Guava ---- Range范围过滤

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本文介绍了Guava中Range的使用，使用Range和Guava的函数式编程可以用少量代码实现指定范围内容的过滤。

import com.google.common.base.Function;import com.google.common.base.Predicate;import com.google.common.base.Predicates;import com.google.common.collect.Range;/** * Guava Range类使用 * Created by wenniuwuren on 2015/6/3. */public class RangeTest {public static void main(String[] args) {Range<Integer> numberRange = Range.closed(1, 10);System.out.println("closed包含边界" + numberRange.contains(10) + " ," + numberRange.contains(1));Range<Integer> numberOpenRange = Range.open(1, 10);System.out.println("open不包含边界" + numberOpenRange.contains(1) + ", " + numberOpenRange.contains(10));Range<Integer> atLeast = Range.atLeast(10);System.out.println("大于等于边界的所有值" + atLeast);Range<Integer> lessThan = Range.lessThan(10);System.out.println("小于等于边界的所有值" + lessThan);/** *  过滤掉不符合内容Range范围的 */Range<Integer> ageRange = Range.closed(35,50);Function<Person,Integer> ageFunction = new Function<Person,Integer>() {@Overridepublic Integer apply(Person person) {return person.getAge();}};Person p1 = new Person("zhangsan", 50);Person p2 = new Person("lisi", 70);Predicate<Person> predicate = Predicates.compose(ageRange, ageFunction);System.out.println("是否包含zhangsan：" + predicate.apply(p1)+ ", 是否包含lisi：" + predicate.apply(p2));}}class Person {private String name;private Integer age;public Person(String name, Integer age) {this.name = name;this.age = age;}public Integer getAge() {return age;}public void setAge(Integer age) {this.age = age;}public String getName() {return name;}public void setName(String name) {this.name = name;}}

输出结果：

参考资料：

《Getting Started with Google Guava》

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