String.valueOf(totalTime));
String newLine = System.getProperty("line.separator");
fw.write(newLine);
}
}
fw.close();
}
public static double[] prefixAverage1(double[] x) {
int n = x.length;
double[] a = new double[n];
for (int j = 0; j < n; j++) {
double total = 0;
for (int i = 0; i <= j; i++) {
total += x[i];
a[j] = total / (j + 1);
}
}
return a;
}
public static double[] prefixAverage2(double[] x) {
int n = x.length;
double[] a = new double[n];
double total = 0;
for (int j = 0; j < n; j++) {
total += x[j];
a[j] = total / (j + 1);
}
return a;
}
public static int example1(int[] arr) {
int n = arr.length, total = 0;
for (int j = 0; j < n; j++)
total += arr[j];
return total;
}
public static int example2(int[] arr) {
int n = arr.length, total = 0;
for (int j = 0; j < n; j += 2)
total += arr[j];
return total;
}
public static int example3(int[] arr) {
int n = arr.length, total = 0;
for (int j = 0; j < n; j++)
for (int k = 0; k <= j; k++)
total += arr[j];
return total;
}
public static int example4(int[] arr) {
int n = arr.length, prefix = 0, total = 0;
for (int j = 0; j < n; j++) {
prefix += arr[j];
total += prefix;
}
return total;
}
public static int example5(int[] first, int[] second) {
int n = first.length, count = 0;
for (int i = 0; i < n; i++) {
int total = 0;
for (int j = 0; j < n; j++)
for (int k = 0; k <= j; k++)
total += first[k];
if (second[i] == total) count++;
}
return count;
}
}
Solutions
Expert Solution
import java.io.FileWriter;
import java.io.IOException;
public class HW3 {
public static void main(String[] args) throws IOException {
// here you need to pass the 3 command line arguments to run this program
// if you dont pass you will get this exception only
if(args==null || args.length<3) {
System.out.println("ERROR!: Please pass the required arguments from command line");
return;
}
// 0th argument contains the name of algorithm
String algo = args[0];
// 1st argument contains the name of file
// Make a new file
FileWriter fw = new FileWriter(args[1]);
if (algo.equals("p1")) {
// 2nd argument comes in the form of string.
// convert it to intger and run a loop
for (int i = 1; i <= Integer.parseInt(args[2]); i++) {
double[] x = new double[(int) Math.pow(10, i)];
// use start and end for recording time
long start = System.currentTimeMillis();
prefixAverage1(x);
long end = System.currentTimeMillis();
double totalTime = Math.log10(end - start);
fw.write(String.valueOf(totalTime));
String newLine = System.getProperty("line.separator");
fw.write(newLine);
}
} else if (algo.equals("p2")) {
for (int i = 1; i <= Integer.parseInt(args[2]); i++) {
double[] x = new double[(int) Math.pow(10, i)];
long start = System.currentTimeMillis();
prefixAverage2(x);
long end = System.currentTimeMillis();
double totalTime = Math.log10(end - start);
fw.write(String.valueOf(totalTime));
String newLine = System.getProperty("line.separator");
fw.write(newLine);
}
} else if (algo.equals("e1")) {
for (int i = 1; i <= Integer.parseInt(args[2]); i++) {
int[] x = new int[(int) Math.pow(10, i)];
long start = System.currentTimeMillis();
example1(x);
long end = System.currentTimeMillis();
double totalTime = Math.log10(end - start);
fw.write(String.valueOf(totalTime));
String newLine = System.getProperty("line.separator");
fw.write(newLine);
}
} else if (algo.equals("e2")) {
for (int i = 1; i <= Integer.parseInt(args[2]); i++) {
int[] x = new int[(int) Math.pow(10, i)];
long start = System.currentTimeMillis();
example2(x);
long end = System.currentTimeMillis();
double totalTime = Math.log10(end - start);
fw.write(String.valueOf(totalTime));
String newLine = System.getProperty("line.separator");
fw.write(newLine);
}
} else if (algo.equals("e3")) {
for (int i = 1; i <= Integer.parseInt(args[2]); i++) {
int[] x = new int[(int) Math.pow(10, i)];
long start = System.currentTimeMillis();
example3(x);
long end = System.currentTimeMillis();
double totalTime = Math.log10(end - start);
fw.write(String.valueOf(totalTime));
String newLine = System.getProperty("line.separator");
fw.write(newLine);
}
} else if (algo.equals("e4")) {
for (int i = 1; i <= Integer.parseInt(args[2]); i++) {
int[] x = new int[(int) Math.pow(10, i)];
long start = System.currentTimeMillis();
example4(x);
long end = System.currentTimeMillis();
double totalTime = Math.log10(end - start);
fw.write(String.valueOf(totalTime));
String newLine = System.getProperty("line.separator");
fw.write(newLine);
}
} else if (algo.equals("e5")) {
for (int i = 1; i <= Integer.parseInt(args[2]); i++) {
int[] x = new int[(int) Math.pow(10, i)];
long start = System.currentTimeMillis();
// You can take a new array here, I am just running it for x here
example5(x, x);
long end = System.currentTimeMillis();
double totalTime = Math.log10(end - start);
fw.write(String.valueOf(totalTime));
String newLine = System.getProperty("line.separator");
fw.write(newLine);
}
}
fw.close();
}
public static double[] prefixAverage1(double[] x) {
int n = x.length;
double[] a = new double[n];
for (int j = 0; j < n; j++) {
double total = 0;
for (int i = 0; i <= j; i++) {
total += x[i];
a[j] = total / (j + 1);
}
}
return a;
}
public static double[] prefixAverage2(double[] x) {
int n = x.length;
double[] a = new double[n];
double total = 0;
for (int j = 0; j < n; j++) {
total += x[j];
a[j] = total / (j + 1);
}
return a;
}
public static int example1(int[] arr) {
int n = arr.length, total = 0;
for (int j = 0; j < n; j++)
total += arr[j];
return total;
}
public static int example2(int[] arr) {
int n = arr.length, total = 0;
for (int j = 0; j < n; j += 2)
total += arr[j];
return total;
}
public static int example3(int[] arr) {
int n = arr.length, total = 0;
for (int j = 0; j < n; j++)
for (int k = 0; k <= j; k++)
total += arr[j];
return total;
}
public static int example4(int[] arr) {
int n = arr.length, prefix = 0, total = 0;
for (int j = 0; j < n; j++) {
prefix += arr[j];
total += prefix;
}
return total;
}
public static int example5(int[] first, int[] second) {
int n = first.length, count = 0;
for (int i = 0; i < n; i++) {
int total = 0;
for (int j = 0; j < n; j++)
for (int k = 0; k <= j; k++)
total += first[k];
if (second[i] == total)
count++;
}
return count;
}
}Issue:
// here you need to pass
the 3 command line arguments to run this program
// if you dont pass you will get
this exception only
if(args==null || args.length<3)
{
System.out.println("ERROR!: Please pass the required arguments from
command line");
return;
}
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venereology answered 2 years agoRelated Solutions
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