質問編集履歴
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削除しまし
test
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java コードの解説
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test
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削除
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コードを上から順に何をやっているのか解説していただきたいです。
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package com.techscore.nio.chapter1.subject1;
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import java.nio.ByteBuffer;
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import java.nio.IntBuffer;
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/**
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* Main.java
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* TECHSCORE NewIO 1章 実習課題1
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*
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* Copyright (c) 2004 Four-Dimensional Data, Inc.
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*/
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public class Main {
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public static void main(String[] args) {
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Main buff = new Main();
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int[] sizes = {100, 1000, 10000, 100000, 1000000};
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for (int i = 0; i < sizes.length; i++) {
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int size = sizes[i];
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buff.benchMark(size);
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}
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}
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// public void benchMark(int size) {
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private void benchMark(int size) {
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System.out.println("サイズ\t種類\t\t時間\t");
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System.out.println("‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾");
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benckMark(size, true);
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benckMark(size, false);
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System.out.println("‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾");
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}
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private void benckMark(int size, boolean bDirect) {
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IntBuffer buffer = null;
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if (bDirect) {
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buffer = ByteBuffer.allocateDirect(size * 4)
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.asIntBuffer();
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} else {
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buffer = IntBuffer.allocate(size);
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}
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long start = System.currentTimeMillis();
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for (int i = 0; i < size; i++) {
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buffer.put(i, i);
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}
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int[] ints;
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boolean bOK = true;
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try {
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ints = buffer.array();
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} catch (UnsupportedOperationException e) {
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System.out.println(e.getMessage());
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bOK = false;
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}
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if (bOK) {
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System.out.println("OK!");
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}
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long end = System.currentTimeMillis();
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3
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+
////////////////////////////
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System.out.print(size + "\t");
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System.out.print(bufferKind + "\t");
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System.out.println((end - start) + "msec\t");
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}
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}
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