簡易計算器java
㈠ 用java實現一個簡單的計算器。
說實在的，你寫的這個計算器不怎麼樣。特別是布局。
我給你一個很簡單的吧。你自己學習一下。。
import java.awt.*;
import java.awt.event.*;
/**
*
* @author zzj
*
*/
public class Jisuanqi extends WindowAdapter {
Panel p1 = new Panel();
Panel p2 = new Panel();
Panel p3 = new Panel();
TextField txt;
private Button[] b = new Button[17];
private String ss[] = { "7", "8", "9", "+", "4", "5", "6", "-", "1", "2",
"3", "*", "清空", "0", "=", "/", "關閉" };
static double a;
static String s, str;//定義變數 創建對像
public static void main(String args[]) {
(new Jisuanqi()).frame();
}
public void frame() {
Frame fm = new Frame("簡單計算器");
for (int i = 0; i <= 16; i++) {
b[i] = new Button(ss[i]);
}
for (int i = 0; i <= 15; i++) {
p2.add(b[i]);
} //創建按鈕 並添加到P2
b[16].setBackground(Color.yellow);
txt = new TextField(15);
txt.setEditable(false);
for (int i = 0; i <= 16; i++) {
b[i].addActionListener(new buttonlistener());//添加監聽器
}
b[16].addActionListener(new close());
fm.addWindowListener(this);
fm.setBackground(Color.red);
p1.setLayout(new BorderLayout());
p1.add(txt, "North");
p2.setLayout(new GridLayout(4, 4));
p3.setLayout(new BorderLayout());
p3.add(b[16]);
fm.add(p1, "North");
fm.add(p2, "Center");
fm.add(p3, "South");
fm.pack();
fm.setVisible(true);//都是些窗中設置 添加相關組件和監聽器
}
public void windowClosing(WindowEvent e) {
System.exit(0);//退出系統
}
class buttonlistener implements ActionListener {//編寫監聽器事件 通過按鍵得出給果
public void actionPerformed(ActionEvent e) {
Button btn = (Button) e.getSource();
if (btn.getLabel() == "=") {
jisuan();
str = String.valueOf(a);
txt.setText(str);
s = "";
} else if (btn.getLabel() == "+") {
jisuan();
txt.setText("");
s = "+";
} else if (btn.getLabel() == "-") {
jisuan();
txt.setText("");
s = "-";
} else if (btn.getLabel() == "/") {
jisuan();
txt.setText("");
s = "/";
} else if (btn.getLabel() == "*") {
jisuan();
txt.setText("");
s = "*";
} else {
txt.setText(txt.getText() + btn.getLabel());
if (btn.getLabel() == "清空")
txt.setText("");
}
}
public void jisuan() {//編寫具體計算方法
if (s == "+")
a += Double.parseDouble(txt.getText());
else if (s == "-")
a -= Double.parseDouble(txt.getText());
else if (s == "*")
a *= Double.parseDouble(txt.getText());
else if (s == "/")
a /= Double.parseDouble(txt.getText());
else
a = Double.parseDouble(txt.getText());
}
}
}
class close implements ActionListener {//退出
public void actionPerformed(ActionEvent e) {
System.exit(0);
}
}
㈡ JAVA 編寫計算器 要代碼最簡單的
學java的時候自己編的，很簡單，能夠連續輸入計算式後進行計算
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.FlowLayout;
import java.awt.Font;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.text.NumberFormat;
import java.util.ArrayList;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JTextField;
/**簡易計算器，能夠進行簡單的計算
*
* @see 2008.12.9
*/
public class CalculatorA
implements ActionListener{
private JFrame frame;
private JTextField field;
private JButton[] allButtons;
private JButton clearButton;
// private JButton backButton;
String result="";//保存結果
StringBuilder sb = new StringBuilder();//保存要進行的計算式
int x = 0; //用來判斷上一次的事件類型
String str = "123+456-789*0.=/";
ArrayList<String> arrayList = new ArrayList<String>();//保存計算式，通過方法進行運算
public CalculatorA(){
frame = new JFrame("我的計算器v1.1");
frame.setLocation(300,300);
field = new JTextField(25);
allButtons = new JButton[16];
for(int i=0;i<allButtons.length;i++){
allButtons[i]= new JButton(str.substring(i,i+1));
}
clearButton = new JButton("CLEAR");
// backButton = new JButton("<——");
init();
setFondAndColor();
addEventHander();
}
public void init(){
