Java 算竞操作
本文最后更新于 244 天前,其中的信息可能已经有所发展或是发生改变。

输入输出


简单写法


数据量不大:

Scanner sc = new Scanner(System.in);
int a = sc.nextInt();
char op = sc.nextLine().charAt(0);

如果比较大可以换:

Scanner sc = new Scanner(new BufferedInputStream(System.in))

不嫌麻烦可以写:

public class Main {
static BufferedReader cin = new BufferedReader(new InputStreamReader(System.in));
static PrintWriter cout = new PrintWriter(new OutputStreamWriter(System.out));
public static void main(String[] args) throws IOException {
int a = Integer.parseInt(cin.readLine());
cout.println(a);
// cin.close();
cout.flush();
cout.println(a);
cout.flush();
}
}

快读板子


import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.util.StringTokenizer;
public class Main {
static Cin cin = new Cin();
static PrintWriter cout = new PrintWriter(System.out);
static void solve() {
int n = cin.nextInt();
for (int i = 0; i < n; i ++) {
char op = cin.nextChar();
cout.println(op);
}
}
public static void main(String[] args) {
int t = 1;
// t = cin.nextInt();
for (int i = 0; i < t; i ++) {
solve();
}
cout.flush();
}
static class Cin {
static BufferedReader br;
static StringTokenizer st;
Cin() {
br = new BufferedReader(new InputStreamReader(System.in));
}
String next() {
String s = "";
while (st == null || !st.hasMoreElements()) {
try {
s = br.readLine();
} catch (IOException e) {
throw new RuntimeException(e);
}
st = new StringTokenizer(s);
}
return st.nextToken();
}
int nextInt() {
return Integer.parseInt(next());
}
double nextDouble() {
return Double.parseDouble(next());
}
long nextLong() {
return Long.parseLong(next());
}
char nextChar() {
return next().charAt(0);
}
}
}

多实例输入


public class Main {
static Scanner sc = new Scanner(new BufferedInputStream(System.in));
public static void main(String[] args) {
while (sc.hasNext()) {
int a = sc.nextInt();
System.out.println(a);
}
}
}

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Source: github.com/k4yt3x/flowerhd
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