to Capitalize Camel Case - Java java.lang

Java examples for java.lang:String Camel Case

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Description

to Capitalize Camel Case

Demo Code


//package com.java2s;

public class Main {
    public static void main(String[] argv) throws Exception {
        String s = "java2s.com";
        System.out.println(toCapitalizeCamelCase(s));
    }//w  ww.  j ava 2s  .c  o m

    private static final char SEPARATOR = '_';

    public static String toCapitalizeCamelCase(String s) {
        if (s == null) {
            return null;
        }
        s = toCamelCase(s);
        return s.substring(0, 1).toUpperCase() + s.substring(1);
    }

    public static String toCamelCase(String s) {
        if (s == null) {
            return null;
        }

        s = s.toLowerCase();

        StringBuilder sb = new StringBuilder(s.length());
        boolean upperCase = false;
        for (int i = 0; i < s.length(); i++) {
            char c = s.charAt(i);

            if (c == SEPARATOR) {
                upperCase = true;
            } else if (upperCase) {
                sb.append(Character.toUpperCase(c));
                upperCase = false;
            } else {
                sb.append(c);
            }
        }

        return sb.toString();
    }
}

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