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LearnStringBuilder.java

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public class LearnStringBuilder {

// For a given String convert the first letter of each word to Uppercase.

public static String capitalise(String str) {

StringBuilder sb = new StringBuilder("");

// Does not cover all edge cases.

char ch = Character.toUpperCase(str.charAt(0));

sb.append(ch);

for (int i = 1; i < str.length(); i++) {

if (str.charAt(i) == ' ' && i < str.length() - 1) {

sb.append(str.charAt(i));

i++;

sb.append(Character.toUpperCase(str.charAt(i)));

} else {

sb.append(str.charAt(i));

}

}

return sb.toString();

}

public static String capitalise1(String str) {

StringBuilder sb = new StringBuilder();

boolean capitalizeNext = true;

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

char ch = str.charAt(i);

if (ch == ' ') {

sb.append(ch);

capitalizeNext = true;

} else {

if (capitalizeNext) {

sb.append(Character.toUpperCase(ch));

capitalizeNext = false;

} else {

sb.append(ch);

}

}

}

return sb.toString();

// Time complexity: O(n) where n is the length of the input string.

// Space complexity: O(n) for the StringBuilder.

}

public static void main(String[] args) {

StringBuilder sb = new StringBuilder("");

for (char ch = 'a'; ch <= 'z'; ch++) {

sb.append(ch);

}

System.out.println(sb);

String str = " hello there i am pratham chauhan a";

System.out.println(capitalise(str));

String str1 = " hello there i am pratham chauhan a";

System.out.println(capitalise1(str1));

String str2 = "hello there i am pratham chauhan a";

System.out.println(capitalise1(str2));

}

}