Correct output but does not meet the 4th requirement.

package zh.codegym.task.task08.task0823; import java.io.BufferedReader; import java.io.IOException; import java.io.InputStreamReader; import java.lang.reflect.Array; import java.util.Arrays; import java.util.Collections; import java.util.List; /* 走向全国 */ public class Solution { public static void main(String[] args) throws IOException { BufferedReader reader = new BufferedReader(new InputStreamReader(System.in)); String s = reader.readLine().trim(); //在此编写你的代码 String[] s1 = s.split("\\s+"); String result=""; for(int i=0;i<s1.length;i++){ s1[i]=s1[i].substring(0,1).toUpperCase()+s1[i].substring(1); if(i<s1.length-1){ result=result+s1[i]+" "; }else { result=result+s1[i]; } } System.out.println(result); } }

String s = reader.readLine().trim();
string[] s1 = s.split("\\s+");

只要输入时包含去头尾空格, 还有分隔的时候以多个空格分隔就行了, 就像上面两句

为什么按照你这个就满足不了最后一个条件呢 它输出也没问题啊

public static void main(String[] args) throws IOException { BufferedReader reader = new BufferedReader(new InputStreamReader(System.in)); String s = reader.readLine(); //在此编写你的代码 String[] arr = s.split("\\s+"); for(int i=0;i< arr.length; i++){ String current = arr[i]; if(current == null || current.isEmpty()){ continue; } String first = current.substring(0,1); arr[i] = first.toUpperCase() + current.substring(1); } System.out.println(String.join(" ", arr)); }

这道题为什么用isLetter可以通过 用char[i]>='a'&&char[i]<='z'不能通过呢

public class Solution { public static void main(String[] args) { Scanner sc = new Scanner(System.in); String s = sc.nextLine(); char[] c = s.toCharArray(); if (c[0] > 96 && c[0] < 123) //判断首字母是否为小写，在ASCII码表中，‘a’是第97位，‘z’是第122位 c[0] = (char) (c[0] - 32); for (int i = 1; i < c.length - 1; i++) { // //首字母已经进行了判断，所以从1开始 if (c[i] == 32 && c[i + 1] > 96 && c[i + 1] < 123) //判断c[i]是否为空格（空格在ASCII码表中是第32位），并且它下一个字母是否为小写 c[i + 1] = (char) (c[i + 1] - 32);//如果是，转为大写 } if(c[0] == 32)//考虑首字母为空格的情况 c[1] = (char) (c[1] - 32); for (char d : c) { System.out.print(d); } //在此编写你的代码 } }

package zh.codegym.task.task08.task0823; import java.io.BufferedReader; import java.io.IOException; import java.io.InputStreamReader; /* 走向全国 */ public class Solution { public static void main(String[] args) throws IOException { BufferedReader reader = new BufferedReader(new InputStreamReader(System.in)); String s = reader.readLine(); String[] L=s.split(" "); for(int i=0;i<L.length;i++) { System.out.print(L[i].substring(0,1).toUpperCase()+L[i].substring(1).toLowerCase()+" "); } //在此编写你的代码 } }

两个单词之间可能存在超过一个的空格

public class Solution {
    public static void main(String[] args) throws IOException {
        BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
        String s = reader.readLine();
        char[] ch = s.toCharArray();
        ch[0] = Character.toUpperCase(ch[0]);
        for (int i = 0; i < ch.length - 1; i++) {
            if (Character.isLetter(ch[i + 1]) && ch[i] == ' ') {
                ch[i + 1] = Character.toUpperCase(ch[i + 1]);
            }
        }
        String result = new String(ch);

        System.out.println(result);
    }
}

我也卡了蛮久... 用trim()函数去掉句首和句尾的空格 用split(" +")来分隔有多个空格的字符串