Java String Upper Case toUpperCase(String s)

Description

Do an ASCII only upper case conversion.

License

Academic Free License

Declaration

public static String toUpperCase(String s) 

Method Source Code

//package com.java2s;
// Licensed under the Academic Free License version 3.0

public class Main {
    /**// w  w  w. jav a2s .  co m
     * Do an ASCII only upper case conversion.  Case conversion
     * with Locale can result in unexpected side effects.
     */
    public static char toUpperCase(char c) {
        if ('a' <= c && c <= 'z')
            return (char) (c & ~0x20);
        else
            return c;
    }

    /**
     * Do an ASCII only upper case conversion.  Case conversion
     * with Locale can result in unexpected side effects.
     */
    public static String toUpperCase(String s) {
        // first scan to see if string isn't already ok
        int len = s.length();
        int first = -1;
        for (int i = 0; i < len; ++i) {
            char a = s.charAt(i);
            char b = toUpperCase(a);
            if (a != b) {
                first = i;
                break;
            }
        }
        if (first == -1)
            return s;

        // allocate new char buf and copy up to first change
        char[] buf = new char[len];
        s.getChars(0, first, buf, 0);

        // change remainder of string
        for (int i = first; i < len; ++i)
            buf[i] = toUpperCase(s.charAt(i));

        return new String(buf);
    }
}

Related

1. toUpperCase(String from)
2. toUpperCase(String in)
3. toUpperCase(String input)
4. toUpperCase(String pString)
5. toUpperCase(String s)
6. toUpperCase(String s)
7. toUpperCase(String s)
8. toUpperCase(String s)
9. toUpperCase(String s)