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Java ObjectInputStream readLine()用法及代碼示例


ObjectInputStream 類的 readLine() 方法讀取以 \n、\r、\r\n 或 EOF 結尾的行。

用法

public String readLine()throws IOException

參數

沒有傳遞參數。

返回

該行的字符串副本。

拋出

IOException - 如果發生其他 I/O 錯誤。

例子1

import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;

public class ObjectInputStreamreadLineExample1  {
   public static void main(String[] args) throws IOException {
      
      String[] buf = {"JavaTpoint" , "  ","provide" , "  ","Tutorial" ,"  ", "for"  ,"  ","all" ," ", "language", "\n" };
      
      try {
         // create file output stream
       FileOutputStream   fileoutstream = new FileOutputStream("file1.txt");
         
         // create data output stream
        DataOutputStream dataoutstream = new DataOutputStream(fileoutstream);
         
         // for each byte in the buffer
         for (String b:buf) {
            // write character to the dos
            dataoutstream.writeChars(b);
         }
         
         // force bytes to the underlying stream
         dataoutstream.flush();
         
         // create file input stream
         InputStream inpstream = new FileInputStream("file1.txt");
         
         // create new data input stream
        DataInputStream datainpstream = new DataInputStream(inpstream);
         
         // read till end of the stream
       
         
            // read character
            String c = datainpstream.readLine();
            
            // print
            System.out.print(c);
         
         
      } catch(Exception e) {
            
         e.printStackTrace();
      } 
   }
}

輸出：

JavaTpoint provide tutorial for all language

例子2

import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;

public class ObjectInputStreamreadLineExample2 {
   public static void main(String[] args) throws IOException {
      
      String[] carray = {"JavaTpoint" , "  ","provide" , "  ","Tutorial" ,"  ", "for"  ,"  ","all" ," ", "language" ,"\n"};
     
      
      try {
         // create file output stream
       FileOutputStream   fileoutstream = new FileOutputStream("barray");
         
         // create data output stream
        DataOutputStream dataoutstream = new DataOutputStream(fileoutstream);
         
         // for each byte in the buffer
         for (String b:carray) {
            // write character to the dos
            dataoutstream.writeChars(b);
         }
         
         // force bytes to the underlying stream
         dataoutstream.flush();
         
         // create file input stream
         InputStream inpstream = new FileInputStream("barray");
         
         // create new data input stream
        DataInputStream datainpstream = new DataInputStream(inpstream);
         
         // read till end of the stream
         for(int i=0;i<=carray.length;i++){ 
         
            // read double values in float format
            String c = datainpstream.readLine();
            
            // print
            System.out.print("    "+c);
         }
         
      } catch(Exception e) {
        
      } 
   }
}

輸出：

JavaTpoint provide tutorial for all language




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