To change case of String

INPUT: JavA MaDe eASY

OUTPUT: jAVa mAdE Easy



class StringDemochangecase
{
static String changecase(String s)
{
String s1="";

for(int i=0;i {
char ch;
if(s.charAt(i)<91)
{
int c=s.charAt(i)+32;
ch=(char)c;
}
else
{
int c=s.charAt(i)-32;
ch=(char)c;
}
s1=s1+ch;
}
return s1;
}

public static void main(String args[])
{
String s="JavA MaDe eASY";
String s1=changecase(s);
System.out.println(s1);
}
}

To check whether String is Palindrome or Not

public class StringDemopalindrome
{
static boolean palindrome(String s)
{
String s1="";
int i, flag=0;

for(i=s.length()-1;i>=0;i--)
{
s1=s1+s.charAt(i);
}

for(i=0;i {
if (s.charAt(i)!=s1.charAt(i))
flag =1;
}

if(flag==1)
return false;
else
return true;
}

public static void main(String args[])
{
String s="madam";
boolean b=palindrome(s);
System.out.println(b);
}
}

Calculate Length of String

public class StringDemolength
{
static int length(String s)
{
int i,count=0;
for(i=0;i {
count++;
}
return count;
}

public static void main(String args[])
{
String s="India is a good country";
int count=length(s);
System.out.println(count);
}
}

Print String in Reverse Order

INPUT: INDIA

OUTPUT: AIDNI

public class StringDemoReverse
{
static String reverse(String s)
{
int i;
String s1="";
for(i=s.length()-1;i>=0;i--)
{
s1=s1+s.charAt(i);
}
return s1;
}

public static void main(String args[])
{
String s="India";
String s1=reverse(s);
System.out.println(s1);
}
}