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tempcru 삽질기록
[JAVA] String, StringBuilder, StringBuffer, BufferedWriter 차이 본문
Algorithm/자료구조
[JAVA] String, StringBuilder, StringBuffer, BufferedWriter 차이
dev-tempcru 2022. 7. 11. 19:10String, 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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String 연산시간 : 1083
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BufferedWriter연산시간 : 22