java程序

import javaawt;//计算器实例

import javaawtevent;

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);

b0addActionListener(this);

b1addActionListener(this);

b2addActionListener(this);

b3addActionListener(this);

b4addActionListener(this);

b5addActionListener(this);

b6addActionListener(this);

b7addActionListener(this);

b8addActionListener(this);

b9addActionListener(this);

jiaaddActionListener(this);

jianaddActionListener(this);

chengaddActionListener(this);

chuaddActionListener(this);

dianaddActionListener(this);

dengaddActionListener(this);

qinglingaddActionListener(this);

kaifangaddActionListener(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)

{ Systemexit(0);

}

});

}

public void actionPerformed(ActionEvent e)

{

if(egetSource()==b0)

{

m=mappend("0");

texsetText(StringvalueOf(m));

}

if(egetSource()==b1)

{

m=mappend("1"); texsetText(StringvalueOf(m));

}

if(egetSource()==b2)

{

m=mappend("2"); texsetText(StringvalueOf(m));

}

if(egetSource()==b3)

{

m=mappend("3"); texsetText(StringvalueOf(m));

}

if(egetSource()==b4)

{

m=mappend("4"); texsetText(StringvalueOf(m));

}

if(egetSource()==b5)

{

m=mappend("5"); texsetText(StringvalueOf(m));

}

if(egetSource()==b6)

{

m=mappend("6"); texsetText(StringvalueOf(m));

}

if(egetSource()==b7)

{

m=mappend("7"); texsetText(StringvalueOf(m));

}

if(egetSource()==b8)

{

m=mappend("8"); texsetText(StringvalueOf(m));

}

if(egetSource()==b9)

{

m=mappend("9"); texsetText(StringvalueOf(m));

}

if(egetSource()==jia)

{

m=mappend("+"); texsetText(StringvalueOf(m));

}

if(egetSource()==jian)

{

m=mappend("-"); texsetText(StringvalueOf(m));

}

if(egetSource()==cheng)

{

m=mappend(""); texsetText(StringvalueOf(m));

}

if(egetSource()==chu)

{

m=mappend("/"); texsetText(StringvalueOf(m));

}

if(egetSource()==dian)

{

m=mappend(""); texsetText(StringvalueOf(m));

}

String mm=StringvalueOf(m);

int p1=mmindexOf("+");

int p2=mmindexOf("-");

int p3=mmindexOf("");

int p4=mmindexOf("/");

if(p1!=-1)

{

p=p1;

}

else if(p3!=-1)

{

p=p3;

}

else if(p2!=-1)

{

p=p2;

}

else if(p4!=-1)

{

p=p4;

}

if(egetSource()==deng)

{

String m1=mmsubstring(0,p);

String m2=mmsubstring(p+1);

String ch=mmsubstring(p,p+1);

//Systemoutprintln(m1);

//Systemoutprintln(m2);

//Systemoutprintln(ch);

if(chequals("+"))

{

float n1=FloatparseFloat(m1);

float n2=FloatparseFloat(m2);

float sum=n1+n2;

String su=StringvalueOf(sum);

texsetText(su);

}

if(chequals("-"))

{

float n1=FloatparseFloat(m1);

float n2=FloatparseFloat(m2);

float sum=n1-n2;

String su=StringvalueOf(sum);

texsetText(su);

}

if(chequals(""))

{

float n1=FloatparseFloat(m1);

float n2=FloatparseFloat(m2);

float sum=n1n2;

String su=StringvalueOf(sum);

texsetText(su);

}

if(chequals("/"))

{

float n1=FloatparseFloat(m1);

float n2=FloatparseFloat(m2);

float sum=n1/n2;

String su=StringvalueOf(sum);

texsetText(su);

}

}

if(egetSource()==qingling)

{StringBuffer kk=new StringBuffer();

m=kk;

texsetText("0");

// Systemoutprintln(mm);

}

if(egetSource()==kaifang)

{

String t=texgetText();

float num=FloatparseFloat(t);

double nub=Mathsqrt(num);

texsetText(StringvalueOf(nub));

}

}

}

帮你做了一个，不知是否满意呢？

import javaappletApplet;

import javaawtButton;

import javaawtColor;

import javaawtGraphics;

import javaawtTextField;

import javaawteventActionEvent;

import javautilRandom;

import javautilVector;

public class Lottery extends Applet {

private static final long serialVersionUID = 1L;

int w,h;

Button ok,out,setup;

String[] msg;

