使用语句来比较字符串

Question

我正在尝试评估用户输入，但是while语句似乎在不要求输入的情况下进入了无限循环。

import javax.swing.JOptionPane;
public class StringMethodsTwo {
    public static void main(String[] args)
    {
        String sFullName = " ";
        String prompt = "Please enter your full name:";
        while(sFullName.startsWith(" "));
        {
            sFullName = getInput(prompt);
            if(sFullName.length() < 2)
            {
                prompt = "Please enter your full name, "<first> <middle> <last>":";
            }
        }
    }
    public static String getInput(String prompt)
    {
        return JOptionPane.showInputDialog(null, prompt);
    }
}

Answer 1

你正在做循环

while(sFullName.startsWith(" ")); // while(true);
{

删除";"

Answer 2

去掉"while"行末尾的分号。