每日日报2021 10/7
今天是国庆的最后一天。
FlowBean 对象在在需求 1 基础上增加了比较功能
package com.atguigu.mapreduce.writablecompable;
import org.apache.hadoop.io.WritableComparable;
import java.io.DataInput;
import java.io.DataOutput;
import java.io.IOException;
public class FlowBean implements WritableComparable<FlowBean> {
private long upFlow; //上行流量
private long downFlow; //下行流量
private long sumFlow; //总流量
//提供无参构造
public FlowBean() {
}
//生成三个属性的 getter 和 setter 方法
public long getUpFlow() {
return upFlow;
}
public void setUpFlow(long upFlow) {
this.upFlow = upFlow;
} 尚硅谷大数据技术之 Hadoop（MapReduce
）
public long getDownFlow() {
return downFlow;
}
public void setDownFlow(long downFlow) {
this.downFlow = downFlow;
}
public long getSumFlow() {
return sumFlow;
}
public void setSumFlow(long sumFlow) {
this.sumFlow = sumFlow;
}
public void setSumFlow() {
this.sumFlow = this.upFlow + this.downFlow;
}
//实现序列化和反序列化方法,注意顺序一定要一致
@Override
public void write(DataOutput out) throws IOException {
out.writeLong(this.upFlow);
out.writeLong(this.downFlow);
out.writeLong(this.sumFlow);
}
@Override
public void readFields(DataInput in) throws IOException {
this.upFlow = in.readLong();
this.downFlow = in.readLong();
this.sumFlow = in.readLong();
}
//重写 ToString,最后要输出 FlowBean
@Override
public String toString() {
return upFlow + "\t" + downFlow + "\t" + sumFlow;
}
@Override
public int compareTo(FlowBean o) {
//按照总流量比较,倒序排列
if(this.sumFlow > o.sumFlow){
return -1;
}else if(this.sumFlow < o.sumFlow){
return 1;
}else {
return 0;
}
}
}
