lang/java

java filter speed Test

C/H 2021. 12. 31. 02:09
import java.util.*;
import java.util.stream.Collectors;

public class helloWorld {
    public static void main(String[] args) {
        List<Student> students = new ArrayList<>();
        for(int i = 0; i <= 99999; i++){
            students.add(new Student("A", i, i % 3 == 0 ? "M" : "F"));
            students.add(new Student("B", i, i % 3 == 0 ? "M" : "F"));
            students.add(new Student("C", i, i % 3 == 0 ? "M" : "F"));
        }

        System.out.println("sutudents size: " + students.size());

        List<Student> listA1 = new ArrayList<>(),
                listB1 = new ArrayList<>(),
                listC1 = new ArrayList<>();
        long begin = System.nanoTime();
        for (Student student : students) {
            String name = student.getName();
            if (name.equals("A")) listA1.add(student);
            else if (name.equals("B")) listB1.add(student);
            else if (name.equals("C")) listC1.add(student);
        }
        System.out.println("EliipsesTime01: " + (System.nanoTime() - begin) + " ns");
        System.out.println("A1.size: " + listA1.size() + ", B1.size: " + listB1.size() + ", listC1.size: " + listC1.size());

        List<Student> listA2 = new ArrayList<>(),
                listB2 = new ArrayList<>(),
                listC2 = new ArrayList<>();
        long begin2 = System.nanoTime();
        for (Student student : students) {
            switch (student.getName()) {
                case "A": listA2.add(student);break;
                case "B": listB2.add(student);break;
                case "C": listC2.add(student);break;
                default: break;
            }
        }
        System.out.println("EliipsesTime02: " + (System.nanoTime() - begin2) + " ns");
        System.out.println("A2.size: " + listA2.size() + ", B2.size: " + listB2.size() + ", listC2.size: " + listC2.size());

        long begin11 = System.nanoTime();
        List<Student> listA11 = students.stream().filter(o -> o.getName().equals("A")).collect(Collectors.toList());
        List<Student> listB11 = students.stream().filter(o -> o.getName().equals("B")).collect(Collectors.toList());
        List<Student> listC11 = students.stream().filter(o -> o.getName().equals("C")).collect(Collectors.toList());
        System.out.println("EliipsesTime11: " + (System.nanoTime() - begin11) + " ns");
        System.out.println("A11.size: " + listA11.size() + ", B11.size: " + listB11.size() + ", listC11.size: " + listC11.size());

        long begin12 = System.nanoTime();
        List<Student> listA12 = students.parallelStream().filter(o -> o.getName().equals("A")).collect(Collectors.toList());
        List<Student> listB12 = students.parallelStream().filter(o -> o.getName().equals("B")).collect(Collectors.toList());
        List<Student> listC14 = students.parallelStream().filter(o -> o.getName().equals("C")).collect(Collectors.toList());
        System.out.println("EliipsesTime12: " + (System.nanoTime() - begin12) + " ns");
        System.out.println("A12.size: " + listA12.size() + ", B12.size: " + listB12.size() + ", listC12.size: " + listC14.size());
    }
}

class Student {
    private String name = "";
    private int age = 0;
    private String sex = "";

    public Student(String name, int age, String sex) {
        this.name = name;
        this.age = age;
        this.sex = sex;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }

    public String getSex() {
        return sex;
    }

    public void setSex(String sex) {
        this.sex = sex;
    }
}
/usr/lib/jvm/java-8-openjdk-amd64/bin/java -javaagent:/home/uncaose/.local/share/JetBrains/Toolbox/apps/IDEA-U/ch-0/213.6461.79/lib/idea_rt.jar=41779:/home/uncaose/.local/share/JetBrains/Toolbox/apps/IDEA-U/ch-0/213.6461.79/bin -Dfile.encoding=UTF-8 -classpath /usr/lib/jvm/java-8-openjdk-amd64/jre/lib/charsets.jar:/usr/lib/jvm/java-8-openjdk-amd64/jre/lib/ext/cldrdata.jar:/usr/lib/jvm/java-8-openjdk-amd64/jre/lib/ext/dnsns.jar:/usr/lib/jvm/java-8-openjdk-amd64/jre/lib/ext/icedtea-sound.jar:/usr/lib/jvm/java-8-openjdk-amd64/jre/lib/ext/jaccess.jar:/usr/lib/jvm/java-8-openjdk-amd64/jre/lib/ext/java-atk-wrapper.jar:/usr/lib/jvm/java-8-openjdk-amd64/jre/lib/ext/localedata.jar:/usr/lib/jvm/java-8-openjdk-amd64/jre/lib/ext/nashorn.jar:/usr/lib/jvm/java-8-openjdk-amd64/jre/lib/ext/sunec.jar:/usr/lib/jvm/java-8-openjdk-amd64/jre/lib/ext/sunjce_provider.jar:/usr/lib/jvm/java-8-openjdk-amd64/jre/lib/ext/sunpkcs11.jar:/usr/lib/jvm/java-8-openjdk-amd64/jre/lib/ext/zipfs.jar:/usr/lib/jvm/java-8-openjdk-amd64/jre/lib/jce.jar:/usr/lib/jvm/java-8-openjdk-amd64/jre/lib/jfr.jar:/usr/lib/jvm/java-8-openjdk-amd64/jre/lib/jsse.jar:/usr/lib/jvm/java-8-openjdk-amd64/jre/lib/management-agent.jar:/usr/lib/jvm/java-8-openjdk-amd64/jre/lib/resources.jar:/usr/lib/jvm/java-8-openjdk-amd64/jre/lib/rt.jar:/home/uncaose/Projects/Java/helloWorld/out/production/Java helloWorld
sutudents size: 300000
EliipsesTime01: 13322717 ns
A1.size: 100000, B1.size: 100000, listC1.size: 100000
EliipsesTime02: 14319003 ns
A2.size: 100000, B2.size: 100000, listC2.size: 100000
EliipsesTime11: 70470831 ns
A11.size: 100000, B11.size: 100000, listC11.size: 100000
EliipsesTime12: 29156341 ns
A12.size: 100000, B12.size: 100000, listC12.size: 100000

Process finished with exit code 0


/usr/lib/jvm/java-8-openjdk-amd64/bin/java -javaagent:/home/uncaose/.local/share/JetBrains/Toolbox/apps/IDEA-U/ch-0/213.6461.79/lib/idea_rt.jar=33691:/home/uncaose/.local/share/JetBrains/Toolbox/apps/IDEA-U/ch-0/213.6461.79/bin -Dfile.encoding=UTF-8 -classpath /usr/lib/jvm/java-8-openjdk-amd64/jre/lib/charsets.jar:/usr/lib/jvm/java-8-openjdk-amd64/jre/lib/ext/cldrdata.jar:/usr/lib/jvm/java-8-openjdk-amd64/jre/lib/ext/dnsns.jar:/usr/lib/jvm/java-8-openjdk-amd64/jre/lib/ext/icedtea-sound.jar:/usr/lib/jvm/java-8-openjdk-amd64/jre/lib/ext/jaccess.jar:/usr/lib/jvm/java-8-openjdk-amd64/jre/lib/ext/java-atk-wrapper.jar:/usr/lib/jvm/java-8-openjdk-amd64/jre/lib/ext/localedata.jar:/usr/lib/jvm/java-8-openjdk-amd64/jre/lib/ext/nashorn.jar:/usr/lib/jvm/java-8-openjdk-amd64/jre/lib/ext/sunec.jar:/usr/lib/jvm/java-8-openjdk-amd64/jre/lib/ext/sunjce_provider.jar:/usr/lib/jvm/java-8-openjdk-amd64/jre/lib/ext/sunpkcs11.jar:/usr/lib/jvm/java-8-openjdk-amd64/jre/lib/ext/zipfs.jar:/usr/lib/jvm/java-8-openjdk-amd64/jre/lib/jce.jar:/usr/lib/jvm/java-8-openjdk-amd64/jre/lib/jfr.jar:/usr/lib/jvm/java-8-openjdk-amd64/jre/lib/jsse.jar:/usr/lib/jvm/java-8-openjdk-amd64/jre/lib/management-agent.jar:/usr/lib/jvm/java-8-openjdk-amd64/jre/lib/resources.jar:/usr/lib/jvm/java-8-openjdk-amd64/jre/lib/rt.jar:/home/uncaose/Projects/Java/helloWorld/out/production/Java helloWorld
sutudents size: 300000
EliipsesTime01: 19656517 ns
A1.size: 100000, B1.size: 100000, listC1.size: 100000
EliipsesTime02: 12744903 ns
A2.size: 100000, B2.size: 100000, listC2.size: 100000
EliipsesTime11: 71352798 ns
A11.size: 100000, B11.size: 100000, listC11.size: 100000
EliipsesTime12: 28338458 ns
A12.size: 100000, B12.size: 100000, listC12.size: 100000

