我正在使用 shellsort 从输入文件中查找人口。
这是我的代码:
package assignment.pkg3;
import java.io.*;
import java.util.*;
public class Sorting{
public static void main (String[] args) throws IOException
{
String[] countryArray = new String[238];
String [] newStringArray = new String [238];
Scanner stdIn = new Scanner(new File("C:\\Users\\talls_000\\Downloads\\CountryUnsortedFormat.txt"));
//reads the file into the array
while(stdIn.hasNext())
{
for (int i = 0; i < countryArray.length; i++)
{
countryArray[i] = stdIn.nextLine();
}//end for
}
int j;
int high = 65;
String temp;
//temp=countryArray[ i ].substring(50, 65);
for( int gap = countryArray.length / 2; gap > 0; gap /= 2 )
{
for( int i = gap; i < countryArray.length; i++ )
{
temp=countryArray[ i ].substring(50,high);
for( j = i; j >= gap && temp.compareTo( countryArray[ j - gap ] ) < 0; j -= gap )
{
countryArray[ j ] = countryArray[ j - gap ];
countryArray[ j ] = temp;
}
}
}
for (int i = 0; i < countryArray.length; i++)
{
System.out.println(countryArray[i]);
}//end for
}
}
我在第 33 行收到错误:temp=countryArray[ i ].substring(50,high);
Exception in thread "main" java.lang.StringIndexOutOfBoundsException: String index out of range: 65
at java.lang.String.substring(String.java:1950)
at assignment.pkg3.Sorting.main(Sorting.java:33)
如果我将 50 更改为 0,它可以工作,但我需要从点 50 开始。为什么会出现此错误?