In this article we will discuss how to capitalize first letter of each word in a String.Suppose given string is,
this is the sample string
Now after converting first letter of each word, string will become,
This Is The Sample String
This type of StringĀ is also called Camel Case.
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Algorithm For Capitalizing First Letter of Each Word in String
- Iterate over the string from beginning to end
- For each character check its a white space or not.If its a white space then updateĀ a flag IS_SPACE true.
- If its a character between āaā to āzāĀ and flag IS_SPACE is trueĀ then just convert this character to upper case.
Complete code in Java is as follows,
package com.thispointer.java.string.examples; public class CaseConverter { /* * Convert Given String to Camel Case i.e. * Capitalize first letter of every word to upper case */ String camelCase(String str) { StringBuilder builder = new StringBuilder(str); // Flag to keep track if last visited character is a // white space or not boolean isLastSpace = true; // Iterate String from beginning to end. for(int i = 0; i < builder.length(); i++) { char ch = builder.charAt(i); if(isLastSpace && ch >= 'a' && ch <='z') { // Character need to be converted to uppercase builder.setCharAt(i, (char)(ch + ('A' - 'a') )); isLastSpace = false; } else if (ch != ' ') isLastSpace = false; else isLastSpace = true; } return builder.toString(); } public static void main(String[] args) { CaseConverter converter = new CaseConverter(); String str = converter.camelCase("This is the sample string"); System.out.println(str); } }
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