Write code to Converts a string that contains upper-case letter and underscores (e.g., constant names) to a camel-case string. - Java java.lang

Java examples for java.lang:String Camel Case

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Requirements

Write code to Converts a string that contains upper-case letter and underscores (e.g., constant names) to a camel-case string.

Hint

Demo Code

//package com.java2s;
    //from   w  ww .  j a  v a 2s  . c o  m
public class Main {
    public static void main(String[] argv) {
        String text = "ABC_DEF";
        System.out.println(convertAllCapsToLowerCamelCase(text));
    }
    
    /**
     * Converts a string that contains upper-case letter and underscores (e.g.,
     * constant names) to a camel-case string. For example, MY_CONSTANT is converted
     * to myConstant.
     * 
     * @param text the string to convert
     * 
     * @return a camel-case version of text
     */
    public static String convertAllCapsToLowerCamelCase(String text) {
        String lowerCase = text.toLowerCase();
        while (true) {
            int i = lowerCase.indexOf('_');
            if (i < 0) {
                break;
            }
            String head = lowerCase.substring(0, i);
            if (i + 1 == lowerCase.length()) {
                lowerCase = head;
                break;
            } else {
                char charAfterUnderscore = lowerCase.charAt(i + 1);
                char upperCase = Character.toUpperCase(charAfterUnderscore);
                if (i + 2 < lowerCase.length()) {
                    String tail = lowerCase.substring(i + 2,
                            lowerCase.length());
                    lowerCase = head + upperCase + tail;
                } else {
                    lowerCase = head + upperCase;
                    break;
                }
            }
        }
        return lowerCase;
    }
}

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