最大，最小

public void test(int[] par) {
int min=par[0],max=par[0],sum=0,ave=0;
for(int i=0;i<par.length;i++) {
if(min>par[i])
min = par[i];
if(max<par[i])
max = par[i];
sum = sum + par[i];
}
ave = sum/par.length;
System.out.println("最小數：" + min);
System.out.println("最大數：" + max);
System.out.println("平均數：" + ave);
System.out.println("和：" + sum);
}

測試程序：
public void test(){
ArrayTest t = new ArrayTest();
int[] i = {1,2,3,4,5,6,7,8,31,12,5,36,54,5,753,42,4,231,34,22,3};
t.test(i);
}