我正在制作一个程序,为输入的名字提供随机抽奖号码。但问题是我必须确保用户同时输入名字和姓氏。我正在使用一种方法在用户输入中找到空格,然后从该数据创建子串,但我继续在我的for循环下获得错误“不兼容类型”。任何帮助将不胜感激!
enter code here
import java.util.Scanner; //Import scanner class
import java.util.Random; //Import random number generator
import java.io.*; //Import PrintWriter
public class Lab4ZinkovskyFl //Program that lets user enter a name and generates random lottery numbers for that name
{
public static void main (String[] args) throws IOException
{
Scanner keyboard = new Scanner (System.in);
Random randomNumbers = new Random();
String again = "y"; //Control the loop
int r1 = randomNumbers.nextInt(100)+ 1; //*******************
int r2 = randomNumbers.nextInt(100)+ 1; //* Random lottery
int r3 = randomNumbers.nextInt(100)+ 1; //* numbers for
int r4 = randomNumbers.nextInt(100)+ 1; //* program
int r5 = randomNumbers.nextInt(100)+ 1; //*******************
while (again.equalsIgnoreCase ("y")) // Allows the user to continue the loop
{
System.out.println ("Please enter first and last name to enter the lottery.");
String fullName = keyboard.nextLine();
boolean space = false; // Checks for first and last name
for (int i = 0; i < fullName.length(); i++)
{
if (fullName.indexOf(i) == " ")
{
space = true;
spaceIndex = i;
}
else
{
System.out.println ("Error, please enter both first and last name to continue.");
}
}
String firstName = fullName.substring (0, spaceIndex);
String lastName = fullName.substring (spaceIndex, fullName.length());
System.out.println (lastName + ", " + firstName + ": " + r1 + ", " + r2 + ", " + r3 + ", " + r4 + ", " + r5);
System.out.println ("Run the lottery again? (y=yes)");
again = keyboard.nextLine();
}
}
}
答案 0 :(得分:2)
您可以将用户输入拆分为“”,如下所示:
String[] names = fullName.split(" ");
然后,如果用户输入全名,则创建一个返回true的方法。
for (int i = 0 ; i < names.length ; i++) {
if (names[i].trim().equals("")) {
names[i] = null;
}
}
int elementsWithText = 0;
for (int i = 0 ; i < names.length ; i++) {
if (names[i] != null) {
elementsWithText++;
}
}
return elementsWithText == 2;
这样的事情。希望你能算出我在做什么。如果您不知道方法调用正在做什么,它们都来自String
。这是文档:
http://docs.oracle.com/javase/7/docs/api/java/lang/String.html
答案 1 :(得分:0)
indexOf()接受一个char作为输入(在你的情况下)。将我改为&#34; &#34;(空格)
答案 2 :(得分:0)
你需要这样写
if (fullName.indexOf(" ") == -1)
{
System.out.println ("Error, please enter both first and last name to continue.");
}
else
{
space = true;
spaceIndex = i;
}
但为什么选择循环?
@sweeper提供了最佳解决方案。