These days POJO's (Plain Old Java Objects) are used in all kinds of Java Projects.
A Typical POJO consists of fields, all related getters/setters, and sometimes equals() & hashCode() methods.
Sample POJO:
public class Product {
private Integer Id;
private String name;
public Integer getId() {
return Id;
}
public void setId(Integer id) {
Id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
@Override
public boolean equals(Object obj) {
//equality logic
}
@Override
public int hashCode() {
//some logic
}
}
By using lombok jar, we can simulate getters/setters methods, equals() method, hashCode() method and many other features. To simulate these methods just you need to use their respective annotations. Every feature has its own annotations.
For Example: To simulate setter methods - just use @Setter on the required fields
@Setter
private Integer Id;
@Setter
private String name;
First you need to download the lombok.jar Lombok.jar
Different IDE's has different way of configuring lombok jar - If you would want to use in eclipse IDE - need to install first.
Usage on other IDEs can be found at Download link page.
Installing lombok on Eclipse:
>> open commond prompt - > go to lombok jar directory
(If not downloaded lombok.jar - do it first)
>> run the jar using the following command
<path to lombok jar>$ java -jar lombok.jar
>> This opens a lombok installer window
>> Now, Click the Specify location.. - select the eclipse IDE installation location.
>> In the above dialog, you must browse to Eclipse IDE installation directory and must choose eclipse.ini as labelled orange in the above pic.
>>Click Select
>> Given a correct installation directory - goes to the above screen. Click Install/Update.
You are done with installation of Lombok.
(If you observe IDE directory - a copy lombok.jar would be added to IDE installation directory.)
**Note:
Even though, you have installed lombok on eclipse IDE- you need lombok jar file on your classpath again.
So, In my example I using a lombok maven dependecny (so it automatically get my jar to the classpath)
Maven Dependency:
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<version>1.16.2</version>
</dependency>
Sample POJO with lombok annoations:
@Setter - To Simulate Setter Methods
@Getter - To Simulate Getter Methods
@ToString - toString Method
@EqualsAndHashCode - To Simulate equals and hashcode Methods.
This POJO is equivalent to the Sample POJO above.
We can test this POJO by writing a simple TestNG test:
Also add a TestNG jar to run your tests successfully:
More Features: lombok features
Please Share - Hope you like it.
A Typical POJO consists of fields, all related getters/setters, and sometimes equals() & hashCode() methods.
Sample POJO:
public class Product {
private Integer Id;
private String name;
public Integer getId() {
return Id;
}
public void setId(Integer id) {
Id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
@Override
public boolean equals(Object obj) {
//equality logic
}
@Override
public int hashCode() {
//some logic
}
}
By using lombok jar, we can simulate getters/setters methods, equals() method, hashCode() method and many other features. To simulate these methods just you need to use their respective annotations. Every feature has its own annotations.
For Example: To simulate setter methods - just use @Setter on the required fields
@Setter
private Integer Id;
@Setter
private String name;
First you need to download the lombok.jar Lombok.jar
Different IDE's has different way of configuring lombok jar - If you would want to use in eclipse IDE - need to install first.
Usage on other IDEs can be found at Download link page.
Installing lombok on Eclipse:
>> open commond prompt - > go to lombok jar directory
(If not downloaded lombok.jar - do it first)
>> run the jar using the following command
<path to lombok jar>$ java -jar lombok.jar
>> This opens a lombok installer window
>> Now, Click the Specify location.. - select the eclipse IDE installation location.
>> In the above dialog, you must browse to Eclipse IDE installation directory and must choose eclipse.ini as labelled orange in the above pic.
>>Click Select
>> Given a correct installation directory - goes to the above screen. Click Install/Update.
You are done with installation of Lombok.
(If you observe IDE directory - a copy lombok.jar would be added to IDE installation directory.)
**Note:
Even though, you have installed lombok on eclipse IDE- you need lombok jar file on your classpath again.
So, In my example I using a lombok maven dependecny (so it automatically get my jar to the classpath)
Maven Dependency:
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<version>1.16.2</version>
</dependency>
Sample POJO with lombok annoations:
package com.examples;
import lombok.EqualsAndHashCode;
import lombok.Getter;
import lombok.Setter;
import lombok.ToString;
@ToString
@EqualsAndHashCode
public class Product {
@Setter
@Getter
private Integer Id;
@Setter
@Getter
private String name;
}
@Setter - To Simulate Setter Methods
@Getter - To Simulate Getter Methods
@ToString - toString Method
@EqualsAndHashCode - To Simulate equals and hashcode Methods.
This POJO is equivalent to the Sample POJO above.
We can test this POJO by writing a simple TestNG test:
Also add a TestNG jar to run your tests successfully:
package com.test;
import org.testng.annotations.Test;
import org.testng.annotations.BeforeMethod;
import org.testng.Assert;
import com.examples.Product;
public class LombokTest {
Product product1 = new Product();
Product product2 = new Product();
@BeforeMethod
public void setUp() {
// accessing setters on POJO
product1.setId(1);
product1.setName("Washing Machine");
product2.setId(2);
product2.setName("Gas Stove");
}
@Test
public void testProducts() {
// accessing getters
Assert.assertEquals("Washing Machine", product1.getName());
Assert.assertEquals("Gas Stove", product2.getName());
}
@Test
public void testObjectEquality() {
// shows they are different objects
Assert.assertNotEquals(product1, product2);
}
}
Download Complete Example: Source CodeMore Features: lombok features
Please Share - Hope you like it.
