包含javadilomen的词条
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本文目录一览：
- 1、java中怎么给对象赋值
- 2、java 编程异常处理器重新抛出异常
- 3、java中"公用类型men必须在它自己的文件中定义"是什么意思？
- 4、java中怎样做多级菜单
- 5、用JAVA定义一个学生类Student来表示学生信息，学生类中包含成员有学号（id）、姓名（name）、年龄和成绩
java中怎么给对象赋值
通常用String ss="asasasa";就可以了，用String str=new String ("men"); 比较麻烦，因为它实际创建了两个字符串，意思就是用“men”这个字符串来初始化str.String str=new String ();
他只是创建了一个字符串对象，可以在后续给他赋值初始化。也可以用他的引用来调用一些String类的方法。
java 编程异常处理器重新抛出异常
statemen4会执行，statemen5不但不会执行，而且不能存在，因为它是无法访问的语句。同时main方法后应加上throws Exception，以声明main将抛出异常。而main（主方法）抛出的异常自然是抛给了java虚拟机了。
java中"公用类型men必须在它自己的文件中定义"是什么意思？
如果一个java文件中有一个public 类，则该文件名字应与public类名一致。比如，有一个文件，A.java，则此文件中的public类名必须为A，一个文件中有且只有一个public类。
如果类A被声明为公共的（public），那么必须将类A保存在名为A.java的文件中；2、反之，在一个文件中最多包含一个顶级的公共类，并且该公共类的名字与文件名相同。比如文件A.java中，允许定义一个或多个类，但最多允许一个顶级的公共类，此类名为A。
扩展资料：
公用类型编程代码：
class Student {
//id，String型，代表学号，并直接赋予初值。
public String id ="12311110336";
//name，String类型，代表姓名，并直接赋予初值。
public String name="周田";
//age,int型，代表年龄，并直接赋予初值。
public int age=18;
//sex,boolen型，代表性别，并直接赋予初值。
public char sex='男';
//isCommunist,boolean型,代表是否入党。
public boolean isCommunist=false;
//score,long型，代表多科总成绩。
public long score=88L;//等号右边是long型数据
} //Student 类定义结束
参考资料来源：百度百科-java
java中怎样做多级菜单
1。sevice层：
/**
* 构建 点取筛取 树形动态菜单
* @return tree
* @throws BasicException
*/
public String buildTree()throws BasicException{
try {
StringBuffer xmlBuffer = new StringBuffer();
int a = 0;
xmlBuffer.append("d.add(0,-1,'input type=\"checkbox\" name=\"ckb\" id=\"0\" onClick=\"check(this.form.ckb)\" value=\"-1\"/全部');");
xmlBuffer.append("\n");
List list = getDao().findFundInvestType();
if(list!=nulllist.size()!=0){
int b = 0;
for(int i=0;ilist.size();i++){
FundInvestType bean = (FundInvestType)list.get(i);
String code = bean.getInvestCode();
// if is sencond
if(code.length()==2){
b++;
a=i;
xmlBuffer.append("d.add("+b+",0,'input type=\"checkbox\" name=\"ckb\" id=\"0"+b+"\" onClick=\"selectAll(this.form.ckb,this.id)\" value=\""+bean.getInvestCode()+"\" /b"+bean.getInvestName()+"/b','');");
xmlBuffer.append("\n");
}else if(code.length()==10){
//if is second
if(code.substring(2,10).equals("00000000")){
b++;
a=i;
xmlBuffer.append("d.add("+b+",0,'input type=\"checkbox\" name=\"ckb\" id=\"0"+b+"\" onClick=\"selectAll(this.form.ckb,this.id)\" value=\""+bean.getInvestCode()+"\"/b"+bean.getInvestName()+"/b','');");
xmlBuffer.append("\n");
}else{//if is third,it father is second
b++;
int k = a+1;
xmlBuffer.append("d.add("+b+","+k+",'input type=\"checkbox\" name=\"ckb\" id=\"ckb0"+k+"\" value=\""+bean.getInvestCode()+"\"/"+bean.getInvestName()+"','');");
xmlBuffer.append("\n");
}
}
}
}
return xmlBuffer.toString();
} catch (RuntimeException e) {
throw new BasicException(e.getMessage());
}
}
2。jsp页面：
%@ page contentType="text/html; charset=utf-8" language="java" import="java.sql.*" errorPage="" %
%
String webapp=request.getContextPath()+"/fund";
%
html
head
meta http-equiv="Content-Type" content="text/html; charset=utf-8" /
title基金投资类型/title
link rel="stylesheet" type="text/css" href="%=webapp%/Pub/Style.css"
link rel="StyleSheet" href="%=webapp%/menu/dtree.css" type="text/css" /
SCRIPT LANGUAGE="JavaScript"
!-- Begin
var checkflag = "false";
function check(field) {
if (checkflag == "false") {
for (i = 1; i field.length; i++) {
field[i].checked = true;
field[i].disabled = true;
}
checkflag = "true";
}else {
for (i = 1; i field.length; i++) {
field[i].checked = false;
field[i].disabled=false;
}
checkflag = "false";
}
}
//------选中二级全选--------
var selectflag = "false";
