Java 如何创建是/否?
因此,这段代码允许用户保存在main中创建的对象。然而,我希望创建一个函数(我认为是if语句),它将询问用户是否希望保存它(results.txt)。如果有,则保存;如果没有,则退出程序Java 如何创建是/否?,java,class,if-statement,input,Java,Class,If Statement,Input,因此,这段代码允许用户保存在main中创建的对象。然而,我希望创建一个函数(我认为是if语句),它将询问用户是否希望保存它(results.txt)。如果有,则保存;如果没有,则退出程序 import java.io.FileOutputStream; import java.io.FileInputStream; import java.io.FileNotFoundException; public class Main { public s
import java.io.FileOutputStream;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
public class Main {
public static void main( String args[] ) {
Person arthur = new Person();
arthur.name = "Arthur Dent";
arthur.age= 21;
System.out.println("\nDo you wish to save these results? (Y / N)");
String fileName = "results.txt";
try {
ObjectOutputStream os = new ObjectOutputStream(new FileOutputStream(fileName));
os.writeObject(arthur); //write object
os.close();
} catch (IOException e) {
e.printStackTrace();
}
System.out.println("\nYour results are saved!");
}
}
遵循这个方法。扫描仪工作原理示例(适用于您的问题):
如果您使用上述代码,您将很快能够将其集成到您的问题中。您想知道如何提示用户或创建
If
语句吗?请在此处发布代码之前正确设置代码格式。您可以使用这个在线工具来实现这一点:查看Scanner类newscanner(System.in)代码>类似并且可能有帮助您也可以使用System.console()。再见,非常感谢。你能为这门课评论几句话吗,这样我就能更好地理解了。再次感谢。你说的//你在这里保存了什么意思?我在那里放了什么?我已经为你添加了一些评论。
public class Test2 {
static Boolean bool=true;
public static void main(String[] args){
System.out.println("Type Y or N:");
//Initialise the scanner object for the first time
//Save what the user inputs as s
Scanner sc = new Scanner(System.in);
String s=sc.next();
//Now you enter a while loop
//You will quit this loop if a condition is met
//If you want to you can set the bool to false and the while loop will end
while (bool){
//if what the user entered is not equal to Y or N
//then prompt him to try again
if (!s.equals("Y") && !s.equals("N")){
System.out.println("Please type only Y or N:");
sc = new Scanner(System.in);
s=sc.next();
}
//if the user actually entered Y
if (s.equals("Y")){
//Do your code logic here
//In your case that is saving your object
//Then you can exit the program if that's what you want
System.exit(1);
}
if (s.equals("N")){
//Add code logic if the user enters N if you need to
//Exit the program if that's what you want
System.exit(1);
}
}
}
}