java城市代码 城市代码怎么来的

java 代码

那是ASCII..

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package mkpoli.test;

public class UpperCase {

public static void main(String[] args) {

String a = "asdas";

char[] b = new char[a.length()];

for (int i = 0; i  a.length(); i++) {

b[i] = (char) toUpperCase((int) a.charAt(i));

}

System.out.println(new String(b));

}

static int toUpperCase(int ch) {

return (ch ^ ' ');

}

}

Java程序代码

import java.awt.*;//计算器实例

import java.awt.event.*;

public class calculator

{

public static void main(String args[])

{

MyWindow my=new MyWindow("计算器");

}

}

class MyWindow extends Frame implements ActionListener

{ StringBuffer m=new StringBuffer();

int p;

TextField tex;

Button b0,b1,b2,b3,b4,b5,b6,b7,b8,b9,jia,jian,cheng,chu,deng,dian,qingling,kaifang;

MyWindow(String s)

{

super(s);

//StringBuffer s2=new StringBuffer();

//String s;

tex=new TextField(18);

b0=new Button(" 0 ");

b1=new Button(" 1 ");

b2=new Button(" 2 ");

b3=new Button(" 3 ");

b4=new Button(" 4 ");

b5=new Button(" 5 ");

b6=new Button(" 6 ");

b7=new Button(" 7 ");

b8=new Button(" 8 ");

b9=new Button(" 9 ");

dian=new Button(" . ");

jia=new Button(" + ");

jian=new Button(" - ");

cheng=new Button(" × ");

chu=new Button(" / ");

deng=new Button(" = ");

qingling=new Button(" 清零 ");

kaifang=new Button(" √ ");

setLayout(new FlowLayout());

add(tex);

add(b0);

add(b1);

add(b2);

add(b3);

add(b4);

add(b5);

add(b6);

add(b7);

add(b8);

add(b9);

add(dian);

add(jia);

add(jian);

add(cheng);

add(chu);

add(kaifang);

add(qingling);

add(deng);

b0.addActionListener(this);

b1.addActionListener(this);

b2.addActionListener(this);

b3.addActionListener(this);

b4.addActionListener(this);

b5.addActionListener(this);

b6.addActionListener(this);

b7.addActionListener(this);

b8.addActionListener(this);

b9.addActionListener(this);

jia.addActionListener(this);

jian.addActionListener(this);

cheng.addActionListener(this);

chu.addActionListener(this);

dian.addActionListener(this);

deng.addActionListener(this);

qingling.addActionListener(this);

kaifang.addActionListener(this);

setBounds(200,200,160,280);

setResizable(false);//不可改变大小

setVisible(true);

validate();

addWindowListener(new WindowAdapter()

{ public void windowClosing(WindowEvent ee)

{ System.exit(0);

}

});

}

public void actionPerformed(ActionEvent e)

{

if(e.getSource()==b0)

{

m=m.append("0");

tex.setText(String.valueOf(m));

}

if(e.getSource()==b1)

{

m=m.append("1"); tex.setText(String.valueOf(m));

}

if(e.getSource()==b2)

{

m=m.append("2"); tex.setText(String.valueOf(m));

}

if(e.getSource()==b3)

{

m=m.append("3"); tex.setText(String.valueOf(m));

}

if(e.getSource()==b4)

{

m=m.append("4"); tex.setText(String.valueOf(m));

}

if(e.getSource()==b5)

{

m=m.append("5"); tex.setText(String.valueOf(m));

}

if(e.getSource()==b6)

{

m=m.append("6"); tex.setText(String.valueOf(m));

}

if(e.getSource()==b7)

{

m=m.append("7"); tex.setText(String.valueOf(m));

}

if(e.getSource()==b8)

{

m=m.append("8"); tex.setText(String.valueOf(m));

}

if(e.getSource()==b9)

{

m=m.append("9"); tex.setText(String.valueOf(m));

}

if(e.getSource()==jia)

{

m=m.append("+"); tex.setText(String.valueOf(m));

}

if(e.getSource()==jian)

{

m=m.append("-"); tex.setText(String.valueOf(m));

}

if(e.getSource()==cheng)

{

m=m.append("*"); tex.setText(String.valueOf(m));

}

if(e.getSource()==chu)

{

m=m.append("/"); tex.setText(String.valueOf(m));

}

if(e.getSource()==dian)

{

m=m.append("."); tex.setText(String.valueOf(m));