function selectAll(field,j) {
if (selectflag == "false") {
for (i = 0; i field.length; i++) {
var b ="ckb"+j;
if(field[i].id==b){
field[i].checked = true;
field[i].disabled=true;
selectflag = "true";
}
}
}else {
for (i = 0; i field.length; i++) {
var b ="ckb"+j;
if(field[i].id==b||field[i].id==j){
field[i].checked = false;
field[i].disabled = false;
selectflag = "false";
}
}
}
}
//--------取消二级全选-------
function disabledAll(){
field = document.getElementById("myform");
for (i = 0; i field.length; i++) {
if(field[i].checked == true){
field[i].disabled = true;
checkflag = "false";
selectflag = "false";
}
}
}
//------取消选取--------
function cancelAll(field){
//field = myform.all;
field = document.getElementById("myform");
for (i = 0; i field.length; i++) {
field[i].checked = false;
field[i].disabled=false;
checkflag = "false";
selectflag = "false";
}
}
//单击提交页面
function onSubit(){
var txt = "";
//field = myform.all;
field = document.getElementById("myform");
for (i = 0; i field.length; i++) {
if(field[i].checked == truefield[i].disabled==false){
txt += field[i].value+".";
}
}
//alert("=="+txt);
//取得父窗口对象
var winOpen=window.opener;
winOpen.document.form.fundtype.value=txt;
window.close();
}
// End --
/script
/head
body onLoad="disabledAll()"
script type="text/javascript" src="%=webapp%/menu/dtree_2.js"/script
form name="myform" method="post" id="myform"
table width="250" border="0" cellspacing="0" cellpadding="5"
tr
td colspan="2"table width="100%" border=0 cellpadding=0 cellspacing=0 bgcolor="#FFFFFF"
tr
td基金投资类型/td
/tr
tr
td
div class="dtree"
script type="text/javascript"
!--//
d = new dTree('d');
${tree}
document.write(d);
//--
/script
/div
/td
/tr
/table/td
/tr
tr height="25"
td width="86" height="0"align="center"a href="#" onClick="onSubit()"img src="%=webapp%/img/btn_sure.gif" width="51" height="21" border="0"/a/td
td width="144" height="0"a href="#" onClick="cancelAll()"img src="%=webapp%/img/btn_cancel.gif" width="51" height="21" border="0"/a/td
/tr
/table
/form
/body
/html
3。js文件：
// Node object
function Node(id, pid, name, url, title, target, icon, iconOpen, open) {
this.id = id;
this.pid = pid;
this.name = name;
this.url = url;
this.title = title;
this.target = target;
this.icon = icon;
this.iconOpen = iconOpen;
this._io = open || false;
this._is = false;
this._ls = false;
this._hc = false;
this._ai = 0;
this._p;
};
// Tree object
function dTree(objName) {
this.config = {
target : null,
folderLinks : true,
useSelection : true,
useCookies : true,
useLines : true,
useIcons : true,
useStatusText : false,
closeSameLevel : false,
inOrder : false
}
this.icon = {
root : './fund/menu/img/base.gif',
folder : './fund/menu/img/folder.gif',
folderOpen : './fund/menu/img/folderopen.gif',
node : './fund/menu/img/page.gif',
empty : './fund/menu/img/empty.gif',
line : './fund/menu/img/line.gif',
join : './fund/menu/img/join.gif',
joinBottom : './fund/menu/img/joinbottom.gif',
plus : './fund/menu/img/plus.gif',
plusBottom : './fund/menu/img/plusbottom.gif',
minus : './fund/menu/img/minus.gif',
minusBottom : './fund/menu/img/minusbottom.gif',
nlPlus : './fund/menu/img/nolines_plus.gif',
nlMinus : './fund/menu/img/nolines_minus.gif'
};
this.obj = objName;
this.aNodes = [];
this.aIndent = [];
this.root = new Node(-1);
this.selectedNode = null;
this.selectedFound = false;
this.completed = false;
};
// Adds a new node to the node array
dTree.prototype.add = function(id, pid, name, url, title, target, icon, iconOpen, open) {
