Java 扫描仪不读取整个句子 - 扫描仪类的 next() 和 nextLine() 之间的区别
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Scanner doesn't read whole sentence - difference between next() and nextLine() of scanner class
提问by Bonett09
I'm writing a program which allows the user to input his data then outputs it. Its 3/4 correct but when it arrives at outputting the address it only prints a word lets say only 'Archbishop' from 'Archbishop Street'. How do I fix this?
我正在编写一个程序，允许用户输入他的数据然后输出它。它的 3/4 正确，但是当它到达输出地址时，它只打印一个单词，让我们只说“大主教街”中的“大主教”。我该如何解决？
import java.util.*;
class MyStudentDetails{
public static void main (String args[]){
Scanner s = new Scanner(System.in);
System.out.println("Enter Your Name: ");
String name = s.next();
System.out.println("Enter Your Age: ");
int age = s.nextInt();
System.out.println("Enter Your E-mail: ");
String email = s.next();
System.out.println("Enter Your Address: ");
String address = s.next();
System.out.println("Name: "+name);
System.out.println("Age: "+age);
System.out.println("E-mail: "+email);
System.out.println("Address: "+address);
}
}
回答by Raghuram
回答by Michael Borgwardt
Instead of using System.inand System.outdirectly, use the Consoleclass - it allows you to display a prompt and read an entire line (thereby fixing your problem) of input in one call:
不是直接使用System.inand System.out，而是使用Console该类 - 它允许您在一次调用中显示提示并读取整行输入（从而解决您的问题）：
String address = System.console().readLine("Enter your Address: ");
回答by Anthony Forloney
I would use Scanner#nextLineopposed to nextfor your addressattribute.
我会用Scanner#nextLine反对next你的address属性。
This method returns the rest of the current line, excluding any line separator at the end.
此方法返回当前行的其余部分，不包括末尾的任何行分隔符。
Since this returns the entire line, delimited by a line separator, it will allow the user to enter any address without any constraint.
由于这将返回由行分隔符分隔的整行，因此它将允许用户无限制地输入任何地址。
回答by user114573
You can do this:
你可以这样做：
class MyStudentDetails{
public static void main (String args[]){
Scanner s = new Scanner(System.in);
System.out.println("Enter Your Name: ");
String name = s.nextLine();
System.out.println("Enter Your Age: ");
String age = s.nextLine();
System.out.println("Enter Your E-mail: ");
String email = s.nextLine();
System.out.println("Enter Your Address: ");
String address = s.nextLine();
System.out.println("Name: "+name);
System.out.println("Age: "+age);
System.out.println("E-mail: "+email);
System.out.println("Address: "+address);
}
}
回答by Nomad
回答by Eugene Prokopenko
I had the same question. This should work for you:
我有同样的问题。这应该适合你：
s.nextLine();
回答by Arvind Ramachandran
This approach is working, but I don't how, can anyone explain, how does it works..
这种方法有效，但我不知道它是如何工作的，谁能解释一下。
String s = sc.next();
s += sc.nextLine();
回答by Akshay Suresh
Use nextLine()instead of next()for taking sentence as string input.
使用nextLine()，而不是next()采取一句字符串输入。
Scanner sc = new Scanner(System.in);
String s = sc.nextLine();
回答by Bharathi Mohan
To get the whole adress add
要获取整个地址添加
s.nextLine();//read the rest of the line as input
before
前
System.out.println("Enter Your Address: ");
String address = s.next();
回答by Vinayak
String s="Hi";
String s1="";
//For Reading Line by hasNext() of scanner
while(scan.hasNext()){
s1 = scan.nextLine();
}
System.out.println(s+s1);
/*This Worked Fine for me for reading Entire Line using Scanner*/