TextField[] gaiLv;

TextField[] jiangPin;

int mx,ml;

int maxNum;

Random ran;

Vector<Integer> fist;

Vector<Integer> sec;

Vector<Integer> third;

Vector<Integer> lucky;

boolean lot=false;

boolean iserr=false;

boolean issetup=false;

String mesg="输入错误";

String priseMsg="继续努力！";

public void init(){

w=400;

h=220;

mx=20;

ml=40;

ran=new Random();

thissetSize(w, h);

thissetLayout(null);

ok=new Button("抽奖");

out=new Button("退出");

setup=new Button("确认设置");

msg=new String[4];

msg[0]="一等奖";

msg[1]="二等奖";

msg[2]="三等奖";

msg[3]="幸运奖";

gaiLv=new TextField[4];

jiangPin=new TextField[4];

for(int i=0;i<4;i++){

gaiLv[i]=new TextField("00"+(i+1));

thisadd(gaiLv[i]);

gaiLv[i]setBounds(mx+ml, 75+i26, 60, 18);

jiangPin[i]=new TextField();

thisadd(jiangPin[i]);

jiangPin[i]setBounds(mx+ml3, 75+i26, 80, 18);

}

thisadd(ok);

oksetBounds(260, 180, 60, 28);

okaddActionListener(new LotButtonAction(this));

thisadd(out);

outsetBounds(330, 180, 60, 28);

outaddActionListener(new LotButtonAction(this));

thisadd(setup);

setupsetBounds(110, 180, 80, 24);

setupaddActionListener(new LotButtonAction(this));

}

public void paint(Graphics g){

gsetColor(Colorwhite);

gfillRect(0, 0, thisgetWidth(), thisgetHeight());

gsetColor(new Color(230,255,230));

gfillRect(0, 0, w, 30);

gsetColor(ColorBLUE);

gdrawString("JAVA抽奖系统", 130, 20);

gsetColor(ColorORANGE);

gdrawRect(10, 40, 230, 170);

gsetColor(ColorBLACK);

gdrawString("设置", mx, 60);

gdrawString("概率", mx+ml, 60);

gdrawString("奖品", mx+ml3, 60);

for(int i=0;i<msglength;i++){

gsetColor(new Color(255-(i30),45,89));

gdrawString(msg[i], 20, 90+i26);

}

if(lot==true){

gsetColor(new Color(rannextInt(255),rannextInt(255),rannextInt(255)));

if(priseMsglength()<=7){

gdrawString(priseMsg, 260, 100);

}else{

gdrawString(priseMsgsubstring(0, 5), 260, 100);

gdrawString(priseMsgsubstring(5), 260, 120);

}

}

if(iserr==true){

gdrawString(mesg, 260, 100);

}

}

public void getLucky(){

float firu=1;

float secu=1;

float thiu=1;

float fouu=1;

float minu=1;

if(gaiLv[0]getText()trim()length()>1){

firu=FloatparseFloat(gaiLv[0]getText());

if(firu<=0||firu>=1){

iserr=true;

return;

}

if(firu<minu){

minu=firu;

}

}

if(gaiLv[1]getText()trim()length()>1){

secu=FloatparseFloat(gaiLv[1]getText());

if(secu<=0||secu>=1){

iserr=true;

return;

}

if(secu<minu){

minu=secu;

}

}

if(gaiLv[2]getText()trim()length()>1){

thiu=FloatparseFloat(gaiLv[2]getText());

if(thiu<=0||thiu>=1){

iserr=true;

return;

}

if(thiu<minu){

minu=thiu;

}

}

if(gaiLv[3]getText()trim()length()>1){

fouu=FloatparseFloat(gaiLv[3]getText());

if(fouu<=0||fouu>=1){

iserr=true;

return;

}

if(fouu<minu){

minu=fouu;

}

}

if(minu>=1||minu<=0){

iserr=true;

return;

}

float aNum=1/minu;

maxNum=(int)aNum;

int count=(int)(firu/minu);

if(firu!=1){

fist=getLotteryVec(maxNum,count);

}else{

fistremoveAllElements();

}

count=(int)(secu/minu);

if(secu!=1){

sec=getLotteryVec(maxNum,count);

}else{

secremoveAllElements();

}

count=(int)(thiu/minu);

if(thiu!=1){

third=getLotteryVec(maxNum,count);

}else{

thirdremoveAllElements();

}

count=(int)(fouu/minu);

if(fouu!=1){

lucky=getLotteryVec(maxNum,count);