Process finished with exit code 0
/usr/lib/jvm/java-1.11.0-openjdk-amd64/bin/java -javaagent:/home/uncaose/.local/share/JetBrains/Toolbox/apps/IDEA-U/ch-0/213.6461.79/lib/idea_rt.jar=40327:/home/uncaose/.local/share/JetBrains/Toolbox/apps/IDEA-U/ch-0/213.6461.79/bin -Dfile.encoding=UTF-8 -classpath /home/uncaose/Projects/Java/helloWorld/out/production/Java helloWorld
sutudents size: 300000
EliipsesTime01: 11519402 ns
A1.size: 100000, B1.size: 100000, listC1.size: 100000
EliipsesTime02: 10697319 ns
A2.size: 100000, B2.size: 100000, listC2.size: 100000
EliipsesTime11: 41825493 ns
A11.size: 100000, B11.size: 100000, listC11.size: 100000
EliipsesTime12: 34319151 ns
A12.size: 100000, B12.size: 100000, listC12.size: 100000

Process finished with exit code 0

/usr/lib/jvm/java-1.11.0-openjdk-amd64/bin/java -javaagent:/home/uncaose/.local/share/JetBrains/Toolbox/apps/IDEA-U/ch-0/213.6461.79/lib/idea_rt.jar=42073:/home/uncaose/.local/share/JetBrains/Toolbox/apps/IDEA-U/ch-0/213.6461.79/bin -Dfile.encoding=UTF-8 -classpath /home/uncaose/Projects/Java/helloWorld/out/production/Java helloWorld
sutudents size: 300000
EliipsesTime01: 12191750 ns
A1.size: 100000, B1.size: 100000, listC1.size: 100000
EliipsesTime02: 18121540 ns
A2.size: 100000, B2.size: 100000, listC2.size: 100000
EliipsesTime11: 42957843 ns
A11.size: 100000, B11.size: 100000, listC11.size: 100000
EliipsesTime12: 53593287 ns
A12.size: 100000, B12.size: 100000, listC12.size: 100000

Process finished with exit code 0
/usr/lib/jvm/java-1.17.0-openjdk-amd64/bin/java -javaagent:/home/uncaose/.local/share/JetBrains/Toolbox/apps/IDEA-U/ch-0/213.6461.79/lib/idea_rt.jar=43265:/home/uncaose/.local/share/JetBrains/Toolbox/apps/IDEA-U/ch-0/213.6461.79/bin -Dfile.encoding=UTF-8 -classpath /home/uncaose/Projects/Java/helloWorld/out/production/Java helloWorld
sutudents size: 300000
EliipsesTime01: 12025406 ns
A1.size: 100000, B1.size: 100000, listC1.size: 100000
EliipsesTime02: 13400851 ns
A2.size: 100000, B2.size: 100000, listC2.size: 100000
EliipsesTime11: 42708709 ns
A11.size: 100000, B11.size: 100000, listC11.size: 100000
EliipsesTime12: 16916257 ns
A12.size: 100000, B12.size: 100000, listC12.size: 100000

Process finished with exit code 0

/usr/lib/jvm/java-1.17.0-openjdk-amd64/bin/java -javaagent:/home/uncaose/.local/share/JetBrains/Toolbox/apps/IDEA-U/ch-0/213.6461.79/lib/idea_rt.jar=44303:/home/uncaose/.local/share/JetBrains/Toolbox/apps/IDEA-U/ch-0/213.6461.79/bin -Dfile.encoding=UTF-8 -classpath /home/uncaose/Projects/Java/helloWorld/out/production/Java helloWorld
sutudents size: 300000
EliipsesTime01: 10287032 ns
A1.size: 100000, B1.size: 100000, listC1.size: 100000
EliipsesTime02: 9839069 ns
A2.size: 100000, B2.size: 100000, listC2.size: 100000
EliipsesTime11: 45944234 ns
A11.size: 100000, B11.size: 100000, listC11.size: 100000
EliipsesTime12: 16374561 ns
A12.size: 100000, B12.size: 100000, listC12.size: 100000

Process finished with exit code 0

Conclose

  • Vanila Collection for + if, for + switch case 가 빠르다.
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