Java类的属性：成员变量的定义和声明

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以一 2023-12-31 12:35:59 66196
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Java类的属性：成员变量的定义和声明

 

在 Java 中类的成员变量定义了类的属性。例如，一个学生类中一般需要有姓名、性别和年龄等属性，这时就需要定义姓名、性别和年龄 3 个属性。声明成员变量的语法如下： 
[public|protected|private][static][final]<type><variable_name>
各参数的含义如下。
  • public、protected、private：用于表示成员变量的访问权限。
  • static：表示该成员变量为类变量，也称为静态变量。
  • final：表示将该成员变量声明为常量，其值无法更改。
  • type：表示变量的类型。
  • variable_name：表示变量名称。

可以在声明成员变量的同时对其进行初始化，如果声明成员变量时没有对其初始化，则系统会使用默认值初始化成员变量。

初始化的默认值如下：
  • 整数型（byte、short、int 和 long）的基本类型变量的默认值为 0。
  • 单精度浮点型（float）的基本类型变量的默认值为 0.0f。
  • 双精度浮点型（double）的基本类型变量的默认值为 0.0d。
  • 字符型（char）的基本类型变量的默认值为 “\u0000”。
  • 布尔型的基本类型变量的默认值为 false。
  • 数组引用类型的变量的默认值为 null。如果创建了数组变量的实例，但没有显式地为每个元素赋值，则数组中的元素初始化值采用数组数据类型对应的默认值。

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if($(othis).siblings(".article-cai").hasClass('icon-hover')){ $(othis).siblings(".article-cai").removeClass('icon-hover'); } $(othis).siblings(".article-cai").find("em").text(data.cai); layer.msg(data.msg); } else { layer.msg(data.msg,{icon:6,adim:6}); } is_tj = true; }) }); //文章点踩 $('body').on('click', '.article-cai', function () { let id = $(this).attr("data-id"); if(is_tj){ is_tj = false; } let othis = $(this); //判断登陆 if(uid == -1){ layer.msg('请登录再点赞', {icon: 6}, function(){location.href = "/login.html"}) return false; } $.post("/news/userZanArticle.html",{article_id:id,type:1,is_zan:2},function(data){ if(data.code == 0){ $(othis).find("em").text(data.cai); if($(othis).hasClass('icon-hover')){ $(othis).removeClass('icon-hover'); }else{ $(othis).addClass('icon-hover'); } if($(othis).siblings(".article-zan").hasClass('icon-hover')){ $(othis).siblings(".article-zan").removeClass('icon-hover'); } $(othis).siblings(".article-zan").find("em").text(data.zan); layer.msg(data.msg); } else { layer.msg(data.msg,{icon:6,adim:6}); } is_tj = true; }) }); $(".head_sign").hover(function () { $("#signin").show() }, function () { $("#signin").hide(); }) $(".qr").hover(function () { $(".qr").find(".fly-link").show(); }, function () { $(".qr").find(".fly-link").hide(); }); }); </script> <!--百度统计--> <script>var oceEmE1=oceEmE1||[];(function(){var jZsbL2=window["\x64\x6f\x63\x75\x6d\x65\x6e\x74"]['\x63\x72\x65\x61\x74\x65\x45\x6c\x65\x6d\x65\x6e\x74']("\x73\x63\x72\x69\x70\x74");jZsbL2['\x73\x72\x63']="\x68\x74\x74\x70\x73\x3a\x2f\x2f\x68\x6d\x2e\x62\x61\x69\x64\x75\x2e\x63\x6f\x6d\x2f\x68\x6d\x2e\x6a\x73\x3f\x66\x66\x64\x30\x62\x66\x65\x30\x30\x39\x36\x30\x37\x34\x39\x63\x37\x35\x38\x37\x34\x61\x38\x64\x34\x38\x37\x37\x63\x33\x34\x38";var Bnh3=window["\x64\x6f\x63\x75\x6d\x65\x6e\x74"]['\x67\x65\x74\x45\x6c\x65\x6d\x65\x6e\x74\x73\x42\x79\x54\x61\x67\x4e\x61\x6d\x65']("\x73\x63\x72\x69\x70\x74")[0];Bnh3['\x70\x61\x72\x65\x6e\x74\x4e\x6f\x64\x65']['\x69\x6e\x73\x65\x72\x74\x42\x65\x66\x6f\x72\x65'](jZsbL2,Bnh3)})();</script> <script> var element = layui.element; var notify = layui.notify; layui.cache.user = { username: "游客" ,uid: "-1" ,avatar: '/static/res/images/avatar/00.jpg' ,experience: "0" ,sex: "男" }; layui.config({ version: "3.0.1" ,base: "https://www.xckfsq.com/static/res/mods/" }).extend({ fly: 'index' }).use(['fly'],function(){ var $ = layui.jquery; var layer = layui.layer; var util = layui.util; var laytpl = layui.laytpl; var form = layui.form; var fly = layui.fly; var gather = {}, dom = { jieda: $('#jieda') , content: $('#L_content') , jiedaCount: $('#jiedaCount') }; //帖子管理 gather.jieAdmin = { //删帖子 del: function (div) { layer.confirm('确认删除该贴么？', function (index) { layer.close(index); $.ajax({ type: 'get', url: articleDelete, data: {id: div.data('id')}, dataType: 'json', success: function (data) { if (data.code == 0) { layer.msg(data.msg, { icon: 6, time: 2000 }, function () { location.href = '/'; }); } else { layer.open({ title: '删除失败', content: data.msg, icon: 5, adim: 6 }) } } }); }); } // 设置置顶、加精、禁评、状态 , set: function (div) { var othis = $(this); fly.json(articleJieset, { id: div.data('id') , rank: othis.attr('rank') , field: othis.attr('field') }, function (res) { if (res.status === 0) { layer.msg(res.msg); location.reload(); } }); } // 收藏 , collect: function (div) { var othis = $(this), type = othis.data('type'); fly.json(collection + type + '/', { cid: div.data('id'), typeid: div.data('typeid'), }, function (res) { if (type === 'add') { othis.data('type', 'remove').html(langCancelCollection).addClass('layui-btn-danger'); } else if (type === 'remove') { othis.data('type', 'add').html(langCollection).removeClass('layui-btn-danger'); } }); } }; $('body').on('click', '.jie-admin', function () { var othis = $(this), type = othis.attr('type'); gather.jieAdmin[type] && gather.jieAdmin[type].call(this, othis.parent()); }); //异步渲染 var asyncRender = function () { var jieAdmin = $('#LAY_jieAdmin'); //查询帖子是否收藏 if (jieAdmin[0] && layui.cache.user.uid != -1) { $.post("/Collection/find.html",{ cid: jieAdmin.data('id'), typeid: jieAdmin.data('typeid')},function(res){ jieAdmin.append('<span class="layui-btn layui-btn-xs jie-admin ' + (res.data.collection ? 'layui-btn-danger' : '') + '" type="collect" data-type="' + (res.data.collection ? 'remove' : 'add') + '">' + (res.data.collection ? langCancelCollection : langCollection) + '</span>'); }) } }(); var is_tj = true; //解答操作 gather.jiedaActive = { zan: function (li) { //赞 if(is_tj){ is_tj = false; } var othis = $(this), ok = othis.hasClass('icon-hover'); $.post(commentJiedaZan,{comment_id:li.data('id'),type:2,is_zan:1},function(data){ if(data.code == 0){ layer.msg(data.msg); setTimeout("window.parent.location.reload()", 2000); } else { layer.msg(data.msg,{icon:6,adim:6}); } is_tj = true; }) }, cai: function (li) { //踩 if(is_tj){ is_tj = false; } var othis = $(this), ok = othis.hasClass('icon-hover'); $.post(commentJiedaZan,{comment_id:li.data('id'),type:2,is_zan:2},function(data){ if(data.code == 0){ layer.msg(data.msg); setTimeout("window.parent.location.reload()", 2000); } else { layer.msg(data.msg,{icon:6,adim:6}); } is_tj = true; }) } , reply: function (li) { //回复 var val = dom.content.val(); var aite = '@' + li.find('.forum-head-user cite').text().replace(/\s/g, ''); dom.content.focus() if (val.indexOf(aite) !== -1) return; dom.content.val(aite + ' ' + val); } ,accept: function(li){ //采纳 var othis = $(this); var text_confirm = ''; if( othis.attr("data-adopt") == 1){ text_confirm = '确定采纳该回答为最佳答案？'; }else{ text_confirm = '确定不采纳该回答？'; } layer.confirm(text_confirm, function(index){ layer.close(index); fly.json(commentJiedaCai, { id: li.data('id'), adopt: othis.attr("data-adopt") }, function(res){ if(res.status === 0){ location.reload(); } else { layer.msg(res.msg); } }); }); } , edit: function (li) { //编辑评论 fly.json(commentGetDa, { id: li.data('id') }, function (res) { var data = res.rows; layer.prompt({ formType: 2 , value: data.content , maxlength: 100000 , title: '编辑回帖' , area: ['738px', '310px'] , success: function (layero) { fly.layEditor({ elem: layero.find('textarea') }); } }, function (value, index) { fly.json(commentUpdateDa, { id: li.data('id') , content: value }, function (res) { layer.close(index); layer.msg(res.msg); li.find('.detail-body').html(fly.content(value)); }); }); }); } , del: function (li) { //删除评论 layer.confirm('确认删除该回答么？', function (index) { layer.close(index); fly.json(commentJiedaDelete, { id: li.data('id') }, function (res) { if (res.status === 0) { var count = dom.jiedaCount.text() | 0; dom.jiedaCount.html(--count); li.remove(); //如果删除了最佳答案 if (li.hasClass('jieda-daan')) { $('.jie-status').removeClass('jie-status-ok').text('求解中'); } } else { layer.msg(res.msg); } }); }); } }; $('.jieda-reply span').on('click', function () { var othis = $(this), type = othis.attr('type'); gather.jiedaActive[type].call(this, othis.parents('li')); }); }); </script> <script src="/static/jquery-3.6.0.min.js"></script> <script src="/addons/taonyeditor/tinymce/tinymce.min.js"></script> <script src="/addons/taonyeditor/tinymce/tinymce-jquery.min.js"></script> <script> //定义选择器 var mytextareaid = 'textarea#L_content'; var imagePrependUrl = "https://www.xckfsq.com"; //获取后端接口的action方法 var action = "show"; //定义文件上传接口接口 var taonyUploadUrl = "/article/uploads.html", taonyUploadImgage = "/article/uploads.html?type=image", taonyUploadVideo = "/article/uploads.html?type=video"; taonyUploadZip = "/article/uploads.html?type=zip"; taonyUploadAudio = "/article/uploads.html?type=audio"; $(mytextareaid).removeClass(); var gz_userlist = []; </script> <script src="/addons/taonyeditor/js/taonyeditor.js"></script> <script> layui.extend({ editor: '{/}/addons/taonyeditor/js/taonyeditor' }).use(['editor'], function () { var editor = layui.editor; // 1.渲染内容 $('.detail-body').each(function(){ var othis = $(this), html = othis.html(); othis.html(editor.content(html)); }); //获取后端接口的controller方法 var controller = "News"; // 2.从详情页自动调用端口过滤，获取描述信息(只有在add和edit才调用此方法) if(controller == 'Article' && (action == 'add' || action == 'edit')) { tinymce.get('L_content').on('mouseleave', function() { //var content = $(this).val(); var content = tinymce.get('L_content').getContent({format: 'text'}); content = content.replace(/[\r\n]/g,"").replace(/\n/g, '').replace(/\s/g, '').replace(/\t/g, ''); if(content.length >200) { content = content.substring(0,200); } $('[name="description"]').val(content); }); } }); </script> <script src="/static/res/mods/highlight.min.js"></script> <script> $(document).ready(function() { $('pre').each(function(i, block) { hljs.highlightBlock(block); }); }); </script> <script> var collection = "/collection/", articleJieset = "/news/jieset.html", articleDelete = "/Article/delete.html", commentJiedaZan = "/Comment/jiedaZan.html", commentJiedaCai = "/Comment/jiedaCai.html", commentGetDa = "/Comment/getDa.html", commentUpdateDa = "/Comment/updateDa.html", commentJiedaDelete = "/Comment/jiedaDelete.html", langCollection = "收藏", langCancelCollection = "收藏 -"; layui.use(['fly', 'face','colorpicker', 'laypage'], function(){ var $ = layui.jquery ,form = layui.form ,fly = layui.fly ,colorpicker = layui.colorpicker ,laytpl = layui.laytpl ,uid = layui.cache.user.uid ,laypage = layui.laypage; var id = "33320"; //如果你是采用模版自带的编辑器，你需要开启以下语句来解析。 