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881 lines
38 KiB
HTML
881 lines
38 KiB
HTML
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<meta name="description" content="选择排序大概的思想就是，每一次循环找出需要排序的部分中最小的那个数，找出只有再将最小的那个数移动到它应该放置的那个位置。因为虽然他的遍历次数也是1+2+3+…+n-1,不过它每次循环只交换一次，总的来说效率还是比直接插入排序好一些。更详细的解释参考百度百科和维基百科。 下面上代码吧： 123456789101112131415161718192021222324252627282930313233">
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<meta property="og:title" content="java实现选择排序">
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<meta property="og:url" content="https://toozhao.com/2012/09/11/java-select-sorting/">
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<meta property="og:site_name" content="大染志">
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<meta property="og:description" content="选择排序大概的思想就是，每一次循环找出需要排序的部分中最小的那个数，找出只有再将最小的那个数移动到它应该放置的那个位置。因为虽然他的遍历次数也是1+2+3+…+n-1,不过它每次循环只交换一次，总的来说效率还是比直接插入排序好一些。更详细的解释参考百度百科和维基百科。 下面上代码吧： 123456789101112131415161718192021222324252627282930313233">
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<meta property="og:locale" content="zh_CN">
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<meta property="article:published_time" content="2012-09-11T14:00:00.000Z">
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<meta property="article:modified_time" content="2026-08-11T12:22:51.369Z">
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<meta property="article:author" content="Junv">
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<meta property="article:tag" content="java">
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<meta property="article:tag" content="算法">
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<meta property="article:tag" content="选择排序">
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<title>java实现选择排序 | 大染志</title>
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body[data-rtheme="green"] .post-body h1, body[data-rtheme="green"] .post-body h2,
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body[data-rtheme="green"] .post-body table tr:nth-child(even) { background: #dcecdd; }
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java实现选择排序
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<div class="post-body" itemprop="articleBody"><p>选择排序大概的思想就是，每一次循环找出需要排序的部分中最小的那个数，找出只有再将最小的那个数移动到它应该放置的那个位置。因为虽然他的遍历次数也是1+2+3+…+n-1,不过它每次循环只交换一次，总的来说效率还是比直接插入排序好一些。更详细的解释参考<a target="_blank" rel="noopener" href="http://baike.baidu.com/view/547263.htm">百度百科</a>和<a target="_blank" rel="noopener" href="http://zh.wikipedia.org/zh/%E9%80%89%E6%8B%A9%E6%8E%92%E5%BA%8F">维基百科</a>。</p>
|
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<p>下面上代码吧：</p>
|
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<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">package</span> com.toozhao.sort;</span><br><span class="line"></span><br><span class="line"><span class="comment">/**</span></span><br><span class="line"><span class="comment"> *</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@author</span> Junv</span></span><br><span class="line"><span class="comment"> *</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"><span class="keyword">public</span> <span class="keyword">class</span> <span class="title class_">SelectSort</span> {</span><br><span class="line"> <span class="comment">// 定义需要排序的数</span></span><br><span class="line"> <span class="keyword">private</span> <span class="keyword">static</span> <span class="type">int</span>[] array = { <span class="number">10</span>, <span class="number">50</span>, <span class="number">8</span>, <span class="number">29</span>, <span class="number">30</span>, <span class="number">17</span>, <span class="number">12</span>, <span class="number">40</span>, <span class="number">32</span>, <span class="number">7</span>, <span class="number">4</span>, <span class="number">22</span> };</span><br><span class="line"></span><br><span class="line"> <span class="keyword">public</span> <span class="keyword">static</span> <span class="keyword">void</span> <span class="title function_">main</span><span class="params">(String args[])</span> {</span><br><span class="line"> sort(array);</span><br><span class="line"> <span class="keyword">for</span> (<span class="type">int</span> flag : array) {</span><br><span class="line"> System.out.print(flag + <span class="string">" "</span>);</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="keyword">public</span> <span class="keyword">static</span> <span class="keyword">void</span> <span class="title function_">sort</span><span class="params">(<span class="type">int</span>[] data)</span> {</span><br><span class="line"> <span class="comment">// 外层循环一次，找到i to (data.length-1)这个数组中最小的一个数。