重新排列字符串

Question

所以我的目标是重新排列输入到程序中的字符串，以便输出相同的信息，但顺序不同。输入顺序是firstNamemiddleName，lastName，emailAddress和期望的输出是lastName，firstNamefirst letter of middleName.

例如输入

JohnJack，Brown，JJB@yahoo.com

将输出

Brown， JohnJ.

这里是我到目前为止

import java.util.Scanner; 

public class NameRearranged { 
    public static void main(String[] args) { 
    Scanner keyboard = new Scanner(System.in); 
    System.out.print("Enter a name like D2L shows them: "); 
    String entireLine = keyboard.nextLine(); 
    String[] fml = entireLine.split(","); 
    String newName = fml[0].substring(7); 
    String newLine = fml[1] + "," + newName + "."; 
    System.out.println(newLine); 
    } 

    public String substring(int endIndex) { 
    return null;  
    } 
} 

我无法弄清楚如何分开firstName和middleName，所以我可以substring()的middleName的第一个字母后跟一个.

Answer 1

这符合您的要求输出。

import java.util.Scanner; 

public class NameRearranged { 

    public static void main(String[] args) { 
     Scanner keyboard = new Scanner(System.in); 
     System.out.print("Enter a name like D2L shows them: "); 
     String entireLine = keyboard.nextLine(); 

     String[] fml = entireLine.split(","); //seperate the string by commas 

     String[] newName = fml[0].split(" "); //seperates the first element into 
               //a new array by spaces to hold first and middle name 

     //this will display the last name (fml[1]) then the first element in 
     //newName array and finally the first char of the second element in 
     //newName array to get your desired results. 
     String newLine = fml[1] + ", " + newName[0] + " "+newName[1].charAt(0)+"."; 

     System.out.println(newLine); 


    } 

} 

Answer 2

选中此项。

public class NameRearranged { 
    public static void main(String[] args) { 
     Scanner keyboard = new Scanner(System.in); 
     System.out.print("Enter a name like D2L shows them: "); 
     System.out.println(rearrangeName(keyboard.nextLine())); 
    } 

    public static String rearrangeName(String inputName) { 
     String[] fml = inputName.split(" |,"); // Separate by space and , 
     return fml[2] + ", " + fml[0] + " " + fml[1].charAt(0) + "."; 
    } 
} 

Answer 3

您还需要为空格分隔字符串。并且不要忘记替代的“|”字符。尝试以下操作。

String[] fml = entireLine.split(" |, ");