To change all lower case later to upper case latter

-
import java.lang.Character;
class lowerupper
{
public static void main(String[] arg)
{
String str=new String("HeLLo tHis iS a JaVa prOgrAM");
char[] str1=str.toCharArray();
Character ch = str.charAt(0);
for(int i=0;i<str.length();i++)
{
ch=str.charAt(i);
if(ch.isUpperCase(ch))
{
str1[i]=ch.toLowerCase(ch);
}
else
{
str1[i]=ch.toUpperCase(ch);
}
}
String str2=new String(str1);
System.out.println(str2);
}
}


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