tempcru 삽질기록

[JAVA] String, StringBuilder, StringBuffer, BufferedWriter 차이 본문

Algorithm/자료구조

[JAVA] String, StringBuilder, StringBuffer, BufferedWriter 차이

dev-tempcru 2022. 7. 11. 19:10

String, StringBuilder, StringBuffer, BufferedWriter 차이


  String StringBuilder StringBuffer BufferedWriter
package java.lang java.lang java.lang java.io
Thread Safe O no guarantee O no guarantee
특징 - immutable
- 불변성 때문에 + 연산시 새로 Memory 할당하고 GC돌림
-변경없을 Data 에 사용해야함
- 대규모 입출력시 느림
- mutable
- 빠름
- Single Thread에서는 StringBuffer 보다 빠르다는데 확인을 못해봄 
- mutable
- 빠름
- 보통 비지니스 로직에도 String append 연산이 필요하면 씀
- 빠름, 빠른 대규모 입출력
10만번 append시 시간 1.083초 0.006초 0.003초 0.022초
  • 객체 사용시에는 String 사용
  • Coding Test에서는 빠른 입출력 필요하므로 StringBuilder/ StringBuffer/BufferedWriter 중 사용
  • 빠른 입출력 필요없는 문제라면 String 연산도 상관없음, 연산횟수가 적어지면 0초에 수렴함
  • String을 append하지말고 바로 print 하면 기존보다는 빨라짐 그러나 그래도 빠른 입출력 사용

 

package poc;

import java.io.BufferedWriter;
import java.io.IOException;
import java.io.OutputStreamWriter;

public class StringDifference {

	static final int COUNT = 100000;
	static final String sample_text = "0";
	
	public static void main(String[] args) throws Exception {

		long now;
		
		// String 
		now = System.currentTimeMillis();
		String test = "";
		for (int i = 0; i < COUNT; i++) {
			test += sample_text;
		}
		System.out.println(test);
		System.out.println("String 연산시간 : " + (System.currentTimeMillis()-now));
		
		// Buffer
		now = System.currentTimeMillis();
		StringBuffer buffer = new StringBuffer();
		for (int i = 0; i < COUNT; i++) {
			buffer.append(sample_text);
		}
		
		System.out.println(buffer.toString());
		System.out.println("StringBuilder 연산시간 : " + (System.currentTimeMillis()-now));
		
		// Builder
		now = System.currentTimeMillis();
		StringBuilder builder = new StringBuilder();
		for (int i = 0; i < COUNT; i++) {
			builder.append(sample_text);
		}
		System.out.println(builder.toString());
		System.out.println("StringBuffer연산시간 : " + (System.currentTimeMillis()-now)); 
		
		//BufferedWriter
		now = System.currentTimeMillis();
		BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(System.out));
		for (int i = 0; i < COUNT; i++) {
			bw.write(sample_text);
		}
		bw.newLine();
		bw.flush();
		System.out.println("BufferedWriter연산시간 : " + (System.currentTimeMillis()-now));
		
		
		
	}

}

 

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BufferedWriter연산시간 : 22