java – 如何计算和排序字符串中的字母
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我想从用户输入中对字母进行排序,并打印出来自用户的字符串中每个字母的数量.这是我到目前为止,我想知道这是否是正确的方法.我对java比较新,所以请尽可能保持简单.根据我使用循环而不是大量if else结构的建议,我对我的代码做了一些调整.这就是我所拥有的:
public class Assignment9
{
public static void main( String [] args )
{
String user_string = Input.getString( "Please enter a string" );
int length = user_string.length();
int char_number = 1;
int alphabet[] = new int[26];
for( int repeats = 0 , repeats <= length , repeats++ )
{
char letter = user_string.charAt( char_number );
char to_be_tested = Character.toLowerCase( letter );
int subscript = 0;
for(int letter_number = 97 , letter_number <= 122 , letter_number++ )
{
char tester = (char) letter_number;
if( to_be_tested == tester )
{
alphabet[subscript]++;
subscript++;
}
}
char_number++;
}
display( alphabet );
}
public static void display( int alphabet[] )
{
int letter = 65;
for( int a = 0; a < alphabet.length; a++ )
{
char character = ( char )letter;
System.out.println ( "letter " + character + " count is " + alphabet[a] );
letter++;
}
}
}
我收到这些错误
test.java:9: error: ';' expected
for( int repeats = 0 , repeats <= length , repeats++ )
^
test.java:9: error: illegal start of expression
for( int repeats = 0 , repeats <= length , repeats++ )
^
test.java:9: error: ';' expected
for( int repeats = 0 , repeats <= length , repeats++ )
^
test.java:9: error: illegal start of expression
for( int repeats = 0 , repeats <= length , repeats++ )
^
test.java:9: error: ')' expected
for( int repeats = 0 , repeats <= length , repeats++ )
^
test.java:9: error: illegal start of expression
for( int repeats = 0 , repeats <= length , repeats++ )
^
test.java:14: error: ';' expected
for(int letter_number = 97 , letter_number <= 122 , letter_number++ )
^
test.java:14: error: illegal start of expression
for(int letter_number = 97 , letter_number <= 122 , letter_number++ )
^
test.java:14: error: ';' expected
for(int letter_number = 97 , letter_number <= 122 , letter_number++ )
^
test.java:14: error: illegal start of expression
for(int letter_number = 97 , letter_number <= 122 , letter_number++ )
^
test.java:14: error: ')' expected
for(int letter_number = 97 , letter_number <= 122 , letter_number++ )
^
test.java:14: error: illegal start of expression
for(int letter_number = 97 , letter_number <= 122 , letter_number++ )
^
12 errors
解决方法:
这是一种计算字母的简单方法,忽略大小写:
final int[] chars = new int[26];
for (char c : value.toLowerCase().toCharArray()) {
if ((c >= 'a') && (c<= 'z')) {
chars[c - 'a']++;
}
}
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