初学java
编写一个ReadNumber 类/////////////源程序//////////////
package user;
import java.io.*;
public class ReadNumber{
private static String str;
private static boolean error;
public static int readInteger(){
BufferedReader in=new BufferedReader( new InputStreamReader(System.in));
error=false;
do{ System.out.flush();
try { str=in.readLine();
} catch(IOException e){
System.out.println(e);
System.exit(1);
}
if(str.length()==0)error=true;
else try { return Integer.valueOf(str).intValue();
} catch(NumberFormatException e){
System.out.println(e);
System.out.print("Please re-input a integer:");
error=true;
}
}while(error);
return Integer.valueOf(str).intValue();
}
public static float readFloat(){
BufferedReader in=new BufferedReader( new InputStreamReader(System.in));
error=false;
do{ System.out.flush();
try{ str=in.readLine();
} catch(IOException e){
System.out.println(e);
System.exit(1);
}
if(str.length()==0) error=true;
else try{ return Float.valueOf (str).floatValue();
} catch(NumberFormatException e){
System.out.println(e);
System.out.print("Please re-input a float:");
error=true;
}
}while(error);
return Float.valueOf(str).floatValue();
}
}
/////////////////////////////////测试未通过,提示信息:“Can not access ReadNumber”
///////////////测试类源程序//////////////
import user.*;
class Test {
public static void main(String[] args){
int i ;
float j;
i=ReadNumber.readInteger() ;
j=ReadNumber.readFloat() ;
System.out.println(i);
System.out.println(j);
}
}
/////////////////////////////////////////
编写一个ReadNumber 类/////////////源程序//////////////
package user;
import java.io.*;
public class ReadNumber{
private static String str;
private static boolean error;
public static int readInteger(){
BufferedReader in=new BufferedReader( new InputStreamReader(System.in));
error=false;
do{ System.out.flush();
try { str=in.readLine();
} catch(IOException e){
System.out.println(e);
System.exit(1);
}
if(str.length()==0)error=true;
else try { return Integer.valueOf(str).intValue();
} catch(NumberFormatException e){
System.out.println(e);
System.out.print("Please re-input a integer:");
error=true;
}
}while(error);
return Integer.valueOf(str).intValue();
}
public static float readFloat(){
BufferedReader in=new BufferedReader( new InputStreamReader(System.in));
error=false;
do{ System.out.flush();
try{ str=in.readLine();
} catch(IOException e){
System.out.println(e);
System.exit(1);
}
if(str.length()==0) error=true;
else try{ return Float.valueOf (str).floatValue();
} catch(NumberFormatException e){
System.out.println(e);
System.out.print("Please re-input a float:");
error=true;
}
}while(error);
return Float.valueOf(str).floatValue();
}
}
/////////////////////////////////测试未通过,提示信息:“Can not access ReadNumber”
///////////////测试类源程序//////////////
import user.*;
class Test {
public static void main(String[] args){
int i ;
float j;
i=ReadNumber.readInteger() ;
j=ReadNumber.readFloat() ;
System.out.println(i);
System.out.println(j);
}
}
/////////////////////////////////////////
测试未通过,提示信息:“Can not access ReadNumber” 是你不能访问那个类
估计是环境变量的问题或者是引用 打包的问题
package user;//这样试下,或者main函数直接放ReadNumber类里面去
class Test {
public static void main(String[] args){
int i ;
float j;
i=ReadNumber.readInteger() ;
j=ReadNumber.readFloat() ;
System.out.println(i);
System.out.println(j);
}
}
cannot resolve symbol method readInteger()
cannot resolve symbol method readFloat()
我用的编译环境是Jcreator
输入1 2
输出1 2。0 刚刚试的
你是不是
或者
import user.ReadNumber;
class Test {
public static void main(String[] args){
int i ;
float j;
i=ReadNumber.readInteger() ;
j=ReadNumber.readFloat() ;
System.out.println(i);
System.out.println(j);
}
}