package com.test4;
import java.io.*;
/**
* @author qingfeng
*
* 功能：对象数组的使用
*
* 养狗场问题：命令行输入狗的名字和体重
* 问题1：计算它们的平均体重
* 问题2：找出最大和最小狗的名字
* 问题3：输入某个狗可以显示其体重
*/
public class Object
{
public static void main(String[] args) throws IOException
{
// TODO Auto-generated method stub
Dog[] dogs = new Dog[4];//对象数组！
Float totalWeight=0f;
for(int i=0; i<dogs.length; i++)
{
dogs[i] = new Dog();//很重要!否则会报空指针错误！(因为数组存的是对象的引用)
System.out.println("请输入第"+(i+1)+"个狗的名字:");
InputStreamReader isr = new InputStreamReader(System.in);
BufferedReader br = new BufferedReader(isr);
String name = br.readLine();
dogs[i].setName(name);
System.out.println("请输入第"+(i+1)+"个狗的体重:");
String s_weight = br.readLine();
Float weight= Float.parseFloat(s_weight);
dogs[i].setWeight(weight);
totalWeight += dogs[i].getWeight();
}
System.out.println("平均重量为："+(totalWeight/dogs.length));
//选择排序思想找出最大重量和最小重量
float maxWeight;
maxWeight = dogs[0].getWeight();
int maxIndex = 0;
for(int i=1; i<dogs.length; i++)
{
if(maxWeight < dogs[i].getWeight())
{
maxWeight = dogs[i].getWeight();
maxIndex = i;
}
}
System.out.println("最大重量的狗是第"+(maxIndex+1)+"只狗，重量为"+maxWeight);
float minWeight;
minWeight = dogs[0].getWeight();
int minIndex = 0;
for(int i=1; i<dogs.length; i++)
{
if(minWeight > dogs[i].getWeight())
{
minWeight = dogs[i].getWeight();
minIndex = i;
}
}
System.out.println("最大重量的狗是第"+(minIndex+1)+"只狗，重量为"+minWeight);
InputStreamReader isr = new InputStreamReader(System.in);
BufferedReader br = new BufferedReader(isr);
String name = br.readLine();
int flag = 0;
//判断是否和数组存在的值相等
//易错点：String、对象判断相等用“equals”方法 ;int float double判断相等用“==”
for (int i = 0; i < dogs.length; i++)
{
if (dogs[i].getName().equals(name))
{
System.out.println("狗的重量为：" + dogs[i].getWeight());
flag = 1;
}
}
if (flag == 0) {
System.out.println("你输入的狗不存在！");
}
}
}
class Dog
{
//私有变量
private String name;
private float weight;
//setter和getter方法
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public float getWeight() {
return weight;
}
public void setWeight(float weight) {
this.weight = weight;
}
}
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/***********************************************************************/