JAVA的String类方法测试------JAVA

超、凢脫俗 2024-03-22 14:33 31阅读 0赞

>     public class StringChange
>     {
>         public static void main(String[] args)
>         {
>             StringChange sc = new StringChange();
>             String s = "abcdefg";
>             String s1 = sc.reverse(s,2,5);
>             System.out.println(s1);
>             String s2 = sc.reverse1(s,2,5);
>             System.out.println(s2);
>             String sub = "ab";
>             String str = "abkkcsdznabjcksablckkljklaab";
>             int count = sc.getSubCount(str,sub);
>             System.out.println(count);
>         }
>     
>         public String reverse(String str,int from,int to)
>         {
>             char[] c = str.toCharArray();
>             for (int i = from,j = to; i < j; i++,j--)
>             {
>                 char temp = c[i];
>                 c[i] = c[j];
>                 c[j] = temp;
>             }
>             String s = new String(c);
>             return s;
>         }
>     
>         public String reverse1(String str,int from,int to)
>         {
>             String fiStr = str.substring(0,from);
>             for (int i = to; i >= from; i--)
>             {
>                 fiStr += str.charAt(i);
>             }
>             fiStr += str.charAt(to+1);
>             return fiStr;
>         }
>     
>         public int getSubCount(String str,String sub)
>         {
>             int count = 0;
>             if(str.length() >= sub.length())
>             {
>                 int index = str.indexOf(sub);
>                 while (index >= 0) {
>                     count++;
>                     index = str.indexOf(sub, index + sub.length());
>                 }
>             }
>             return count;
>         }
>     }
> 
> public class StringChange  
> \{  
> public static void main(String\[\] args)  
> \{  
> StringChange sc = new StringChange();  
> String s = "abcdefg";  
> String s1 = sc.reverse(s,2,5);  
> System.out.println(s1);  
> String s2 = sc.reverse1(s,2,5);  
> System.out.println(s2);  
> String sub = "ab";  
> String str = "abkkcsdznabjcksablckkljklaab";  
> int count = sc.getSubCount(str,sub);  
> System.out.println(count);  
> \}
> 
> public String reverse(String str,int from,int to)  
> \{  
> char\[\] c = str.toCharArray();  
> for (int i = from,j = to; i < j; i++,j--)  
> \{  
> char temp = c\[i\];  
> c\[i\] = c\[j\];  
> c\[j\] = temp;  
> \}  
> String s = new String(c);  
> return s;  
> \}
> 
> public String reverse1(String str,int from,int to)  
> \{  
> String fiStr = str.substring(0,from);  
> for (int i = to; i >= from; i--)  
> \{  
> fiStr += str.charAt(i);  
> \}  
> fiStr += str.charAt(to+1);  
> return fiStr;  
> \}
> 
> public int getSubCount(String str,String sub)  
> \{  
> int count = 0;  
> if(str.length() >= sub.length())  
> \{  
> int index = str.indexOf(sub);  
> while (index >= 0) \{  
> count++;  
> index = str.indexOf(sub, index + sub.length());  
> \}  
> \}  
> return count;  
> \}  
> \}  
>