Java如何使用CompareToBuilder类？
本示例说明如何使用CompareToBuilder该类自动创建compareTo(Objecto)方法的实现。请记住，在实现此方法时，还需要equals(Objecto)一致地实现该方法。这将确保您的类的行为与集合排序过程相关。
package org.nhooo.example.commons.lang;
import org.apache.commons.lang3.builder.CompareToBuilder;
import org.apache.commons.lang3.builder.EqualsBuilder;
import org.apache.commons.lang3.builder.HashCodeBuilder;
public class Fruit implements Comparable<Fruit> {
private String name;
private String colour;
public Fruit(String name, String colour) {
this.name = name;
this.colour = colour;
}
public String getName() {
return name;
}
@Override
public boolean equals(Object o) {
if (this == o) return true;
if (o == null || getClass() != o.getClass()) return false;
Fruit fruit = (Fruit) o;
return new EqualsBuilder()
.append(name, fruit.name)
.append(colour, fruit.colour)
.isEquals();
}
@Override
public int hashCode() {
return new HashCodeBuilder()
.append(name)
.append(colour)
.toHashCode();
}
/*
* Generating compareTo() method using CompareToBuilder class. For other
* alternative way we can also use the CompareToBuilder.reflectionCompare()
* method to implement the compareTo() method.
*/
public int compareTo(Fruit fruit) {
return new CompareToBuilder()
.append(this.name, fruit.name)
.append(this.colour, fruit.colour)
.toComparison();
}
}package org.nhooo.example.commons.lang;
public class CompareToBuilderDemo {
public static void main(String[] args) {
Fruit fruit1 = new Fruit("Orange", "Orange");
Fruit fruit2 = new Fruit("Watermelon", "Red");
if (fruit1.compareTo(fruit2) == 0) {
System.out.printf("%s == %s%n", fruit1.getName(), fruit2.getName());
} else {
System.out.printf("%s != %s%n", fruit1.getName(), fruit2.getName());
}
}
}Maven依赖
<!-- https://search.maven.org/remotecontent?filepath=org/apache/commons/commons-lang3/3.9/commons-lang3-3.9.jar -->
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-lang3</artifactId>
<version>3.9</version>
</dependency>