CodePudding user response:

 
import java.util.Scanner; 
Public class CaseReverse {
Public String reverse (String s) {
The StringBuilder buf=new StringBuilder (); 
Char [] ch=s.t oCharArray (); 
For (int I=ch. Length - 1; I>=0; I -) {
If (Character. IsLowerCase (ch) [I]) {
Buf. Append (Character. ToUpperCase (ch [I])); 
} else if (Character. IsUpperCase (ch) [I]) {
Buf. Append (Character. ToLowerCase (ch [I])); 
} else {
Buf. Append (ch [I]); 
} 
} 
return buf.toString(); 
} 
Public static void main (String [] args) {
Scanner sc=new Scanner(System.in); 
System. The out. Printf (" both Please input a string: "); 
String s=sc. NextLine (); 
CaseReverse cr=new CaseReverse (); 
System. The out. Println (cr. Reverse (s)); 
} 
} 

CodePudding user response:

reference 1st floor qybao response:

is a minute or two things

 
import java.util.Scanner; 
Public class CaseReverse {
Public String reverse (String s) {
The StringBuilder buf=new StringBuilder (); 
Char [] ch=s.t oCharArray (); 
For (int I=ch. Length - 1; I>=0; I -) {
If (Character. IsLowerCase (ch) [I]) {
Buf. Append (Character. ToUpperCase (ch [I])); 
} else if (Character. IsUpperCase (ch) [I]) {
Buf. Append (Character. ToLowerCase (ch [I])); 
} else {
Buf. Append (ch [I]); 
} 
} 
return buf.toString(); 
} 
Public static void main (String [] args) {
Scanner sc=new Scanner(System.in); 
System. The out. Printf (" both Please input a string: "); 
String s=sc. NextLine (); 
CaseReverse cr=new CaseReverse (); 
System. The out. Println (cr. Reverse (s)); 
} 
} 

Thank you, but it's too difficult for me