学一下输入输出

输入：
导入一个
import java.untils.Scanner;

慢的输入是：

Scanner sc = new Scanner(System.in);
int a = next.Int();

快的输入：

import java.io.BufferedReader;
import java.io.InputStreamReader;

public class Main()
{
pubcli static void main(String[] args)
{
BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
String br = br.readLine();
System.out.println(str);
}
}

输出:
System.out.printf(“%d/n”,&x)

快一点的输出：

import java.io.BufferWriter;
import java.io.OutputStreamWriter;

public class Main()
{
public static void main(String[] args)
{
BufferedWriter bw=new BufferWriter(new OutputStreamWriter(System.out));
bw.writer(“hello world”);
bw.flush();//手动刷新缓冲区
}
}