frame.setLayout(new BorderLayout());
JPanel northPanel = new JPanel();
JPanel centerPanel = new JPanel();
JPanel southPanel = new JPanel();
northPanel.setLayout(new FlowLayout());
centerPanel.setLayout(new GridLayout(4,4));
southPanel.setLayout(new FlowLayout());
northPanel.add(field);
for(int i=0;i<allButtons.length;i++){
centerPanel.add(allButtons[i]);
}
southPanel.add(clearButton);
//southPanel.add(backButton);
frame.add(northPanel,BorderLayout.NORTH);
frame.add(centerPanel,BorderLayout.CENTER);
frame.add(southPanel,BorderLayout.SOUTH);
}
//設置輸入字體
public void setFondAndColor(){
field.setFont(new Font("宋體",Font.BOLD,24));
field.setBackground(new Color(100,200,200));
field.setForeground(Color.RED);
//設置字體從右起始
field.setHorizontalAlignment(JTextField.RIGHT);
}
public void showMi(){
frame.pack();
frame.setResizable(false);
frame.setVisible(true);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
public void addEventHander(){
for(int i=0;i<allButtons.length;i++){
allButtons[i].addActionListener(this);
}
clearButton.addActionListener(this);
// backButton.addActionListener(this);
}
@Override
public void actionPerformed(ActionEvent e) {
String str = e.getActionCommand();//取得當前事件返回的值
if("0123456789.".indexOf(str)!=-1){
if(x == 0){ //當x為0時表示還沒有進行輸入
result=str;
sb.append(str);
field.setText(str);
x = 1;
}
else if(x == 1){
result = result +str;
sb.append(str);
field.setText(result);
x = 1;
}
else if(x == 2){
sb.delete(0,sb.length());
result = result+str;
sb.append(str);
field.setText(result);
x = 1;
}
else if(x == 3){
result = str;
sb.delete(0,sb.length());
arrayList.clear();
field.setText(str);
sb.append(str);
field.setText(str);
x = 1;
}
else if(x == 4){
result ="";
sb.delete(0,sb.length());
arrayList.clear();
result = str;
sb.append(str);
field.setText(str);
x = 1;
}
else{
result = result +str;
sb.append(str);
field.setText(result);
x = 1;
}
}
else if("+*-/".indexOf(str)!=-1){
if(x == 0){
field.setText("");
x = 2;
}
else if(x == 1){
result = result + str;
arrayList.add(sb.toString());
arrayList.add(str);
sb.append(str);
field.setText(result);
x = 2;
}
else if(x == 2){
x = 2;
}
else if(x == 3){
field.setText(result+str);
arrayList.add(result);
arrayList.add(str);
result = result+str;
x = 2;
}
else if(x == 4){
result ="";
sb.delete(0,sb.length());
arrayList.clear();
x = 2;
}
else{
field.setText(result+str);
arrayList.add(result);
arrayList.add(str);
result = result+str;
x = 2;
}
}
else if("=".equals(str)){
if(x == 0){
field.setText("0");
arrayList.clear();
result = "0";
x = 3;
}
else if(x == 1){
try{
arrayList.add(sb.toString());
arrayList = getResult(arrayList);
result = arrayList.get(0);
field.setText(result);
arrayList.clear();
x = 3;
}catch(Exception e1){
field.setText("數據格式異常");
x = 0;
}
}
else if(x == 2){
field.setText("數據格式錯誤.....");
arrayList.clear();
x = 0;
}
else if(x == 3){
field.setText(result);
x = 3;
}
else if(x == 4){
result ="";
sb.delete(0,sb.length());
arrayList.clear();
x = 3;
}
else {
try{
arrayList.add(sb.toString());
arrayList = getResult(arrayList);
result = arrayList.get(0);
field.setText(result);
arrayList.clear();
x = 3;
}catch(Exception e1){
field.setText("數據格式異常");
x = 0;
}
}
}
else if("CLEAR".equals(str)){
arrayList.clear();
field.setText("0");
arrayList.add("0");
x = 4;
}
else{
if(result.length()>1){
result = result.substring(0,result.length()-1);
if(sb.length()>0){
sb.delete(sb.length()-1,sb.length());
}
else {
sb.delete(0,1);
}
field.setText(result);
x = 5;
}
else{
result = "";
sb.delete(0,sb.length());
