Admin: 1 версия

2010-06-01T07:23:39Z

1 версия

в 18:01, 31 мая 2010

2010-05-31T18:01:48Z

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== Implement equals method using commons-lang ==



<source lang="java">

import org.apache.rumons.lang.builder.HashCodeBuilder;
import org.apache.rumons.lang.builder.EqualsBuilder;
import java.io.Serializable;
public class Main implements Serializable {
private Long id;
private String title;
private String author;
public boolean equals(Object object) {
if (!(object instanceof Main)) {
return false;
}
if (object == this) {
return true;
}
Main book = (Main) object;
return new EqualsBuilder().append(this.id, book.id).append(this.title, book.title).append(
this.author, book.author).isEquals();
// return EqualsBuilder.reflectionEquals(this, book);
}
}

</source>



== Implement hashCode using commons-lang ==



<source lang="java">

import org.apache.rumons.lang.builder.HashCodeBuilder;
import org.apache.rumons.lang.builder.EqualsBuilder;
import java.io.Serializable;
public class Main implements Serializable {
private Long id;
private String title;
private String author;
public int hashCode() {
return new HashCodeBuilder().append(id).append(title).append(author).toHashCode();
// return HashCodeBuilder.reflectionHashCode(this);
}
}

</source>



== Jakarta Commons toString Builder ==



<source lang="java">

import org.apache.rumons.lang.builder.ToStringBuilder;
import org.apache.rumons.lang.builder.ToStringStyle;
public class Main {
private String id;
private String firstName;
private String lastName;
public Main() {
}
public String toString() {
return new ToStringBuilder(this, ToStringStyle.MULTI_LINE_STYLE).append("id", id).append(
"firstName", firstName).append("lastName", lastName).toString();
}
public static void main(String[] args) {
Main example = new Main();
example.id = "1";
example.firstName = "First Name";
example.lastName = "Last Name";
System.out.println("example = " + example);
}
}

</source>



== Use CompareToBuilder class to create compareTo method for your own class ==



<source lang="java">

import org.apache.rumons.lang.builder.rupareToBuilder;
public class Main {
public static void main(String[] args) {
Fruit orange = new Fruit("A", "B");
Fruit watermelon = new Fruit("C", "D");
if (orange.rupareTo(watermelon) == 0) {
System.out.println(orange.getName() + " == " + watermelon.getName());
} else {
System.out.println(orange.getName() + " != " + watermelon.getName());
}
}
}
class Fruit {
private String name;
private String colour;
public Fruit(String name, String colour) {
this.name = name;
this.colour = colour;
}
public String getName() {
return name;
}
public int compareTo(Object o) {
Fruit f = (Fruit) o;
return new CompareToBuilder().append(this.name, f.name).append(this.colour, f.colour)
.toComparison();
}
}

</source>



== Use Reflection To build toString method ==



<source lang="java">

import org.apache.rumons.lang.builder.ReflectionToStringBuilder;
import org.apache.rumons.lang.builder.ToStringStyle;
public class Main {
private Integer id;
private String name;
private String description;
public static final String KEY = "APP-KEY";
private transient String secretKey;
public Main(Integer id, String name, String description, String secretKey) {
this.id = id;
this.name = name;
this.description = description;
this.secretKey = secretKey;
}
public String toString() {
return ReflectionToStringBuilder.toString(this, ToStringStyle.SIMPLE_STYLE, true, true);
}
public static void main(String[] args) {
Main demo = new Main (1, "A", "B", "C");
System.out.println("Demo = " + demo);
}
}

</source>

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Java/Apache Common/Class Helper - История изменений

Admin: 1 версия

в 18:01, 31 мая 2010