下面的这个程序经过测试,问题解决!
import java.io.*;
/**
*A simple input class to read values typed at the command line.if an error
*occurs during input,any exceptiong thrown are caught and a default value
*returned.
*
*@version 1.1 1999.08.18
*@author Graham Roberts
*@author Russel Winder
*/
public class KeyboardInput
{ /**
*the buffered stream that works the keyboard so that we can read
*from it sensibly.
*/
private final BufferedReader in =
new BufferedReader(new InputStreamReader (System.in));
/**
*Read an <CODE>int</CODE> value from keyboard input.
*the default return value is 0.
*/
public final synchronized int readInteger()
{
String input="";
int value=0;
try
{
input=in.readLine();
}
catch (IOException e)
{
if (input !=null)
{
try
{
value =Integer.parseInt(input);
}
catch (NumberFormatException ee){}
}
}
return value;
}
/**
*read a <CODE>long</CODE> value from keyboard input.
*the default return value is 0L.
*/
public final synchronized long readLong()//´íÎóµÄ¾ÍÊÇÕâÐÐ
//illeagl start expression public final synchronized long readLong()
{
String input="";
long value =0L;
try
{
input=in.readLine();
}
catch (IOException e){}
if (input !=null)
{
try
{
value=Long.parseLong(input);
}
catch (NumberFormatException ee){}
}
return value;
}
/**
*Read a<CODE>double</CODE> value from keyborad input.
*the default return value is 0.0.
*/
public final synchronized double readDouble()
{
String input="";
double value=0.0D;
try{
input=in.readLine();
}
catch (IOException e){}
if (input !=null){
try{
value =Double.parseDouble(input);
}
catch (NumberFormatException ee){}
}
return value;
}
//float,default return value is 0.0F
public final synchronized float readFloat(){
String input="";
float value=0.0F;
try{
input=in.readLine();
}
catch (IOException e){}
if(input !=null){
try{
value=Float.parseFloat(input);
}
catch (NumberFormatException ee){}
}
return value;
}
//char,default return value is ' '(space).
public final synchronized char readCharacter(){
char c=' ';
try{
c=(char)in.read();
}
catch (IOException e){}
return c;
}
//String,default return value is ""(the empty string).
public final synchronized String readString()
{
String s="";
try
{
s=in.readLine();
}
catch (IOException e)
{
}
if(s==null)
{
s="";
}
return s;
}
}
import java.io.*;
/**
*A simple input class to read values typed at the command line.if an error
*occurs during input,any exceptiong thrown are caught and a default value
*returned.
*
*@version 1.1 1999.08.18
*@author Graham Roberts
*@author Russel Winder
*/
public class KeyboardInput
{ /**
*the buffered stream that works the keyboard so that we can read
*from it sensibly.
*/
private final BufferedReader in =
new BufferedReader(new InputStreamReader (System.in));
/**
*Read an <CODE>int</CODE> value from keyboard input.
*the default return value is 0.
*/
public final synchronized int readInteger()
{
String input="";
int value=0;
try
{
input=in.readLine();
}
catch (IOException e)
{
if (input !=null)
{
try
{
value =Integer.parseInt(input);
}
catch (NumberFormatException ee){}
}
}
return value;
}
/**
*read a <CODE>long</CODE> value from keyboard input.
*the default return value is 0L.
*/
public final synchronized long readLong()//´íÎóµÄ¾ÍÊÇÕâÐÐ
//illeagl start expression public final synchronized long readLong()
{
String input="";
long value =0L;
try
{
input=in.readLine();
}
catch (IOException e){}
if (input !=null)
{
try
{
value=Long.parseLong(input);
}
catch (NumberFormatException ee){}
}
return value;
}
/**
*Read a<CODE>double</CODE> value from keyborad input.
*the default return value is 0.0.
*/
public final synchronized double readDouble()
{
String input="";
double value=0.0D;
try{
input=in.readLine();
}
catch (IOException e){}
if (input !=null){
try{
value =Double.parseDouble(input);
}
catch (NumberFormatException ee){}
}
return value;
}
//float,default return value is 0.0F
public final synchronized float readFloat(){
String input="";
float value=0.0F;
try{
input=in.readLine();
}
catch (IOException e){}
if(input !=null){
try{
value=Float.parseFloat(input);
}
catch (NumberFormatException ee){}
}
return value;
}
//char,default return value is ' '(space).
public final synchronized char readCharacter(){
char c=' ';
try{
c=(char)in.read();
}
catch (IOException e){}
return c;
}
//String,default return value is ""(the empty string).
public final synchronized String readString()
{
String s="";
try
{
s=in.readLine();
}
catch (IOException e)
{
}
if(s==null)
{
s="";
}
return s;
}
}
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