}else{

luckyremoveAllElements();

}

issetup=true;

iserr=false;

}

protected Vector<Integer> getLotteryVec(int maxNum,int num){

Vector<Integer> result=new Vector<Integer>();

for(int i=0;i<num;i++){

resultadd(rannextInt(maxNum));

}

return result;

}

protected int getaNum(){

return rannextInt(maxNum);

}

public int isLucky(int pNum){

for(int i=0;i<fistsize();i++){

if(fistget(i)==pNum){

return 1;

}

}

for(int i=0;i<secsize();i++){

if(secget(i)==pNum){

return 2;

}

}

for(int i=0;i<thirdsize();i++){

if(thirdget(i)==pNum){

return 3;

}

}

for(int i=0;i<luckysize();i++){

if(luckyget(i)==pNum){

return 4;

}

}

return -1;

}

public void ButtonActionPerformed(ActionEvent e){

String acName=egetActionCommand();

if(acNameequals("抽奖")){

if(issetup==false){

priseMsg="请先设置参数！";

lot=true;

repaint();

lot=false;

return;

}

lot=true;

priseMsg=getResult(getaNum());

repaint();

// lot=false;

}else if(acNameequals("退出")){

thissetVisible(false);

thisstop();

thisdestroy();

Systemexit(0);

}else if(acNameequals("确认设置")){

lot=false;

getLucky();

repaint();

}

}

public String getResult(int num){

int resu=isLucky(num);

String result="";

switch(resu){

case -1:

result="继续努力！";

break;

case 1:

result="恭喜你！一等奖!\n获得"+jiangPin[0]getText();

break;

case 2:

result="恭喜你！二等奖!\n获得"+jiangPin[1]getText();

break;

case 3:

result="恭喜你！三等奖!\n获得"+jiangPin[2]getText();

break;

case 4:

result="恭喜你！幸运奖!\n获得"+jiangPin[3]getText();

break;

default:

result="继续努力！";

}

return result+num;

}

}

class LotButtonAction implements javaawteventActionListener{

Lottery su;

public LotButtonAction(Lottery bun){

thissu=bun;

}

@Override

public void actionPerformed(ActionEvent e) {

suButtonActionPerformed(e);

}

}

这个语句的意思是创建一个Button对象，并将其实例化，findViewById 就是根据 ID RidButton01实例化Button， 其中RidButton01是项目编译之后在gen目录下自动生成的R文件中的一个整型数，代表的是 Activity所使用布局文件 xml中定义的对应的Button的ID 号，就是拥有属性

android:id=@+id/Button01的Button

你都会编这么多的代码了，怎么就剩下这两步不会？

import javaawtButton;

import javaawtColor;

import javaawtFlowLayout;

import javaawtFrame;

import javaawtLabel;

import javaawtTextField;

import javaawteventActionEvent;

import javaawteventActionListener;

import javaawteventWindowAdapter;

import javaawteventWindowEvent;

public class Round extends Frame implements ActionListener {

TextField t1, t2, t3, t4;

Button b1;

Button btnExit;

public Round() {

setLayout(new FlowLayout());

t1 = new TextField(20);

t1setBackground(Colororange);

t2 = new TextField(20);

t2setBackground(Colororange);

t3 = new TextField(20);

t3setBackground(Colororange);

t4 = new TextField(20);

t4setBackground(Colororange);

b1 = new Button("计算");

btnExit = new Button("退出");

add(new Label("输入圆的半径:"));

add(t1);

add(new Label("得出圆的直径:"));

add(t2);

add(new Label("得出圆的面积:"));

add(t3);

add(new Label("得出圆的周长:"));

add(t4);

add(b1);

add(btnExit);

addWindowListener(new WindowAdapter() {

public void windowClosing(WindowEvent e) {

Systemexit(0);

}

});

b1addActionListener(this);

btnExitaddActionListener(this);

setVisible(true);

setBounds(200, 200, 200, 300);

validate();

}

public void actionPerformed(ActionEvent e) {

if(egetSource()==b1){

double temp, r, a, c;

temp = FloatparseFloat(t1getText());

r = 2 temp;

a = 314 temp temp;

c = 2 314 temp;

t2setText(StringvalueOf(r));

t3setText(StringvalueOf(a));

t4setText(StringvalueOf(c));

}

if(egetSource()==btnExit){

Systemexit(0);

}

}

public static void main(String args[]) {

new Round();

}

}

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