crest value &minimum

public class paixu {public static void main(String[] args) {    double temp;    double num[]={5.1, 7.12, 1.2, 5.21};    for(int i=0; i<3; i++)        for(int k=i+1; k<4; k++)            if(num[i]>num[k])                {                       temp=num[i];                       num[i]=num[k];                       num[k]=temp;                }   System.out.println("最大："+num[3]+" 最小: "+num[0]);}}