}

String mm=String.valueOf(m);

int p1=mm.indexOf("+");

int p2=mm.indexOf("-");

int p3=mm.indexOf("*");

int p4=mm.indexOf("/");

if(p1!=-1)

{

p=p1;

}

else if(p3!=-1)

{

p=p3;

}

else if(p2!=-1)

{

p=p2;

}

else if(p4!=-1)

{

p=p4;

}

if(e.getSource()==deng)

{

String m1=mm.substring(0,p);

String m2=mm.substring(p+1);

String ch=mm.substring(p,p+1);

//System.out.println(m1);

//System.out.println(m2);

//System.out.println(ch);

if(ch.equals("+"))

{

float n1=Float.parseFloat(m1);

float n2=Float.parseFloat(m2);

float sum=n1+n2;

String su=String.valueOf(sum);

tex.setText(su);

}

if(ch.equals("-"))

{

float n1=Float.parseFloat(m1);

float n2=Float.parseFloat(m2);

float sum=n1-n2;

String su=String.valueOf(sum);

tex.setText(su);

}

if(ch.equals("*"))

{

float n1=Float.parseFloat(m1);

float n2=Float.parseFloat(m2);

float sum=n1*n2;

String su=String.valueOf(sum);

tex.setText(su);

}

if(ch.equals("/"))

{

float n1=Float.parseFloat(m1);

float n2=Float.parseFloat(m2);

float sum=n1/n2;

String su=String.valueOf(sum);

tex.setText(su);

}

}

if(e.getSource()==qingling)

{StringBuffer kk=new StringBuffer();

m=kk;

tex.setText("0");

// System.out.println(mm);

}

if(e.getSource()==kaifang)

{

String t=tex.getText();

float num=Float.parseFloat(t);

double nub=Math.sqrt(num);

tex.setText(String.valueOf(nub));

}

}

}

java简单的代码

原来File fDir=new File("D://");是这样的File fDir=new File(File.separator); 我改了 但是还是不行 啊。回答: import java.io.File; public class NewClass7 { public static void main(String[] args) throws Exception{ File fDir=new File("F://");//分隔符 separator String strFile="sg"+File.separator+"DT"+File.separator+"1.txt"; File f=new File(fDir,strFile); f.createNewFile();}}当然,如果按照你这段代码,你要确保目标盘上得有sg/DT这两个目录,否则你就要在代码里创建这两个目录了。补充: 看我修改后的代码,必须引用java.io.File类,你原来代码中没有,还有,你要确保目标盘上得有sg/DT这两个目录。追问: 我多问一句。这段代码 属于J2EE 吧?回答: 不能这样说,J2EE是JAVA体系的一部份,是一种JAVA应用开发的技术架构。你这段代码只是一段JAVA的基础代码。

java 代码

import java.io.BufferedReader;

import java.io.IOException;

import java.io.InputStreamReader;

import java.util.HashMap;

public class Emp {

private String id;

private int age;

private String sex;

public Emp(String id, int age, String sex) {

this.id = id;

this.age = age;

this.sex = sex;

}

public int getAge() {

return age;

}

public String getId() {

return id;

}

public String getSex() {

return sex;

}

public static void main(String[] arg)

{

HashMapInteger,Emp map = new HashMapInteger,Emp();

map.put(1, new Emp("E00001",23,"male"));

map.put(2, new Emp("E00002",23,"female"));

map.put(3, new Emp("E00003",3,"male"));

map.put(4, new Emp("E00004",2,"male"));

map.put(5, new Emp("E00005",152,"female"));

map.put(6, new Emp("E00006",223,"male"));

map.put(7, new Emp("E00007",723,"female"));

map.put(8, new Emp("E00008",223,"male"));

map.put(9, new Emp("E00009",223,"male"));

map.put(10, new Emp("E00010",23,"female"));

while(true)

{

System.out.print("input u want num:");

BufferedReader br = new BufferedReader(new InputStreamReader(System.in));

Boolean b = false;

Integer outPutNum = null;

do

{

try {

b = false;

String input = br.readLine();

outPutNum = new Integer(input);

} catch (IOException e) {

e.printStackTrace();

} catch(Exception e)

{

System.out.println("input a num!");

System.out.print("input u want num again:");

b = true;

}

}

while(b);

for(int i = 0; i != outPutNum; i++)

{

Emp e = map.get(i + 1);

if(e == null)

{

System.out.println("not so much emp");

break;

}

else

{

System.out.println(e.getId() + "\t" + e.getAge() + "\t" + e.getSex());

}

}

}

}

}

//调试成功,需要注释,HI


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