JAVA题,将一个字符串的值转换成浮点型(double)数值

发布网友发布时间：2022-10-13 08:10

共2个回答

热心网友时间：2023-11-01 21:49

import java.io.*;
public class test{
    public static void main(String [] args) {
        try{
         BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
          String str = null;
          System.out.println("Enter your value:");
          str = br.readLine();
          System.out.println("your value is :"+str);
           int i=Integer.parseInt(str);
          System.out.println(i);
  }catch(Exception e){
   System.exit(0);
  }
}
}

热心网友时间：2023-11-01 21:49

import java.io.*;
class Test{

public static void main(String[] args){

String value=null;
double result=0;
try{

BufferedReader bis =new BufferedReader(new InputStreamReader(System.in));
while((value=bis.readLine())!=null){
DoubleConverter dc= new DoubleConverter();
if(!dc.testDouble(value)) {
System.out.println("输入不是浮点型");
System.exit(-1);
}
else {
result = dc.doConvert(value);
System.out.println("double value："+result);
}
}
bis.close();
}catch(IOException e){
e.printStackTrace();
}
}
}
class DoubleConverter{

boolean testDouble(String s){
for(int i=0;i<s.length();i++)
if(s.charAt(i)=='d'||s.charAt(i)=='D') return true;

return false;
}
double doConvert(String s)
{
double val = 0;
try{
ByteArrayInputStream s =new ByteArrayInputStream(s.getBytes());
DataInputStream dis = new DataInputStream(s);
val = dis.readDouble();
s.close();
dis.close();
}catch(Exception e)
{
e.printStackTrace();
}
return val;
}
}