<一>、字母倒着输出
题目描述:
给定一组字符串,然这组字符串中的字母按照倒着的顺序输出,空格保留。
例如:
输入:
i am a student
输出:
student am i
代码如下:
import java.util.Scanner; public class Main4 { public static void main(String[] args) { Scanner in = new Scanner(System.in); String str = in.nextLine(); String[] strs = str.split(" "); StringBuffer sb = new StringBuffer(); for(int i = strs.length - 1;i >= 0;i--) { sb = sb.append(strs[i]).append(" "); } System.out.println(sb.toString()); } }
<二>寻找最小数的字串
题目描述:
给定一组数组,用逗号分隔,求得到这组数组中数组成的最小数字。
例如:
输入:
21,321
输出;
21321
代码如下:
import java.util.ArrayList; import java.util.Collections; import java.util.Comparator; import java.util.Scanner; public class Main5 { public static void main(String[] args) { Scanner in = new Scanner(System.in); String str = in.nextLine(); String[] strs = str.split(","); int[] arr = new int[strs.length]; for(int i = 0;i < strs.length;i++) { arr[i] = Integer.valueOf(strs[i]); } mergMeth(arr); } private static void mergMeth(int[] arr){ if(arr.length == 0) { System.out.println(0); } ArrayList<Integer> list = new ArrayList<>(); for(Integer i : arr) { list.add(arr[i]); } Collections.sort(list, new Comparator<Integer>() { @Override public int compare(Integer str1, Integer str2) { String s1 = str1 +"," + str2; String s2 = str2 +"," + str1; return s1.compareTo(s2); } }); StringBuffer sb = new StringBuffer(); for(Integer j : list) { sb.append(j); } System.out.println(sb.toString()); } }