对于家庭作业,我想要求用户一次输入他的名字 1 个字符。我使用 for 循环不断要求他输入下一个字符。最后,我想显示整个名称,而不仅仅是给出的最后一个字母。我知道随着循环的进行,它会继续打印出最后一个字母,因为lastName=lastName.substring(0,1);
如何保存输入的最后一个字母并用它构建一个字符串?那是我的问题
import java.util.Arrays;
import java.util.Scanner;
import javax.swing.JOptionPane;
public class onecharacter {
public static void main(String[] args) {
for(int x=1; x>-1; x++){
Scanner userInput = new Scanner( System.in );
String lastName;
if (x==1){
System.out.println ("Please enter your last name, one character at a time.");
}
else
{System.out.println ("Next letter");}
lastName= userInput.nextLine();
//System.out.println (lastName.substring(0,1));
lastName=lastName.substring(0,1);// only reading first character in string.
//In case someone puts more than 1 character in.
int answer=
JOptionPane.showConfirmDialog(null, "Are you finished?", "Click Yes or No:", JOptionPane.YES_NO_OPTION);
if (answer== JOptionPane.YES_OPTION)
{System.out.println ("You entered " +lastName);
System.exit(0);}
else if (answer== JOptionPane.NO_OPTION);
else
System.out.println ("This is Impossible");
}
}