JOL

原创转载请注明出处：https://www.cnblogs.com/agilestyle/p/14985105.html

Maven Depedency

...
<dependencies>
    <dependency>
        <groupId>org.projectlombok</groupId>
        <artifactId>lombok</artifactId>
        <version>1.18.20</version>
    </dependency>

    <dependency>
        <groupId>org.openjdk.jol</groupId>
        <artifactId>jol-core</artifactId>
        <version>0.16</version>
    </dependency>
</dependencies>
...

SRC

package org.fool.test;

import lombok.Data;
import org.openjdk.jol.info.ClassLayout;

import java.math.BigDecimal;
import java.math.BigInteger;

@Data
public class JolTest {
    private byte b;
    private boolean flag;
    private char c;
    private int i;
    private float f;
    private double d;
    private long l;
    private Byte wrapperB;
    private Boolean wrapperFlag;
    private Character wrapperC;
    private Integer wrapperI;
    private Float wrapperF;
    private Double wrapperD;
    private Long wrapperL;
    private BigInteger bigInteger;
    private BigDecimal bigDecimal;
    private String str;
    private Object object;

    public static void main(String[] args) {
        JolTest jolTest = new JolTest();
        jolTest.setB((byte) 1);
        jolTest.setFlag(true);
        jolTest.setC('a');
        jolTest.setI(1);
        jolTest.setF(2f);
        jolTest.setD(3.0);
        jolTest.setL(4L);
        jolTest.setWrapperB(new Byte("1"));
        jolTest.setWrapperFlag(new Boolean(false));
        jolTest.setWrapperC(new Character('c'));
        jolTest.setWrapperI(new Integer(1));
        jolTest.setWrapperF(new Float(2));
        jolTest.setWrapperD(new Double(3.0));
        jolTest.setWrapperL(new Long(4));
        jolTest.setBigInteger(new BigInteger("100000000000"));
        jolTest.setBigDecimal(new BigDecimal("999999999999.999"));
        jolTest.setStr("string");
        jolTest.setObject(new Object());
        System.out.println(ClassLayout.parseInstance(jolTest).toPrintable());
    }
}

Console Output

Reference

https://segmentfault.com/a/1190000012354736

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