program to calculate product of each column in matrix

Write a java program to change First char in small and other in capital : 

import java.util.Scanner;

public class FirstCharIntoSmall {

public static void main(String[] args) {

Scanner sc = new Scanner(System.in);

System.out.println("Enter Sentence ");

String str = sc.nextLine();

System.out.println("Before small caps \n"+str);

System.out.println("After changing String ");

str=initSmall(str);

System.out.println(str);

}

private static String initSmall(String str) {

char ch[] = str.toCharArray();

for (int i = 0; i < ch.length; i++) {

if (i == 0 && ch[i] != ' ' || (ch[i] != ' ' && ch[i - 1] == ' ')) {

if (ch[i] >= 'A' && ch[i] <= 'Z') {

ch[i] = (char) (ch[i] + 32);

}

} else {

if (ch[i] >= 'a' && ch[i] <= 'z') {

ch[i] = (char) (ch[i] - 32);

}

}

}

return new String(ch);

}

}