Java输入输出挂参考

输入输出挂1（P神）

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.StringTokenizer;
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.util.Arrays;

/**
 * Built using CHelper plug-in
 * Actual solution is at the top
 */
public class Main {
    public static void main(String[] args) {
        InputStream inputStream = System.in;
        OutputStream outputStream = System.out;
        InputReader in = new InputReader(inputStream);
        PrintWriter out = new PrintWriter(outputStream);
        
        out.close();//一定要滴
    }

    static class InputReader {
        public BufferedReader reader;
        public StringTokenizer tokenizer;

        public InputReader(InputStream stream) {
            reader = new BufferedReader(new InputStreamReader(stream), 32768);
            tokenizer = null;
        }

        public String next() {
            while (tokenizer == null || !tokenizer.hasMoreTokens()) {
                try {
                    tokenizer = new StringTokenizer(reader.readLine());
                } catch (IOException e) {
                    throw new RuntimeException(e);
                }
            }
            return tokenizer.nextToken();
        }
		String nextLine() throws IOException{
			return reader.readLine();
		}//自己加的
        public int nextInt() {
            return Integer.parseInt(next());
        }

    }
}

挂2

StreamTokenizer sc=new StreamTokenizer(new BufferedReader(new InputStreamReader(System.in)));
PrintWriter out=new PrintWriter(new OutputStreamWriter(System.out));

挂3（带hasNext()）

static FastScanner sc = new FastScanner(System.in);// 快读
static PrintWriter out = new PrintWriter(new BufferedWriter(new OutputStreamWriter(System.out)));// 快速输出


class FastScanner {// 用于快速读入大量数据
	BufferedReader br;
	StringTokenizer st;

	public FastScanner(InputStream in) {
		br = new BufferedReader(new InputStreamReader(in), 16384);
		eat("");
	}

	public void eat(String s) {
		st = new StringTokenizer(s);
	}

	public String nextLine() {
		try {
			return br.readLine();
		} catch (IOException e) {
			return null;
		}
	}

	public boolean hasNext() {
		while (!st.hasMoreTokens()) {
			String s = nextLine();
			if (s == null)
				return false;
			eat(s);
		}
		return true;
	}

	public String next() {
		hasNext();
		return st.nextToken();
	}

	public int nextInt() {
		return Integer.parseInt(next());
	}
}

挂4

import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.util.Arrays;
import java.util.InputMismatchException;

public class Main {

	private static final String NO = "NO";
	private static final String YES = "YES";
	InputStream is;
	PrintWriter out;
	String INPUT = "";

	private static final long MOD = 998244353L;

	void run() throws Exception {
		is = INPUT.isEmpty() ? System.in : new ByteArrayInputStream(INPUT.getBytes());
		out = new PrintWriter(System.out);

		long s = System.currentTimeMillis();
		solve();
		out.flush();
		if (!INPUT.isEmpty())
			tr(System.currentTimeMillis() - s + "ms");
	}

	public static void main(String[] args) throws Exception {
		new Main().run();
	}

	private byte[] inbuf = new byte[1024];
	public int lenbuf = 0, ptrbuf = 0;
	private boolean vis[];

	private int readByte() {
		if (lenbuf == -1)
			throw new InputMismatchException();
		if (ptrbuf >= lenbuf) {
			ptrbuf = 0;
			try {
				lenbuf = is.read(inbuf);
			} catch (IOException e) {
				throw new InputMismatchException();
			}
			if (lenbuf <= 0)
				return -1;
		}
		return inbuf[ptrbuf++];
	}

	private boolean isSpaceChar(int c) {
		return !(c >= 33 && c <= 126);
	}

	private int skip() {
		int b;
		while ((b = readByte()) != -1 && isSpaceChar(b))
			;
		return b;
	}

	private double nd() {
		return Double.parseDouble(ns());
	}

	private char nc() {
		return (char) skip();
	}

	private String ns() {
		int b = skip();
		StringBuilder sb = new StringBuilder();
		while (!(isSpaceChar(b))) { // when nextLine, (isSpaceChar(b) && b != '
									// ')
			sb.appendCodePoint(b);
			b = readByte();
		}
		return sb.toString();
	}

	private char[] ns(int n) {
		char[] buf = new char[n];
		int b = skip(), p = 0;
		while (p < n) {
			if (!(isSpaceChar(b)))
				buf[p++] = (char) b;
			b = readByte();
		}
		return n == p ? buf : Arrays.copyOf(buf, p);
	}