this.aNodes[this.aNodes.length] = new Node(id, pid, name, url, title, target, icon, iconOpen, open);
};
// Open/close all nodes
dTree.prototype.openAll = function() {
this.oAll(true);
};
dTree.prototype.closeAll = function() {
this.oAll(false);
};
// Outputs the tree to the page
dTree.prototype.toString = function() {
var str = 'div class="dtree"\n';
if (document.getElementById) {
if (this.config.useCookies) this.selectedNode = this.getSelected();
str += this.addNode(this.root);
} else str += 'Browser not supported.';
str += '/div';
if (!this.selectedFound) this.selectedNode = null;
this.completed = true;
return str;
};
// Creates the tree structure
dTree.prototype.addNode = function(pNode) {
var str = '';
var n=0;
if (this.config.inOrder) n = pNode._ai;
for (n; nthis.aNodes.length; n++) {
if (this.aNodes[n].pid == pNode.id) {
var cn = this.aNodes[n];
cn._p = pNode;
cn._ai = n;
this.setCS(cn);
if (!cn.target this.config.target) cn.target = this.config.target;
if (cn._hc !cn._io this.config.useCookies) cn._io = this.isOpen(cn.id);
if (!this.config.folderLinks cn._hc) cn.url = null;
if (this.config.useSelection cn.id == this.selectedNode !this.selectedFound) {
cn._is = true;
this.selectedNode = n;
this.selectedFound = true;
}
str += this.node(cn, n);
if (cn._ls) break;
}
}
return str;
};
// Creates the node icon, url and text
dTree.prototype.node = function(node, nodeId) {
var str = 'div class="dTreeNode"' + this.indent(node, nodeId);
if (this.config.useIcons) {
if (!node.icon) node.icon = (this.root.id == node.pid) ? this.icon.root : ((node._hc) ? this.icon.folder : this.icon.node);
if (!node.iconOpen) node.iconOpen = (node._hc) ? this.icon.folderOpen : this.icon.node;
if (this.root.id == node.pid) {
node.icon = this.icon.root;
node.iconOpen = this.icon.root;
}
str += 'img id="i' + this.obj + nodeId + '" src="' + ((node._io) ? node.iconOpen : node.icon) + '" alt="" /';
}
if (node.url) {
str += 'a id="s' + this.obj + nodeId + '" class="' + ((this.config.useSelection) ? ((node._is ? 'nodeSel' : 'node')) : 'node') + '" href="' + node.url + '"';
if (node.title) str += ' title="' + node.title + '"';
if (node.target) str += ' target="' + node.target + '"';
if (this.config.useStatusText) str += ' onmouseover="window.status=\'' + node.name + '\';return true;" onmouseout="window.status=\'\';return true;" ';
if (this.config.useSelection ((node._hc this.config.folderLinks) || !node._hc))
str += ' onclick="javascript: ' + this.obj + '.s(' + nodeId + ');"';
str += '';
}
else if ((!this.config.folderLinks || !node.url) node._hc node.pid != this.root.id)
str += 'a href="javascript: ' + this.obj + '.o(' + nodeId + ');" class="node"';
str += node.name;
if (node.url || ((!this.config.folderLinks || !node.url) node._hc)) str += '/a';
str += '/div';
if (node._hc) {
str += 'div id="d' + this.obj + nodeId + '" class="clip" style="display:' + ((this.root.id == node.pid || node._io) ? 'block' : 'none') + ';"';
str += this.addNode(node);
str += '/div';
}
this.aIndent.pop();
return str;
};
// Adds the empty and line icons
dTree.prototype.indent = function(node, nodeId) {
var str = '';
if (this.root.id != node.pid) {
for (var n=0; nthis.aIndent.length; n++)
str += 'img src="' + ( (this.aIndent[n] == 1 this.config.useLines) ? this.icon.line : this.icon.empty ) + '" alt="" /';
(node._ls) ? this.aIndent.push(0) : this.aIndent.push(1);
if (node._hc) {
str += 'a href="javascript: ' + this.obj + '.o(' + nodeId + ');"img id="j' + this.obj + nodeId + '" src="';
if (!this.config.useLines) str += (node._io) ? this.icon.nlMinus : this.icon.nlPlus;
