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Added the JOL Examples

This commit is contained in:
Ali Dehghani 2020-07-02 13:16:53 +04:30
parent eff6ed12e6
commit a222727c3e
3 changed files with 75 additions and 0 deletions
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10
core-java-modules/core-java-jvm-2/src/test/java/com/baeldung/objectsize/Course.java Normal file
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package com.baeldung.objectsize;
public class Course {
private String name;
public Course(String name) {
this.name = name;
}
}

40
core-java-modules/core-java-jvm-2/src/test/java/com/baeldung/objectsize/ObjectSizeUnitTest.java Normal file
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package com.baeldung.objectsize;
import org.junit.Test;
import org.openjdk.jol.info.ClassLayout;
import org.openjdk.jol.info.GraphLayout;
import org.openjdk.jol.vm.VM;
public class ObjectSizeUnitTest {
@Test
public void printingTheVMDetails() {
System.out.println(VM.current().details());
}
@Test
public void printingTheProfClassLayout() {
System.out.println(ClassLayout.parseClass(Professor.class).toPrintable());
}
@Test
public void printingTheCourseClassLayout() {
System.out.println(ClassLayout.parseClass(Course.class).toPrintable());
}
@Test
public void printingACourseInstanceLayout() {
String ds = "Data Structures";
Course course = new Course(ds);
System.out.println("The shallow size is :" + VM.current().sizeOf(course));
System.out.println(ClassLayout.parseInstance(course).toPrintable());
System.out.println(ClassLayout.parseInstance(ds).toPrintable());
System.out.println(ClassLayout.parseInstance(ds.toCharArray()).toPrintable());
System.out.println(GraphLayout.parseInstance(course).totalSize());
System.out.println(GraphLayout.parseInstance(course).toFootprint());
System.out.println(GraphLayout.parseInstance(course).toPrintable());
}
}

25
core-java-modules/core-java-jvm-2/src/test/java/com/baeldung/objectsize/Professor.java Normal file
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package com.baeldung.objectsize;
import java.time.LocalDate;
import java.util.ArrayList;
import java.util.List;
public class Professor {
private String name;
private boolean tenured;
private List<Course> courses;
private int level;
private LocalDate birthDay;
private double lastEvaluation;
public Professor(String name, boolean tenured, List<Course> courses,
int level, LocalDate birthDay, double lastEvaluation) {
this.name = name;
this.tenured = tenured;
this.courses = courses;
this.level = level;
this.birthDay = birthDay;
this.lastEvaluation = lastEvaluation;
}
}