最大最小值

package aaa;
import java.io.*;
public class aaa {
public static void main(String[] args)throws IOException{
double max,min;
BufferedReader keyboard= new BufferedReader(new InputStreamReader(System.in));
String inputString = keyboard.readLine();
BufferedReader keyboard1= new BufferedReader(new InputStreamReader(System.in));
String inputString1 = keyboard1.readLine();
double next1 = Double.parseDouble(inputString1);
BufferedReader keyboard2= new BufferedReader(new InputStreamReader(System.in));
String inputString2 = keyboard2.readLine();
double next2 = Double.parseDouble(inputString2);
BufferedReader keyboard4= new BufferedReader(new InputStreamReader(System.in));
String inputString4 = keyboard4.readLine();
double next4 = Double.parseDouble(inputString4);

if(next2>next1)
{max=next2;
min=next1;}
else{
max=next1;
min=next2;
}
if (next4>max)
max=next4;
else if(next4
{min=next4;
}
System.out.println("最大的值是"+max);
System.out.println("最小的值是"+min);
}
}

執行的結果