else str += ( (node._io) ? ((node._ls this.config.useLines) ? this.icon.minusBottom : this.icon.minus) : ((node._ls this.config.useLines) ? this.icon.plusBottom : this.icon.plus ) );
str += '" alt="" //a';
} else str += 'img src="' + ( (this.config.useLines) ? ((node._ls) ? this.icon.joinBottom : this.icon.join ) : this.icon.empty) + '" alt="" /';
}
return str;
};
// Checks if a node has any children and if it is the last sibling
dTree.prototype.setCS = function(node) {
var lastId;
for (var n=0; nthis.aNodes.length; n++) {
if (this.aNodes[n].pid == node.id) node._hc = true;
if (this.aNodes[n].pid == node.pid) lastId = this.aNodes[n].id;
}
if (lastId==node.id) node._ls = true;
};
// Returns the selected node
dTree.prototype.getSelected = function() {
var sn = this.getCookie('cs' + this.obj);
return (sn) ? sn : null;
};
// Highlights the selected node
dTree.prototype.s = function(id) {
if (!this.config.useSelection) return;
var cn = this.aNodes[id];
if (cn._hc !this.config.folderLinks) return;
if (this.selectedNode != id) {
if (this.selectedNode || this.selectedNode==0) {
eOld = document.getElementById("s" + this.obj + this.selectedNode);
eOld.className = "node";
}
eNew = document.getElementById("s" + this.obj + id);
eNew.className = "nodeSel";
this.selectedNode = id;
if (this.config.useCookies) this.setCookie('cs' + this.obj, cn.id);
}
};
// Toggle Open or close
dTree.prototype.o = function(id) {
var cn = this.aNodes[id];
this.nodeStatus(!cn._io, id, cn._ls);
cn._io = !cn._io;
if (this.config.closeSameLevel) this.closeLevel(cn);
if (this.config.useCookies) this.updateCookie();
};
// Open or close all nodes
dTree.prototype.oAll = function(status) {
for (var n=0; nthis.aNodes.length; n++) {
if (this.aNodes[n]._hc this.aNodes[n].pid != this.root.id) {
this.nodeStatus(status, n, this.aNodes[n]._ls)
this.aNodes[n]._io = status;
}
}
if (this.config.useCookies) this.updateCookie();
};
// Opens the tree to a specific node
dTree.prototype.openTo = function(nId, bSelect, bFirst) {
if (!bFirst) {
for (var n=0; nthis.aNodes.length; n++) {
if (this.aNodes[n].id == nId) {
nId=n;
break;
}
}
}
var cn=this.aNodes[nId];
if (cn.pid==this.root.id || !cn._p) return;
cn._io = true;
cn._is = bSelect;
if (this.completed cn._hc) this.nodeStatus(true, cn._ai, cn._ls);
if (this.completed bSelect) this.s(cn._ai);
else if (bSelect) this._sn=cn._ai;
this.openTo(cn._p._ai, false, true);
};
// Closes all nodes on the same level as certain node
dTree.prototype.closeLevel = function(node) {
for (var n=0; nthis.aNodes.length; n++) {
if (this.aNodes[n].pid == node.pid this.aNodes[n].id != node.id this.aNodes[n]._hc) {
this.nodeStatus(false, n, this.aNodes[n]._ls);
this.aNodes[n]._io = false;
this.closeAllChildren(this.aNodes[n]);
}
}
}
// Closes all children of a node
dTree.prototype.closeAllChildren = function(node) {
for (var n=0; nthis.aNodes.length; n++) {
if (this.aNodes[n].pid == node.id this.aNodes[n]._hc) {
if (this.aNodes[n]._io) this.nodeStatus(false, n, this.aNodes[n]._ls);
this.aNodes[n]._io = false;
this.closeAllChildren(this.aNodes[n]);
}
}
}
// Change the status of a node(open or closed)
dTree.prototype.nodeStatus = function(status, id, bottom) {
eDiv = document.getElementById('d' + this.obj + id);
eJoin = document.getElementById('j' + this.obj + id);
if (this.config.useIcons) {
eIcon = document.getElementById('i' + this.obj + id);
eIcon.src = (status) ? this.aNodes[id].iconOpen : this.aNodes[id].icon;
}
eJoin.src = (this.config.useLines)?
