控制台输入
1、Scanner实现
import java.util.Scanner;
/**A simple text scanner which can parse primitive types and strings using
* regular expressions.
*/
Scanner sca = new Scanner(System.in); //以System.in为输入流创建Scanner
//获取控制台输入的字符串（回车后sca会获取控制台输入的值）
String input=sca.next(); //封装了18种next***方法，可更加实际情况灵活应用
.... //业务处理
2、BufferedReader实现
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
//以System.in为输入流创建BufferedReader
BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
String str = null;
try {
//获取控制台输入的字符串（回车后br会获取控制台输入的整行字符串值）
//必须捕获IO异常
str = br.readLine();
} catch (IOException e) {
e.printStackTrace();
}
.... //业务处理
控制台输出
//输出制定数据后自动换行
System.out.printlin();
详细解释：
/**
* Terminates the current line by writing the line separator string.
*/
public void println();
/**
* Prints a boolean and then terminate the line.
*/
public void println(boolean x);
/**
* Prints a character and then terminate the line.
*/
public void println(char x);
/**
* Prints an integer and then terminate the line.
*/
public void println(int x);
/**
* Prints a long and then terminate the line.
*/
public void println(long x);
/**
* Prints a float and then terminate the line.
*/
public void println(float x);
/**
* Prints a double and then terminate the line.
*/
public void println(double x);
/**
* Prints an array of characters and then terminate the line.
*/
public void println(char x[]);
/**
* Prints a String and then terminate the line
*/
public void println(String x);
/**
* Prints an Object and then terminate the line.
*/
public void println(Object x);
//输出制定数据后不换行
System.out.print(String x); //同println，但无无参数（只是换行）的重载
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