java程序 输出与输入.ppt

运行结果如下: 请输入字符,输入结束按#： 12345 abcd# 打印从磁盘读入的数据 12345 abcd# 【示例程序c13_8.java】 用FileInputStream和FileOutputStream输入输出流，再套接上DataInputStream类和DataOutputStream类输入输出流完成文件的读写操作。 import java.io.*; public class c13_8 { public static void main(String args[ ]) { boolean lo=true; short si=-32768; int i=65534; long l=134567; float f=(float)1.4567; double d=3.14159265359; String str1=ABCD; String str2=Java语言教学; try { FileOutputStream fout=new FileOutputStream(t1.txt); DataOutputStream out=new DataOutputStream(fout); //文件输出流对象为参数 FileInputStream fin=new FileInputStream(t1.txt); DataInputStream in=new DataInputStream(fin); //文件输入流对象为参数 out.writeBoolean(lo); out.writeShort(si); out.writeByte(i); out.writeInt(i); out.writeLong(l); out.writeFloat(f); out.writeDouble(d); out.writeBytes(str1); out.writeUTF(str2); out.close( ); System.out.println(Blooean lo=+in.readBoolean( )); System.out.println(Short si=+in.readShort( )); System.out.println(Byte i=+in.readByte( )); System.out.println(Int i=+in.readInt( )); System.out.println(Long l=+in.readLong( )); System.out.println(Float f=+in.readFloat( )); System.out.println(Double d=+in.readDouble( )); byte b[ ]=new byte[4]; in.readFully(b); System.out.print(str1=); for(int j=0;j4;j++)System.out.print((char)b[j]); System.out.println( ); System.out.println(str2=+in.readUTF( )); in.close( ); } catch(IOException E) { System.out.println(E.toString( )); } } } 运行结果如下: Boolean lo=true Short si=-32768 Byte i=-2 Int i=65534 Long l=134567 Float f=(float)1.4567 Double d=3.14159265359 str1=ABCD str2=Java语言教学 13.2.4 FileReader类和FileWriter类 表13.10 FileReader类和FileWriter类的构造方法 构 造 方 法 说 明 publicFileReader (String f