reverse each word of the String

[moizpalitanawala]

Hello
I want to do reverse each word of the String
example if input String is "Hello World" then the output should be "olleH dlroW"

i Have tried this far

class g
{
static String s="Hello World Hello World";
static int last=s.lastIndexOf(' ');
static String tempS;
 
public static void start(int count)throws Exception
{
if(count!=last)
{
tempS+=reverse(s.substring(count,s.indexOf(count+1,' ')));
start(s.indexOf(count+1,' '));
}
 
if (count==last)
{
tempS+=reverse(s.substring(count));
System.out.println( tempS);
}
}
 
public static String reverse(String s1)
{
s1.trim();
int l=s1.length();
String temp=null;
for(int i=l;i>0;i++)
{
temp+=s1.charAt(i);
}
temp+=" ";
return temp;
}
 
public static void main()throws Exception
{
start(0);
}
}

[JosAH]

Have a look at the StringBuilder class; it can do the work for you.

kind regards,

Jos

[jkmyoung]

Line 26. String temp=null;
This should be String temp = new String(); //empty string

You can't add characters to a null, but you can add them to an empty string.

[JosAH]

@jkmyoung
This works for me:

public class AddToNull {
 
    public static void main (String[] args) {
 
        String s= null+"abc";
        System.out.println(s);
    }
}

kind regards,

Jos ;-)