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public class Minmax {

public static int [] minmax( int [] a) {
if (a.length==0){
return null; 
}
int max = a[0];
int min = a[0];

for (int i=1; i<a.length; i++){
if ( a[i]>max){
max = a[i];
}
if ( a[i]<min) {
min = a[i];
}
}
return new int[] {min, max};
}

public static void main (String [] args){
int [] a={0,-1, 1, 3, 3};
int [] z= minmax(a);
int min =z[0];
int max =z[1];
System.out.println("min:" + min);
System.out.println("max:" + max);
}
}