Created
July 17, 2012 00:23
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Benchmark string concatenation (version 1)
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import java.util.HashMap; | |
import org.apache.commons.lang3.RandomStringUtils; | |
import com.google.caliper.Runner; | |
import com.google.caliper.SimpleBenchmark; | |
public class StringConcat extends SimpleBenchmark { | |
private final static int CONCATENATIONS = 5; | |
private HashMap<Integer, String> strings = new HashMap<Integer, String>(); | |
@Override | |
protected void setUp() throws Exception { | |
super.setUp(); | |
strings.clear(); | |
for (int i = 0; i < CONCATENATIONS; i++) { | |
String s = RandomStringUtils.randomAlphabetic(10); | |
strings.put(i, s); | |
} | |
} | |
/** | |
* Use '+' to concat strings | |
* @param reps | |
*/ | |
public void timeStringAddition(int reps) { | |
for (int n = 0; n < reps; n++) { | |
String concat = strings.get(0) + strings.get(1) + strings.get(2) + strings.get(3) + strings.get(4); | |
} | |
} | |
/** | |
* Use {@link StringBuilder} to concat strings | |
* @param reps | |
*/ | |
public void timeStringBuilder(int reps) { | |
for (int n = 0; n < reps; n++) { | |
StringBuilder sb = new StringBuilder(); | |
String concat = sb.append(strings.get(0)).append(strings.get(1)).append(strings.get(2)).append(strings.get(3)).append(strings.get(4)).toString(); | |
} | |
} | |
/** | |
* Use {@link StringBuffer} to concat strings | |
* @param reps | |
*/ | |
public void timeStringBuffer(int reps) { | |
for (int n = 0; n < reps; n++) { | |
StringBuffer sb = new StringBuffer(); | |
String concat = sb.append(strings.get(0)).append(strings.get(1)).append(strings.get(2)).append(strings.get(3)).append(strings.get(4)).toString(); | |
} | |
} | |
public static void main(String... args) throws Exception { | |
Runner.main(StringConcat.class, args); | |
} | |
} |
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