public class ChangeCases {

public static void main(String[] args) {
String input = "WelComE TO School ";
char[] cArray;
StringBuffer output = new StringBuffer("");
String[] sArray = input.split(" ");
/**
* Break the String into words using split() and check each character of
* the word. If the character is between the range 65 to 90 i.e., if its
* an upper case change to lower case and append to the string buffer.
* If the character is between the range 97 to 122 i.e., if its in lower
* case change it to upper case and append to the string buffer
* 'output'.
**/
for (int j = 0; j < sArray.length; j++) {
cArray = sArray[j].toCharArray();
for (int i = 0; i < cArray.length; i++) {
if (cArray[i] >= 65 && cArray[i] <= 90) {
output.append(Character.toLowerCase(cArray[i]));
} else if (cArray[i] >= 97 && cArray[i] <= 122) {
output.append(Character.toUpperCase(cArray[i]));
}
}
output.append(" ");
}
System.out.println(output.toString());
}

}

Regards,
javaquest2010.

Hi Friend,

Try the following code:

import java.util.*;

class CaseConverter{
public static void main(String[] args) {
Scanner input=new Scanner(System.in);
System.out.print("Enter string: ");
String str=input.nextLine();
StringBuffer sb=new StringBuffer();
char ch[]=str.toCharArray();
for(int i=0;i<ch.length;i++){
if(ch[i]==' '){
sb.append(" ");
}
if(Character.isLowerCase(ch[i])){
char cha=Character.toUpperCase(ch[i]);
sb.append(Character.toString(cha));
}
else if(Character.isUpperCase(ch[i])) {
char cha=Character.toLowerCase(ch[i]);
sb.append(Character.toString(cha));
}
}
System.out.println(sb.toString()+" ");
}
}

Thanks

import java.io.*;
public class ja
{
public static void main(String args[])throws IOException
{
InputStreamReader read=new InputStreamReader(System.in);
BufferedReader in=new BufferedReader(read);
String name,name1=" ";
int a,i;
char chr,chr1=0;
System.out.println("Enter your name");
name=in.readLine();
a=name.length();
for(i=0;i<a;i++)
{
chr=name.charAt();
if(chr>='A'&&chr<='Z')
{
chr1=Character.toLowerCase(chr);
name1=name1+chr1;
}
if(chr>='a'&&chr<='z')
{
chr1=Character.toUpperCase(chr);
name1=name1+chr1;
}
if(chr==' ')
name1=name1+" ";
}
System.out.println(name1);
}
}