Lessons4JavaSE/src/unit06/FixedLengthStringIO.java at master · AlohaWorld/Lessons4JavaSE · GitHub

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package unit06;

import java.io.*;

public class FixedLengthStringIO {

/** Read fixed number of characters from a DataInput stream */

public static String readFixedLengthString(int size, DataInput in) throws IOException {

// Declare an array of characters

char[] chars = new char[size];

// Read fixed number of characters to the array

for (int i = 0; i < size; i++)

chars[i] = in.readChar();

return new String(chars);

}

/** Write fixed number of characters to a DataOutput stream */

public static void writeFixedLengthString(String s, int size, DataOutput out) throws IOException {

char[] chars = new char[size];

// Fill in string with characters

s.getChars(0, s.length(), chars, 0);

// Fill in blank characters in the rest of the array

for (int i = Math.min(s.length(), size); i < chars.length; i++)

chars[i] = ' ';

// Create and write a new string padded with blank characters

out.writeChars(new String(chars));

}

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