58 lines
1.5 KiB
Java
58 lines
1.5 KiB
Java
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File Input and Output Stream
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import java.io.*;
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class FileIO {
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public static void main(String[] args) {
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System.out.println("Enter some numbers.");
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StreamTokenizer st = new StreamTokenizer(
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new BufferedReader(new InputStreamReader(System.in)));
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File f = new File("temp.out");
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int numberCount = 0;
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try {
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DataOutputStream dos = new DataOutputStream(
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new BufferedOutputStream(new FileOutputStream(f)));
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while (st.nextToken() != st.TT_EOF) {
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if (st.ttype == st.TT_NUMBER) {
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dos.writeDouble(st.nval);
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numberCount++;
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}
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}
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System.out.println("numberCount=" + numberCount);
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dos.flush();
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dos.close();
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DataInputStream dis = new DataInputStream(
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new BufferedInputStream(new FileInputStream(f)));
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for (int i = 0; i < numberCount; i++) {
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System.out.println("number=" + dis.readDouble());
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}
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dis.close();
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} catch (IOException e) {
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System.err.println("FileIO: " + e);
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} finally {
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f.delete();
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}
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}
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}
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/* ............... Example compile and run(s)
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% javac file.java
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% java FileIO
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Enter some numbers.
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1 2 3
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4.4 5.5
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6.67
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^D
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numberCount=6
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number=1.0
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number=2.0
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number=3.0
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number=4.4
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number=5.5
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number=6.67
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... end of example run(s) */
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