String buffer 효율성

Question

String buffer 사용법Stringbuffer buf &#61; new stringbuffer()buf.append(“a”);buf.append(“b”);buf.append(“a”).append(“b”);append가 많다는 과정하게 차이가 큰가여?

yamanin · Answer

없습니다.

kenu,전독시 · Answer

그냥 돌려봤습니다. public class StringTest { public static void main(String[] args) { long start &#61; System.nanoTime(); useString(); long lap1 &#61; System.nanoTime(); useStringBuffer(); long lap2 &#61; System.nanoTime(); useStringBuilder(); long lap3 &#61; System.nanoTime(); String result &#61; &#34;String: %d
StringBuffer: %d
StringBuilder: %d&#34;; System.out.printf(result, lap1 - start, lap2 - lap1, lap3 - lap2); } private static void useString() { String str &#61; &#34;&#34;; for (int i &#61; 0; i < 100000; i&#43;&#43;) { str &#43;&#61; &#34;a&#34;; } System.out.println(str.length()); } private static void useStringBuffer() { StringBuffer sb &#61; new StringBuffer(); for (int i &#61; 0; i < 100000; i&#43;&#43;) { sb.append(&#34;a&#34;); } System.out.println(sb.length()); } private static void useStringBuilder() { StringBuilder sb &#61; new StringBuilder(); for (int i &#61; 0; i < 100000; i&#43;&#43;) { sb.append(&#34;a&#34;); } System.out.println(sb.length()); } } 100000100000100000String: 387_380_542StringBuffer: 4_561_167StringBuilder: 2_284_666

String buffer 효율성

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