如何只显示字符串的第一个字母？ [英] How do I show only the first letters of a string?

问题描述

我提示用户输入他们的名字和姓氏，但我无法弄清楚如何只显示他们的第一个和最后一个首字母

I'm prompting the user to enter their first and last name but I can't figure out how to show just their first and last initials

import javax.swing.*;
//import java.awt.*;

public class Lab2Program2 {

    public static void main (String [] args) {

    String firstName;
    String lastName;


    firstName = JOptionPane.showInputDialog(null, "What is your first name?");
    lastName = JOptionPane.showInputDialog(null, "What is your last name?");

    JOptionPane.showMessageDialog(null, " Your initials are " + 
                            firstName + " " + lastName);
    }
}

推荐答案

你可以使用 chatAt（）方法。

JOptionPane.showMessageDialog(null, 
            "Your initials are " + firstName.charAt(0) + " " + lastName.charAt(0));

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