英文:
Character and String input in Java
问题
以下是翻译好的代码部分：
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.util.StringTokenizer;
public class Main {
static class FastReader {
BufferedReader br;
StringTokenizer st;
public FastReader() {
br = new BufferedReader(new InputStreamReader(System.in));
}
String next() {
while (st == null || !st.hasMoreElements()) {
try {
st = new StringTokenizer(br.readLine());
}
catch (IOException e) {
e.printStackTrace();
}
}
return st.nextToken();
}
int nextInt() {
return Integer.parseInt(next());
}
long nextLong() {
return Long.parseLong(next());
}
double nextDouble() {
return Double.parseDouble(next());
}
char nextChar() {
char c = ' ';
try {
c = (char)br.read();
}
catch (IOException e) {
e.printStackTrace();
}
return c;
}
String nextLine() {
String str = "";
try {
str = br.readLine();
}
catch (IOException e) {
e.printStackTrace();
}
return str;
}
}
public static void main(String[] args) {
FastReader in = new FastReader();
PrintWriter out = new PrintWriter(System.out);
int n = in.nextInt();
char c = in.nextChar();
String s = in.nextLine();
out.println(n);
out.println(c);
out.println(s);
out.close();
}
}
英文:
I am new to Java and wrote a program for basic I/O operations of different data types. I want the program to input 1 a abcd and output them in in three different lines respectively. But when I input 1 a the program terminates and outputs 1 , a and an empty line in three different lines. I am not able to take a character input properly, which I think is the root of the problem.
Can someone please guide me as to where I got it wrong ?
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.util.Scanner;
import java.util.StringTokenizer;
public class Main {
static class FastReader {
BufferedReader br;
StringTokenizer st;
public FastReader() {
br = new BufferedReader(new InputStreamReader(System.in));
}
String next() {
while (st == null || !st.hasMoreElements()) {
try {
st = new StringTokenizer(br.readLine());
}
catch (IOException e) {
e.printStackTrace();
}
}
return st.nextToken();
}
int nextInt() {
return Integer.parseInt(next());
}
long nextLong() {
return Long.parseLong(next());
}
double nextDouble() {
return Double.parseDouble(next());
}
char nextChar() {
char c = ' ';
try {
c = (char)br.read();
}
catch (IOException e) {
e.printStackTrace();
}
return c;
}
String nextLine() {
String str = "";
try {
str = br.readLine();
}
catch (IOException e) {
e.printStackTrace();
}
return str;
}
}
public static void main(String[] args) {
FastReader in = new FastReader();
PrintWriter out = new PrintWriter(System.out);
int n = in.nextInt();
char c = in.nextChar();
String s = in.nextLine();
out.println(n);
out.println(c);
out.println(s);
out.close();
}
}
答案1
得分: 0
将代码重构如下。
char c = in.nextChar(); // 保持这一行不变
in.nextLine(); //（仅在上一行之后添加这一行）将这一行放在其他位置，否则无法插入字符串abcd
输出：
1
a
abcd
<details>
<summary>英文:</summary>
Refactor the code like below.
char c = in.nextChar();//Keep this line as same
in.nextLine();//(only add this line after the above line)Place this line otherwise your String abcd can't insert
output:
1
a
abcd
</details>
# 答案2
**得分**: 0
你的意思是像下面这样：
```plaintext
输入：1 a abcd
输出：
1
a
abcd
你引用了这段代码：
public static void main(String[] args) throws IOException {
BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(System.in));
String inputLine = bufferedReader.readLine();
if (inputLine != null && inputLine.length() > 0) {
String[] splitInputLine = inputLine.split(" ");
for (String outLine : splitInputLine) {
System.out.println(outLine);
}
}
bufferedReader.close();
}
英文:
you mean like follow:
input: 1 a abcd
out:
1
a
abcd
you reference this code:
public static void main(String[] args) throws IOException {
BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(System.in));
String inputLine = bufferedReader.readLine();
if (inputLine!=null && inputLine.length()>0) {
String[] splitInputLine = inputLine.split("\\ ");
for (String outLine : splitInputLine) {
System.out.println(outLine);
}
}
bufferedReader.close();
}
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