java - 如何在不使用 split() 的情况下提取名字和中间名的首字母和姓氏，就像在java中一样

Question

无法使用分割功能，请帮忙...

假设输入 = SACHIN RAMESH TENDULKAR 全部大写。

输出=Tendulkar.S.R

我尝试的代码是使用字符串数组还有其他选择吗？-

import java.util.*;
public class substr {

public static void main(String[] args) {
    // TODO Auto-generated method stub

            Scanner s = new Scanner(System.in);
            String[] array = new String[3];
            System.out.println("Please enter first name,middle name and 
           last name in capital");

            for (int i = 0; i < array.length;i++){
                array[i] = s.nextLine();
            }
            char f=array[0].charAt(0);
            char m=array[1].charAt(0);
            char sn=array[2].charAt(0);
            String sn1="";
            for(int i=1;i<array[2].length();i++){
                char ch=array[2].charAt(i);
                if(ch>=65 && ch<90){
                    ch=(char)(ch+32);
                    }   
                    sn1+=ch;

                }
            System.out.println(sn+sn1+"."+f+"."+m); 
        }

}

Answer 1

你可以这样做:

import java.util.Scanner;
public class Substr {

public static void main(String[] args) {
       Scanner input = new Scanner(System.in);
       System.out.println("Please enter First Name, Middle Name and Last Name");
       String fullName = input.nextLine().toUpperCase(); // convert input to UPPERCASE
       while(fullName.charAt(fullName.length()-1)==' '){ // remove all spaces at the end of the input because it may cause problem
            fullName = fullName.substring(0, fullName.length()-1);
       }
       while(fullName.charAt(0)==' '){ // remove all spaces at the beginning of the input because it may cause problem
           fullName = fullName.substring(1, fullName.length());
       }

       String firstName = "", middleName ="", lastName ="";

       firstName = fullName.substring(0, fullName.indexOf(' ')); // the first name is from the beginning to the first occurrence of space 

       int noOfSpaces=0;
       for(int i=firstName.length(); i<fullName.length(); i++){// count the number of spaces after the first name in case user by mistake
                                                                                    // entered more than one space
            if (fullName.charAt(i)==' '){
                noOfSpaces++;
            }
            else{
                break;
            }
       }
       middleName = fullName.substring(firstName.length()+noOfSpaces, fullName.lastIndexOf(' ')); // the second name (remember we removed the spaces at the end)

       lastName = fullName.substring(fullName.lastIndexOf(' ')+1,fullName.length()); // the last name

        String customizedName = firstName + "." + middleName.charAt(0) + "." + lastName.charAt(0);
        System.out.println(customizedName); 
}

示例(请注意名字前后、名字后面和姓氏后面的故意空格 -> 不会破坏输出):

Please enter First Name, Middle Name and Last Name
    Muhammad    Yahya   Almardeny
MUHAMMAD.Y.A

另一个例子(正常):

Please enter First Name, Middle Name and Last Name
Muhammad Yahya Almardeny
MUHAMMAD.Y.A