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
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); } }}