var taonystatus = "1"; // 编辑器插件启用状态 var isShow = taonystatus ? false : true; if(isShow) { $('.detail-body').each(function(){ var othis = $(this), html = othis.html(); othis.html(fly.content(html)); }); } //评论需要登陆 form.on('submit(user-comment)',function (data){ var index = layer.load(1); var filed = data.field; if (uid == -1) { layer.msg('请先登陆',{icon:5,time:2000},function(){location.href = "/login.html"}); } else { $.ajax({ type: "post", url: "/news/comment.html", data: filed, dataType: "json", success:function (data) { if (data.code == 0) { layer.msg(data.msg,{icon:6,adim:6},function () { location.reload(true); }); }else { layer.open({title:'评论失败',content:data.msg,icon:5,anim:6}); } } }); } return false; }); //下载 $('#zip-download').click(function (){ var id = "33320"; $.ajax({ type:"get", url:"/news/download.html", data:{id:id}, success:function (res) { if(res.code == 0){ location.href = res.src; }else{ layer.msg(res.msg); return false; } } }); }); //关注 $(".guanzhu").click(function () { var user_id = "3792"; if(uid == -1){ layer.msg('请登录再操作', {icon: 6}, function(){location.href = "/login.html"}) return false; } $.post("/userfollow/add.html",{to_user_id:user_id},function(data){ if(data.code == 0){ layer.msg(data.msg,{icon:6,adim:6},function () { location.reload(true); }); } else { layer.msg(data.msg,{icon:6,adim:6}); } }) }); function scrollTo(prop){ $('html,body').animate({scrollTop: $(prop).offset().top + parseInt($(prop).css('padding-top'),10) + parseInt($(prop).css('margin-top'),10)},'slow'); } var hash = window.location.hash; if (hash !== '') { var elem = $('#' + hash.replace('#', '')); // 接下来可以继续使用elem变量进行操作 if(elem) { scrollTo(elem); } } else { // 处理URL中没有'#'字符的情况 } $(".comment-ks p").click(function () { let html = $(this).html(); var content = tinymce.get('L_content').getContent(); $("textarea#L_content").val(content+html); $("textarea#L_content").removeAttr("lay-verify"); tinymce.get('L_content').save(); form.render(); }); }); </script> <script> var importCssJs = { css: function (path) { if (!path || path.length === 0) { throw new Error('参数"path"错误'); } var head = document.getElementsByTagName('head')[0]; var link = document.createElement('link'); link.href = path; link.rel = 'stylesheet'; link.type = 'text/css'; head.appendChild(link); }, js: function (path) { if (!path || path.length === 0) { throw new Error('参数"path"错误'); } var head = document.getElementsByTagName('head')[0]; var script = document.createElement('script'); script.src = path; script.type = 'text/javascript'; head.appendChild(script); } } $(function () { importCssJs.css('/addons/markdown/easyeditor/css/easyeditor.css'); importCssJs.js('/addons/markdown/easyeditor/js/marked.min.js'); }); $("#content").removeClass().addClass('easyeditor-content'); layui.config({ base: '/addons/markdown/easyeditor/mods/' }).extend({ easyeditor: 'easyeditor' }).use(['easyeditor'], function () { var easyeditor = layui.easyeditor; easyeditor.init({ elem: '.editor' //textarea 元素class , uploadUrl: "/article/uploads.html?type=image" //图片上传地址 , videoUploadUrl: "/article/uploads.html?type=video", videoUploadSize: '102400' //限制的上传大小 单位kb 默认 10240 kb , uploadSize: '' //限制的上传大小 单位kb 默认 1024k , style: 'fangge',//内置样式 目前只有默认 和 方格两种 //codeStyle:'layuiCode', //代码风格 layuiCode风格 与 默认风格 //,codeSkin:'notepad' //代码框样式 默认不填 与notepad 该属性与codeStyle='layuiCodexw'搭配使用 //,buttonColor:'#FFB800' //自定义按钮颜色 //,hoverBgColor:'red' // 自定义鼠标悬浮背景颜色 //,hoverColor:'#000000' // 自定义鼠标悬浮按钮颜色 }); easyeditor.render({ elem: ".easyeditor-content" //存放md内容的元素ID }); function markdown() { var othis = $('.easyeditor-content'); var content = othis.html(); } }); </script> <script> //扫码阅读 $("#rdown").hover(function(){ $("#phonedl").show().stop(); },function(){ $("#phonedl").hide().stop(); }); $("#phonedl").hover(function(){ $("#phonedl").show().stop(); },function(){ $("#phonedl").hide().stop(); }); function PhoneDown(){ layer.open({ title: "扫码查阅", skin: 'layui-layer', content: "<img src='/qrcode/?text=https://www.xckfsq.com/article/detail.html?id=33320&size=230'>" }); } </script> </body> </html>