Guava使用笔记系列之Objects …

主要有三个方法吧: equals,hashCode,compareTo

package com.qunar.google.guava;

import com.google.common.base.MoreObjects;

import com.google.common.base.Objects;

import com.google.common.collect.ComparisonChain;

import java.math.BigDecimal;

public class OrderVo implements Comparable {

    private Long id;

    private StringorderNo;

    private StringcreateTime;

    private BigDecimalmoney;

    public Long getId(){

       return id;

    }

    public void setId(Longid) {

       this.id = id;

    }

    public StringgetOrderNo() {

       return orderNo;

    }

    public voidsetOrderNo(String orderNo) {

       this.orderNo = orderNo;

    }

    public StringgetCreateTime() {

       return createTime;

    }

    public voidsetCreateTime(String createTime) {

       this.createTime = createTime;

    }

    public BigDecimalgetMoney() {

       return money;

    }

    public voidsetMoney(BigDecimal money) {

       this.money = money;

    }

    @Override

    public intcompareTo(OrderVo o) {

       returnComparisonChain.start().compare(this.getId(),o.getId()).compare(this.orderNo,o.orderNo).compare(this.getMoney(), o.getMoney()).result();

    }

    @Override

    public String toString(){

       returnMoreObjects.toStringHelper(this).toString();

    }

    @Override

    public int hashCode(){

       return Objects.hashCode(this.getId(),this.getOrderNo(), this.getMoney(), this.getCreateTime());

    }

    @Override

    public booleanequals(Object obj) {

       return Objects.equal(this,obj);

    }

}

ThrowableUtils 的使用.

package com.qunar.google.guava;

import com.google.common.base.Throwables;

import org.apache.commons.exec.util.MapUtils;

import org.apache.commons.io.FileUtils;

import java.io.File;

import java.io.FileOutputStream;

import java.io.IOException;

public class ThrowableUtilsTest {

    public static voidmain(String[] args) {

       try {

          FileUtils.copyFile(new File("D:/1.txt"), newFileOutputStream("D:/2.txt"));

       } catch (IOException e) {

           throwThrowables.propagate(e.getCause());//这种方式比我们手动的throw newRuntimException更加优雅

       }catch (Exception e){

           throwThrowables.propagate(e);

       }

    }

}