데블스캠프2011/셋째날/String만들기/송지원

String str("abcdef"); - 완료
String str4(str); - 완료

함수	예
charAt	str.charAt(3) == 'd'
compareTo	str2.compareTo("abcb") == 0
compareToIgnoreCase	str2.compareTo("AbCb") == 0
concat	str.concat(str) == "abcdefabcdef"
contains	str.contains("bcd") == TRUE
endsWith	str.endsWith("ef") == TRUE
startsWith	str.startsWith("abc") == TRUE
equals	str.equals(new String("abcdef")) == TRUE
equalsIgnoreCase	str.equalsIgnoreCase(new String("ABcdEf")) == TRUE
indexOf	str2.indexOf("b") == 1
isEmpty	str.isEmpty == FALSE
lastIndexOf	str2.lastIndexOf("b") == 3
length	str.length() == 6	- 완료	replace	str.replace("bc", "ad") == "aaddef"
split	str.split("c") == {"ab", "def"}
subString	str.subString(2, 4) == "cd"	- 완료	format	String::format("참석자 : %d명", 8) == "참석자 : 8명"
trim	str3.trim() == "aB c"
toLower	str3.toLower() == " ab c "
toUpper	str.toUpper() == "ABCDEF"
valueOf	String::valueOf(3) == "3"