arrayList.clear();
field.setText("0");
x = 0;
}
}
}
public static ArrayList<String> getResult(ArrayList<String> list){
String res = null;
String[] s = {"/","*","-","+"};
int i=0;
if(list.size()>1){
for(;i<s.length;){
if(s[i].equals("/")){
for(int j=0;j<list.size();j++){
if(list.get(j).equals(s[i])){
res = Double.toString(Double.parseDouble(list.get(j-1))/Double.parseDouble(list.get(j+1)));
//本地的數據格式
NumberFormat nf = NumberFormat.getInstance();
res = nf.format(Double.parseDouble(res));
res = getChange(res);
list.set(j-1,res);
list.remove(j);
list.remove(j);
getResult(list);
}
}
i++;
}
else if(s[i].equals("*")){
for(int j=0;j<list.size();j++){
if(list.get(j).equals(s[i])){
res = Double.toString(Double.parseDouble(list.get(j-1))*Double.parseDouble(list.get(j+1)));
NumberFormat nf = NumberFormat.getInstance();
res = nf.format(Double.parseDouble(res));
res = getChange(res);
list.set(j-1,res);
list.remove(j);
list.remove(j);
getResult(list);
}
}
i++;
}
else if(s[i].equals("-")){
for(int j=0;j<list.size();j++){
if(list.get(j).equals(s[i])){
res = Double.toString(Double.parseDouble(list.get(j-1))-Double.parseDouble(list.get(j+1)));
NumberFormat nf = NumberFormat.getNumberInstance();
res = nf.format(Double.parseDouble(res));
res = getChange(res);
list.set(j-1,res);
list.remove(j);
list.remove(j);
getResult(list);
}
}
i++;
}
else {
for(int j=0;j<list.size();j++){
if(list.get(j).equals(s[i])){
res = Double.toString(Double.parseDouble(list.get(j-1))+Double.parseDouble(list.get(j+1)));
NumberFormat nf = NumberFormat.getInstance();
res = nf.format(Double.parseDouble(res));
res = getChange(res);
list.set(j-1,res);
list.remove(j);
list.remove(j);
getResult(list);
}
}
i++;
}
}
}
return list;
}
//對數字字元串進行排除不必要符號
public static String getChange(String res){
String s_temp = "";
char[] c = new char[res.length()];
for(int k=0;k<c.length;k++){
c[k] = res.charAt(k);
}
for(int k=0;k<c.length;k++){
if((c[k]>= '0' && c[k]<= '9')|| c[k] == '.'){
s_temp += c[k];
}
}
return s_temp;
}
public static void main(String[] args){
new CalculatorA().showMi();
}
}
㈢ 用java程序設計一簡易計算器：可以實現+，—，*，/，%和三角運算。急用！！！
用樹的方式儲存運算 不過我只有Pascal的
而且沒茄拍有，%和三角運算，你自裂蠢己顫源羨稍微改進一下
program suanshi(input,output);
type
cao=record
b:boolean;
d:real;
end;
{
[42,43,44,45,46,47]
[ * + , - . / ]
[ 2 1 99 1 99 2 ]}
const
degree:array[42..47] of integer=(2,1,99,1,99,2);
var
s:string;
a:array[1..1024] of cao;
result1:real;
procere init(s1:string;k:integer);
var
i,j,lowdegree,where,code:integer;
s2,s3:string;
begin
i:=0;
j:=0;
lowdegree:=100;
if (s1[1]='(') and (s1[length(s1)]=')') then
begin
delete(s1,1,1);
delete(s1,length(s1),1);
end;
repeat
inc(i);
if s1[i]='(' then
repeat
if s1[i]='(' then inc(j);
if s1[i]=')' then dec(j);
inc(i);
until j=0;
if not(i>=length(s1)) then
begin
if (ord(s1[i])<48) and (degree[ord(s1[i])]<=lowdegree) then
begin
lowdegree:=degree[ord(s1[i])];
where:=i;
end;
end;
until i>=length(s1);
if lowdegree=100 then
begin
a[k].b:=false;
val(s1,a[k].d,code);
exit;
end;
a[k].b:=true;
a[k].d:=ord(s1[where]);
s2:=(s1,1,where-1);
s3:=(s1,where+1,length(s1)-where);
init(s2,k*2);
init(s3,k*2+1);
end;
function figure(k:integer):real;
var
n:integer;
begin
if not(a[k].b) then
begin
figure:=a[k].d;
exit;
end;
n:=trunc(a[k].d);
case n of
42:figure:=figure(k*2)*figure(k*2+1);
43:figure:=figure(k*2)+figure(k*2+1);
45:figure:=figure(k*2)-figure(k*2+1);
47:figure:=figure(k*2)/figure(k*2+1);
end;
a[k].b:=false;
end;
begin
read(s);
init(s,1);
result1:=figure(1);
writeln(s,'=',result1:0:0);
end.
