com.github.zhangxd1989.basetool.comparator.ComparableComparator Maven / Gradle / Ivy

package com.github.zhangxd1989.basetool.comparator;

import java.io.Serializable;
import java.util.Comparator;

/**
 * 针对 {@link Comparable}对象的默认比较器
 *
 * @param  比较对象类型
 * @author sheldon
 */
public class ComparableComparator> implements Comparator, Serializable {

    private static final long serialVersionUID = -7324451369247817414L;

    /**
     * 单例
     */
    @SuppressWarnings("rawtypes")
    public static final ComparableComparator INSTANCE = new ComparableComparator<>();

    /**
     * 构造
     */
    public ComparableComparator() {
        super();
    }

    /**
     * 比较两个{@link Comparable}对象
     *      * obj1.compareTo(obj2)
     * 
     *
     * @param obj1 被比较的第一个对象
     * @param obj2 the second object to compare
     * @return obj1小返回负数，大返回正数，否则返回0
     * @throws NullPointerException obj1为{@code null}或者比较中抛出空指针异常
     */
    @Override
    public int compare(final E obj1, final E obj2) {
        return obj1.compareTo(obj2);
    }

    @Override
    public int hashCode() {
        return "ComparableComparator".hashCode();
    }

    @Override
    public boolean equals(final Object object) {
        return this == object || null != object && object.getClass().equals(this.getClass());
    }

}