32_StringBuilder java.lang.StringBuilder.reverse();

StringBuilder java.lang.StringBuilder.reverse()

문자열 역순 (뒤집기)

Input   : I am a girl
Output : I ma a lrig

※ 아래 두 소스는 같은 결과를 출력합니다.

public String reverse() {
	String[] arr = str.split(" ");
	String blank = "";

	for (String str : arr) {
		if (blank.length() > 0) {
			blank += " ";
		}
		blank += new StringBuilder(str).reverse();
	}
	return blank;		
}

public String reverse() {
	String arr[] = str.split(" ");
	String blank = "";

	for (String st : arr) {
		blank += new StringBuilder(st).reverse().append(" ").toString();
	}
	return blank.trim();
}

 

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Input   : I am a girl
Output : lrig a ma I

public String reverse() {
        StringBuilder builder = new StringBuilder(str);

        return builder.reverse().toString();
        
//      return (new StringBuffer(str).reverse().toString()); 
}

 

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Input   : I am 24 years old
Output : I ma  sraey dlo

public String reverse() {
	String ignore = str.replaceAll("\\d+", "");
		
	String arr[] = ignore.split(" ");
	String blank = "";		
	
	for (String st : arr) {
		blank += new StringBuilder(st).reverse().append(" ").toString();
	}
	return blank.trim();
}