</span></span><br><span class="line"> <span class="keyword">for</span> (<span class="type">int</span> <span class="variable">i</span> <span class="operator">=</span> <span class="number">0</span>; i < (data.length - <span class="number">1</span>); i++) {</span><br><span class="line"> <span class="comment">// temp用来标注值最小的那个数。</span></span><br><span class="line"> <span class="type">int</span> <span class="variable">temp</span> <span class="operator">=</span> i;</span><br><span class="line"> <span class="keyword">for</span> (<span class="type">int</span> <span class="variable">j</span> <span class="operator">=</span> i + <span class="number">1</span>; j < data.length; j++) {</span><br><span class="line"> <span class="comment">// 将temp 始终标记为最小那个数。</span></span><br><span class="line"> <span class="keyword">if</span> (data[j] < data[temp]) {</span><br><span class="line"> temp = j;</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line"> <span class="comment">// 如果i != temp 说明，最小那个数为data[temp],则交换。</span></span><br><span class="line"> <span class="keyword">if</span> (i != temp) {</span><br><span class="line"> <span class="type">int</span> <span class="variable">t</span> <span class="operator">=</span> data[i];</span><br><span class="line"> data[i] = data[temp];</span><br><span class="line"> data[temp] = t;</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
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<p>如需下载完整代码，以及其他排序代码，请到：</p>
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<figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line"></span><br></pre></td></tr></table></figure>
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|
||
支持：背景主题 / 字体类型 / 字号 / 行距 / 重置，localStorage 记忆
|
||
========================================================= */
|
||
(function () {
|
||
'use strict';
|
||
var LS_KEY = 'toozhao-reading';
|
||
var state = { theme: 'light', font: 'system', size: 1.05, spacing: 'cozy' };
|
||
|
||
var FONTS = {
|
||
system: '', /* 默认（Linux 系统字体） */
|
||
serif: 'Georgia, "Noto Serif SC", "Source Han Serif SC", "Songti SC", SimSun, serif',
|
||
sans: '"Noto Sans SC", "Source Han Sans SC", "Microsoft YaHei", "PingFang SC", "WenQuanYi Micro Hei", sans-serif',
|
||
kai: '"KaiTi", "STKaiti", "Kaiti SC", "AR PL UKai CN", serif',
|
||
mono: 'SFMono-Regular, Consolas, "Liberation Mono", Menlo, monospace'
|
||
};
|
||
var THEMES = { light: '明亮', paper: '纸感', green: '护眼', night: '夜间' };
|
||
var SPACING = {
|
||
compact: { label: '紧凑', lh: 1.6 },
|
||
cozy: { label: '舒适', lh: 1.9 },
|
||
relaxed: { label: '宽松', lh: 2.3 }
|
||
};
|
||
|
||
function loadState() {
|
||
try {
|
||
var raw = localStorage.getItem(LS_KEY);
|
||
if (!raw) return;
|
||
var s = JSON.parse(raw);
|
||
if (THEMES[s.theme]) state.theme = s.theme;
|
||
if (FONTS.hasOwnProperty(s.font)) state.font = s.font;
|
||
if (typeof s.size === 'number' && s.size >= 0.8 && s.size <= 1.5) state.size = s.size;
|
||
if (SPACING[s.spacing]) state.spacing = s.spacing;
|
||
} catch (e) { /* ignore */ }
|
||
}
|
||
|
||
function saveState() {
|
||
try { localStorage.setItem(LS_KEY, JSON.stringify(state)); } catch (e) { /* ignore */ }
|
||
}
|
||
|
||
function buildUI() {
|
||
if (document.getElementById('reading-toggle')) return;
|
||
|
||
var toggle = document.createElement('button');
|
||
toggle.id = 'reading-toggle';
|
||
toggle.className = 'reading-toggle';
|
||
toggle.title = '阅读设置';
|
||
toggle.textContent = 'Aa';
|
||
document.body.appendChild(toggle);
|
||
|
||
var panel = document.createElement('div');
|
||
panel.id = 'reading-panel';
|
||
panel.className = 'reading-panel';
|
||
|
||
// 主题（swatch 全部为硬编码静态 HTML，无用户输入，安全）
|
||
var rowT = document.createElement('div');
|
||
rowT.className = 'rp-row';
|
||
rowT.innerHTML = '<h4>主题</h4><div class="rp-themes">' +
|
||
['light', 'paper', 'green', 'night'].map(function (t) {
|
||
return '<button class="sw sw-' + t + '" data-theme="' + t + '" title="' + THEMES[t] + '"><span></span>' + THEMES[t] + '</button>';
|
||
}).join('') + '</div>';
|
||
|
||
var rowF = document.createElement('div');
|
||
rowF.className = 'rp-row';
|
||
