???????????java?????????java??????????????????????????????????????????????????????????OJ????Щ??????????
????1. ????
??????????Scanner cin = new Scanner (new BufferedInputStream(System.in));
?????????

 

import java.io.*;
import java.math.*;
import java.util.*;
import java.text.*;
public class Main
{
public static void main(String[] args)
{
Scanner cin = new Scanner (new BufferedInputStream(System.in));
int a; double b; BigInteger c; String st;
a = cin.nextInt(); b = cin.nextDouble(); c = cin.nextBigInteger(); d = cin.nextLine(); // ?????????????????????.
}
}

 

????2. ???
??????????System.out.print(); System.out.println(); System.out.printf();
????System.out.print(); // cout << …;
????System.out.println(); // cout << … << endl;
????System.out.printf(); // ??C?е?printf?÷?????.
?????????

 

import java.io.*;
import java.math.*;
import java.util.*;
import java.text.*;
public class Main
{
public static void main(String[] args)
{
Scanner cin = new Scanner (new BufferedInputStream(System.in));
int a; double b;
a = 12345; b = 1.234567;
System.out.println(a + " " + b);
System.out.printf("%d %10.5f/n"?? a?? b); // ????b?????10???????????С?????5λ??????????.
}
}

 

??????????????
??????????
????// ????0??λ?????#???0?????????(?????0???????)??????????.
????DecimalFormat fd = new DecimalFormat("#.00#");
????DecimalFormat gd = new DecimalFormat("0.000");
????System.out.println("x =" + fd.format(x));
????System.out.println("x =" + gd.format(x));