Java穦σ把σ戈
class :
public class class_name
{
}
   
mainㄧ计秨繷:
public static void main(String args[])throws IOException
{
    BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
    String str;
    str=br.readLine();
}


摸畐:
import java.io.*;
import java.util.*;


ㄧ计: 
System.out.println
System.out.print


switch
return
continue
break



﹃ㄧ计: 
char charAt(int index)			boolean equals(String str)
int Integer.parseInt(String str)	int length() 	
String toLowerCase()			String toUpperCase()
double Double.parseDouble(String str)	String IndexOf(String str)
String toCharArray()			char Character.digit(char ch,int base)
String substring(int index)		String substring(int begin, int end)
static String toString(char c)		static String toString(int i)

睹计ㄧ计:
Random method :
int nextInt(int n)



ASCII 絏 :
龄(秈)  :   0 (48),   1 (49),  2 (50),  ........... 9(57)

龄(秈)  :   A (65),   B (66),  C (67),  ........... Z(90)

龄(秈)  :   a (97),   b (98),  c (99),  ........... z(122)