数组组成的最小数字
标题：数组组成的最小数字 | 时间限制：1秒 | 内存限制：262144K | 语言限制：不限
给定一个整型数组，请从该数组中选择3个元素组成最小数字并输出（如果数组长度小于3，则选择数组中所有元素来组成最小数字）。
import java.util.Arrays;
import java.util.Comparator;
import java.util.Scanner;
public class Main {
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
String str = sc.nextLine();
String[] split = str.split(",");
int[] newArr = null;
if (split.length < 3) {
newArr = new int[split.length];
for (int i = 0; i < split.length; i++) {
newArr[i] = Integer.parseInt(split[i]);
}
} else {
int[] intArr = new int[split.length];
for (int i = 0; i < split.length; i++) {
intArr[i] = Integer.parseInt(split[i]);
}
Arrays.sort(intArr);
newArr = Arrays.copyOf(intArr, 3);
}
String minCombine = printMinNumber(newArr);
System.out.println(minCombine);
}
private static String printMinNumber(int[] newArr) {
if (newArr == null || newArr.length == 0) {
return "";
}
int length = newArr.length;
String[] strArr = new String[length];
for (int i = 0; i < length; i++) {
strArr[i] = String.valueOf(newArr[i]);
}
StringBuilder sb = new StringBuilder();
Arrays.sort(strArr, new Comparator<String>() {
@Override
public int compare(String o1, String o2) {
String c1 = o1 + o2;
String c2 = o2 + o1;
return c1.compareTo(c2);
}
});
for (int i = 0; i < length; i++) {
sb.append(strArr[i]);
}
return sb.toString();
}
}
