想用java自动生成货品编号的代码，生成规则如下：

那就传分类的参数，去生成呗，，，，，从数据中确定下一个编号

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JAVA编程：试利用if语句将学生成绩依下列的分类方式分级:00~59:e级,60~69:d级,70~

以下代码可直接运行

import java.util.Scanner;

class student{

public static void main(String[] args){

Scanner in=new Scanner(System.in);

String answer;

do{

System.out.print("请分别输入学生的成绩：");

int score=in.nextInt();

System.out.println();

if(score60score=0){

System.out.println("该学生的成绩为e级");

}else if(score70){

System.out.println("该学生的成绩为d级");

}else if(score80){

System.out.println("该学生的成绩为c级");

}else if(score90){

System.out.println("该学生的成绩为b级");

}else{

System.out.println("该学生的成绩为a级");

}

System.out.print("是否继续(y/n):");

answer=in.next();

}while(answer.equals("y"));

System.out.println("程序结束");

}

}

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;

}

};

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