long型和double型数 怎么写进文档 和输出啊 顺便帮看看 我那char型和string型 做法对不
import java.util.Scanner;
import java.io.*;

public class basicType {
public static void main(String[] args){

int a=1;
long b=2;
double d=8.0;
char c='a';
String str="hello";
try{
File inputFile = new File("D:\\JAVA\\test.txt");
File outputFile = new File("D:\\JAVA\\test.txt");
FileReader in=new FileReader(inputFile);
FileWriter out=new FileWriter(outputFile);
out.write(a);
//out.write(b);
//out.write(d);
out.write(c);
out.write(str);
out.close(); //关闭此流，但先刷新它
System.out.println("已将信息写入test.txt");
System.out.println("整型数值为"+in.read());
//System.out.println("长整型数值为"+);
//System.out.println("double型数值为"+);
System.out.println("char为"+(char)in.read());
System.out.print("字符串为");
while(in.ready()) //
{
System.out.print((char)in.read());
}
}catch(IOException e){
System.err.println(e);
}
}
}

long型和double型数 怎么写进文档 和输出啊 顺便帮看看 我那char型和string型 做法对不



[解决办法]
DataOutputStream这个可以写入基本数据类型
[解决办法]
如果想要用程序读写的话，需要用过滤流DataInputStream和DataOutputStream完成，下面是代码实现

Java code

import java.io.*;public class BasicType {    public static void main(String[] args){        int a=1;        long b=2;        double d=8.0;        char c='a';        String str="hello";        try{            File outputFile = new File("test.txt");            FileOutputStream out=new FileOutputStream(outputFile);            DataOutputStream dataOut=new DataOutputStream(out);            dataOut.write(a);            dataOut.writeLong(b);            dataOut.writeDouble(d);            dataOut.write(c);            dataOut.writeUTF(str);            dataOut.close(); //关闭此流，但先刷新它            System.out.println("已将信息写入test.txt");            File inputFile = new File("test.txt");            DataInputStream in=new DataInputStream(new FileInputStream(inputFile));            System.out.println("整型数值为"+in.read());            System.out.println("长整型数值为"+in.readLong());            System.out.println("double型数值为"+in.readDouble());            System.out.println("char为"+(char)in.read());            System.out.print("字符串为"+in.readUTF());            in.close();        }catch(IOException e){            System.err.println(e);        }    }}