Change last character of each latter in Upper Case

import java.lang.Character;
class lastuper
{
public static void main(String[] arg)
{
String str=new String("hello this is a java program");
char[] str1=str.toCharArray();
Character ch = str.charAt((str.length()-1));
str1[(str.length()-1)]=ch.toUpperCase(ch);
for(int i=0;i<str.length();i++)
{
if(str.charAt(i)==' '&&(i-1)!=0)
{
ch=str.charAt(i-1);
str1[i-1]=ch.toUpperCase(ch);
}
}
String str2=new String(str1);
System.out.println(str2);
}
}