rowF.innerHTML = '<h4>字体</h4><div class="rp-fonts">' +
|
||
['system', 'serif', 'sans', 'kai', 'mono'].map(function (f) {
|
||
var label = { system: '系统', serif: '宋体', sans: '黑体', kai: '楷体', mono: '等宽' }[f];
|
||
return '<button data-font="' + f + '">' + label + '</button>';
|
||
}).join('') + '</div>';
|
||
|
||
var rowS = document.createElement('div');
|
||
rowS.className = 'rp-row';
|
||
rowS.innerHTML = '<h4>字号</h4><div class="rp-size">' +
|
||
'<button class="rp-minus" title="减小">A−</button><span class="rp-size-val">17px</span><button class="rp-plus" title="增大">A+</button></div>';
|
||
|
||
var rowSp = document.createElement('div');
|
||
rowSp.className = 'rp-row';
|
||
rowSp.innerHTML = '<h4>行距</h4><div class="rp-spacing">' +
|
||
['compact', 'cozy', 'relaxed'].map(function (s) {
|
||
return '<button data-spacing="' + s + '">' + SPACING[s].label + '</button>';
|
||
}).join('') + '</div>';
|
||
|
||
var reset = document.createElement('button');
|
||
reset.className = 'rp-reset';
|
||
reset.textContent = '↺ 恢复默认';
|
||
reset.addEventListener('click', function () {
|
||
state = { theme: 'light', font: 'system', size: 1.05, spacing: 'cozy' };
|
||
saveState();
|
||
apply();
|
||
render();
|
||
});
|
||
|
||
panel.appendChild(rowT);
|
||
panel.appendChild(rowF);
|
||
panel.appendChild(rowS);
|
||
panel.appendChild(rowSp);
|
||
panel.appendChild(reset);
|
||
document.body.appendChild(panel);
|
||
|
||
toggle.addEventListener('click', function (e) {
|
||
e.stopPropagation();
|
||
panel.classList.toggle('open');
|
||
toggle.classList.toggle('active', panel.classList.contains('open'));
|
||
});
|
||
panel.addEventListener('click', function (e) { e.stopPropagation(); });
|
||
|
||
panel.querySelectorAll('.sw').forEach(function (b) {
|
||
b.addEventListener('click', function () { state.theme = b.dataset.theme; saveState(); apply(); render(); });
|
||
});
|
||
panel.querySelectorAll('.rp-fonts button').forEach(function (b) {
|
||
b.addEventListener('click', function () { state.font = b.dataset.font; saveState(); apply(); render(); });
|
||
});
|
||
panel.querySelectorAll('.rp-spacing button').forEach(function (b) {
|
||
b.addEventListener('click', function () { state.spacing = b.dataset.spacing; saveState(); apply(); render(); });
|
||
});
|
||
panel.querySelector('.rp-minus').addEventListener('click', function () {
|
||
state.size = Math.max(0.8, +(state.size - 0.05).toFixed(2)); saveState(); apply(); render();
|
||
});
|
||
panel.querySelector('.rp-plus').addEventListener('click', function () {
|
||
state.size = Math.min(1.5, +(state.size + 0.05).toFixed(2)); saveState(); apply(); render();
|
||
});
|
||
|
||
document.addEventListener('click', function (e) {
|
||
if (panel.classList.contains('open') && !panel.contains(e.target) && e.target !== toggle) {
|
||
panel.classList.remove('open');
|
||
toggle.classList.remove('active');
|
||
}
|
||
});
|
||
document.addEventListener('keydown', function (e) {
|
||
if (e.key === 'Escape' && panel.classList.contains('open')) {
|
||
panel.classList.remove('open');
|
||
toggle.classList.remove('active');
|
||
}
|
||
});
|
||
}
|
||
|
||
function apply() {
|
||
var body = document.body;
|
||
var pb = document.querySelector('.post-body');
|
||
|
||
body.setAttribute('data-rtheme', state.theme);
|
||
if (pb) {
|
||
pb.style.fontFamily = FONTS[state.font] || '';
|
||
pb.style.fontSize = state.size + 'em';
|
||
pb.style.lineHeight = SPACING[state.spacing].lh;
|
||
}
|
||
}
|
||
|
||
function render() {
|
||
var panel = document.getElementById('reading-panel');
|
||
if (!panel) return;
|
||
|
||
panel.querySelectorAll('.sw').forEach(function (b) {
|
||
b.classList.toggle('active', b.dataset.theme === state.theme);
|
||
});
|
||
panel.querySelectorAll('.rp-fonts button').forEach(function (b) {
|
||
b.classList.toggle('active', b.dataset.font === state.font);
|
||
});
|
||
panel.querySelectorAll('.rp-spacing button').forEach(function (b) {
|
||
b.classList.toggle('active', b.dataset.spacing === state.spacing);
|
||
});
|
||
var val = panel.querySelector('.rp-size-val');
|
||
if (val) val.textContent = Math.round(16 * state.size) + 'px';
|
||
}
|
||
|
||
function init() {
|
||
loadState();
|
||
buildUI();
|
||
apply();
|
||
render();
|
||
}
|
||
|
||
if (document.readyState === 'loading') {
|
||
document.addEventListener('DOMContentLoaded', init);
|
||
} else {
|
||
init();
|
||
}
|
||
})();
|
||
</script>
|
||
|
||
</body>
|
||
</html>
|