	private char[][] nm(int n, int m) {
		char[][] map = new char[n][];
		for (int i = 0; i < n; i++)
			map[i] = ns(m);
		return map;
	}

	private int[] na(int n) {
		int[] a = new int[n];
		for (int i = 0; i < n; i++)
			a[i] = ni();
		return a;
	}

	private Integer[] na2(int n) {
		Integer[] a = new Integer[n];
		for (int i = 0; i < n; i++)
			a[i] = ni();
		return a;
	}

	private int[][] na(int n, int m) {
		int[][] a = new int[n][];
		for (int i = 0; i < n; i++)
			a[i] = na(m);
		return a;
	}

	private Integer[][] na2(int n, int m) {
		Integer[][] a = new Integer[n][];
		for (int i = 0; i < n; i++)
			a[i] = na2(m);
		return a;
	}

	private int ni() {
		int num = 0, b;
		boolean minus = false;
		while ((b = readByte()) != -1 && !((b >= '0' && b <= '9') || b == '-'))
			;
		if (b == '-') {
			minus = true;
			b = readByte();
		}

		while (true) {
			if (b >= '0' && b <= '9') {
				num = num * 10 + (b - '0');
			} else {
				return minus ? -num : num;
			}
			b = readByte();
		}
	}

	private long nl() {
		long num = 0;
		int b;
		boolean minus = false;
		while ((b = readByte()) != -1 && !((b >= '0' && b <= '9') || b == '-'))
			;
		if (b == '-') {
			minus = true;
			b = readByte();
		}

		while (true) {
			if (b >= '0' && b <= '9') {
				num = num * 10 + (b - '0');
			} else {
				return minus ? -num : num;
			}
			b = readByte();
		}
	}

	private static void tr(Object... o) {
		System.out.println(Arrays.deepToString(o));
	}
}

挂五

import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.util.InputMismatchException;

public class Main {
	
	public static void main(String[] args) throws IOException {
		
		InputReader in=new InputReader(System.in);
		PrintWriter out=new PrintWriter(System.out);
		
		int ans=0;
		out.println(ans);
		out.close();
	}
	static class InputReader{
		private final InputStream stream;
		private final byte[] buf=new byte[8192];
		private int curChar,snumChars;
		
		public InputReader(InputStream stream) {
			this.stream=stream;
		}
		public int read() {
			if(snumChars==-1) throw new InputMismatchException();
			if(curChar>=snumChars) {
				curChar=0;
				try {
					snumChars=stream.read(buf);
				}catch(IOException e) {
					throw new InputMismatchException();
				}
				if(snumChars<=0) return -1;
			}
			return buf[curChar++];
		}
		public int ni() {
			int c=read();
			while(isSpaceChar(c)) {
				c=read();
			}
			int sgn=1;
			if(c=='-') {
				sgn=-1;
				c=read();
			}
			int res=0;
			do {
				res*=10;
				res+=c-'0';
				c=read();
			}while(!isSpaceChar(c));
			return res*sgn;
		}
		public long nl() {
			int c=read();
			while(isSpaceChar(c)) {
				c=read();
			}
			int sgn=1;
			if(c=='-') {
				sgn=-1;
				c=read();
			}
			long res=0;
			do {
				res*=10;
				res+=c-'0';
				c=read();
			}while(!isSpaceChar(c));
			return res*sgn;
		}
		public int []nextIntArray(int n){
			int a[]=new int [n];
			for(int i=0;i<n;i++) {
				a[i]=ni();
			}
			return a;
		}
		public String readString() {
			int c=read();
			while(isSpaceChar(c)) c=read();
			StringBuilder res=new StringBuilder();
			do {
				res.appendCodePoint(c);
				c=read();
			}while(!isSpaceChar(c));
			return res.toString();
		}
		public String nextLine() {
			int c=read();
			while(isSpaceChar(c)) c=read();
			StringBuilder res=new StringBuilder();
			do {
				res.appendCodePoint(c);
				c=read();
			}while(!isEndOfLine(c));
			return res.toString();
		}
		public boolean isSpaceChar(int c) {
			return c==' '||c=='\n'||c=='\r'||c=='\t'||c==-1;
		}
		private boolean isEndOfLine(int c) {
			return c=='\n'||c=='\r'||c==-1;
		}
	}
}