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，以便它以不同的顺序输出相同的信息。输入顺序为firstName middleName，lastName，emailAddress，预期输出为lastName，firstName first letter of middleName {{1 }}

例如输入

. John，Jack，Brown

会输出

JJB@yahoo.com，Brown John J

这是我到目前为止所拥有的

.

我无法弄清楚如何将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; } } 和firstName分开，以便我可以middleName substring()的第一个字母后跟middleName

Answer 1

这符合您的要求。

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

检查一下。

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。并且不要忘记候补＆＃34; |＆＃34;字符。请尝试以下方法。

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