((status)?((bottom)?this.icon.minusBottom:this.icon.minus):((bottom)?this.icon.plusBottom:this.icon.plus)):
((status)?this.icon.nlMinus:this.icon.nlPlus);
eDiv.style.display = (status) ? 'block': 'none';
};
// [Cookie] Clears a cookie
dTree.prototype.clearCookie = function() {
var now = new Date();
var yesterday = new Date(now.getTime() - 1000 * 60 * 60 * 24);
this.setCookie('co'+this.obj, 'cookieValue', yesterday);
this.setCookie('cs'+this.obj, 'cookieValue', yesterday);
};
// [Cookie] Sets value in a cookie
dTree.prototype.setCookie = function(cookieName, cookieValue, expires, path, domain, secure) {
document.cookie =
escape(cookieName) + '=' + escape(cookieValue)
+ (expires ? '; expires=' + expires.toGMTString() : '')
+ (path ? '; path=' + path : '')
+ (domain ? '; domain=' + domain : '')
+ (secure ? '; secure' : '');
};
// [Cookie] Gets a value from a cookie
dTree.prototype.getCookie = function(cookieName) {
var cookieValue = '';
var posName = document.cookie.indexOf(escape(cookieName) + '=');
if (posName != -1) {
var posValue = posName + (escape(cookieName) + '=').length;
var endPos = document.cookie.indexOf(';', posValue);
if (endPos != -1) cookieValue = unescape(document.cookie.substring(posValue, endPos));
else cookieValue = unescape(document.cookie.substring(posValue));
}
return (cookieValue);
};
// [Cookie] Returns ids of open nodes as a string
dTree.prototype.updateCookie = function() {
var str = '';
for (var n=0; nthis.aNodes.length; n++) {
if (this.aNodes[n]._io this.aNodes[n].pid != this.root.id) {
if (str) str += '.';
str += this.aNodes[n].id;
}
}
this.setCookie('co' + this.obj, str);
};
// [Cookie] Checks if a node id is in a cookie
dTree.prototype.isOpen = function(id) {
var aOpen = this.getCookie('co' + this.obj).split('.');
for (var n=0; naOpen.length; n++)
if (aOpen[n] == id) return true;
return false;
};
// If Push and pop is not implemented by the browser
if (!Array.prototype.push) {
Array.prototype.push = function array_push() {
for(var i=0;iarguments.length;i++)
this[this.length]=arguments[i];
return this.length;
}
};
if (!Array.prototype.pop) {
Array.prototype.pop = function array_pop() {
lastElement = this[this.length-1];
this.length = Math.max(this.length-1,0);
return lastElement;
}
};
用JAVA定义一个学生类Student来表示学生信息，学生类中包含成员有学号（id）、姓名（name）、年龄和成绩
如下所示：
public class Student {
private int sNo; //学号
private String name; //姓名
private String sex; //性别
private int yu; //语文
private int shu; //数学
private int wai; //外语
public int getsNo() {
return sNo;
}
public void setsNo(int sNo) {
this.sNo = sNo;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getSex() {
return sex;
}
public void setSex(String sex) {
this.sex = sex;
}
public int getYu() {
return yu;
}
public void setYu(int yu) {
this.yu = yu;
}
public int getShu() {
return shu;
}
public void setShu(int shu) {
this.shu = shu;
}
public int getWai() {
return wai;
}
public void setWai(int wai) {
this.wai = wai;
}
Java是一种可以撰写跨平台应用程序的面向对象的程序设计语言。Java 技术具有卓越的通用性、高效性、平台移植性和安全性，广泛应用于PC、数据中心、游戏控制台、科学超级计算机、移动电话和互联网，同时拥有全球最大的开发者专业社群。
Java 编程语言的风格十分接近C、C++语言。Java是一个纯的面向对象的程序设计语言，它继承了 C++ 语言面向对象技术的核心，Java舍弃了C ++语言中容易引起错误的指针（以引用取代）、运算符重载（operator overloading）、多重继承（以接口取代）等特性，增加了垃圾回收器功能用于回收不再被引用的对象所占据的内存空间，使得程序员不用再为内存管理而担忧。在 Java SE 1.5 版本中，Java 又引入了泛型编程（Generic Programming）、类型安全的枚举、不定长参数和自动装/拆箱等语言特性。
Java由四方面组成：
●Java编程语言，即语法。
●Java文件格式，即各种文件夹、文件的后缀。
●Java虚拟机(JVM)，即处理*.class文件的解释器。
●Java应用程序接口(Java API)
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发布于：2022-12-15，除非注明，否则均为原创文章，转载请注明出处。