㈣ 用JAVA編寫一個計算器
importjava.awt.BorderLayout;
importjava.awt.Color;
importjava.awt.GridLayout;
importjava.awt.event.ActionEvent;
importjava.awt.event.ActionListener;
importjavax.swing.ImageIcon;
importjavax.swing.JButton;
importjavax.swing.JFrame;
importjavax.swing.JPanel;
importjavax.swing.JTextField;
importjavax.swing.SwingConstants;
{
/**
*
*/
=1L;
Resultresult=newResult();//定義text的面板
Number_Keynumber_key=newNumber_Key();//定義按鈕面板
//當點擊按鈕+、-、*、/時，com=true
booleancom=false;
//當i=0時說明是我們第一次輸入，字元串text不會累加
inti=0;
//存放text的內容
Stringtext="";
//存放點擊按鈕+、-、*、/之前的數值
doubledefbutton=0;
//+、-、*、/的代號分別為1，2，3，4
intsymbol=0;
//構造函數
Jisuanqi(){
super("WangJiao");//設定標題
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);//設定關閉窗體時退出程序
JPanelpane=newJPanel();//定義主面板
pane.setLayout(newBorderLayout());
setBounds(380,220,30,80);//前兩個參數是在屏幕上顯示的坐標，後兩個是大小
//替換圖標
ImageIconicon=newImageIcon("F:1.GIF");
//Jisuanqi.class.getResource("APPLE.GIF")
//);
setIconImage(icon.getImage());
pane.add(result,BorderLayout.NORTH);
pane.add(number_key,BorderLayout.CENTER);
pane.add(number_key.equal,BorderLayout.SOUTH);
number_key.one.addActionListener(this);//對1按鈕添加監聽事件
number_key.two.addActionListener(this);//對2按鈕添加監聽事件
number_key.three.addActionListener(this);//對3按鈕添加監聽事件
number_key.four.addActionListener(this);//對4按鈕添加監聽事件
number_key.five.addActionListener(this);//對5按鈕添加監聽事件
number_key.six.addActionListener(this);//對6按鈕添加監聽事件
number_key.seven.addActionListener(this);//對7按鈕添加監聽事件
number_key.eight.addActionListener(this);//對8按鈕添加監聽事件
number_key.nine.addActionListener(this);//對9按鈕添加監聽事件
number_key.zero.addActionListener(this);//對0按鈕添加監聽事件
number_key.ce.addActionListener(this);//對置零按鈕添加監聽事件
number_key.plus.addActionListener(this);//對+按鈕添加監聽事件
number_key.equal.addActionListener(this);//對=按鈕添加監聽事件
number_key.sub.addActionListener(this);//對-按鈕添加監聽事件
number_key.mul.addActionListener(this);//對*按鈕添加監聽事件
number_key.div.addActionListener(this);//對/按鈕添加監聽事件
number_key.point.addActionListener(this);//對.按鈕添加監聽事件
setContentPane(pane);
pack();//初始化窗體大小為正好盛放所有按鈕
}
//各個按鈕觸發的事件
publicvoidactionPerformed(ActionEvente){
/*
*如果是點擊數字按鈕那麼先要判斷是否在此之前點擊了+、-、*、/、=，如果是那麼com=true如果沒有com=
*false;或者是否點擊數字鍵，如果是i=1,如果沒有i=0;
*/
if(e.getSource()==number_key.one){
if(com||i==0){
result.text.setText("1");
com=false;
i=1;
}else{
text=result.text.getText();
result.text.setText(text+"1");
}
}elseif(e.getSource()==number_key.two){
if(com||i==0){
result.text.setText("2");
com=false;
i=1;
}else{
text=result.text.getText();
result.text.setText(text+"2");
}
}elseif(e.getSource()==number_key.three){
if(com||i==0){
result.text.setText("3");
com=false;
i=1;
}else{
text=result.text.getText();
result.text.setText(text+"3");
}
}elseif(e.getSource()==number_key.four){
if(com||i==0){
result.text.setText("4");
com=false;
i=1;
}else{
text=result.text.getText();
result.text.setText(text+"4");
}
}elseif(e.getSource()==number_key.five){
if(com||i==0){
result.text.setText("5");
com=false;
i=1;
}else{
text=result.text.getText();
result.text.setText(text+"5");
}
}elseif(e.getSource()==number_key.six){
if(com||i==0){
result.text.setText("6");
com=false;
i=1;
}else{
text=result.text.getText();
result.text.setText(text+"6");
}
}elseif(e.getSource()==number_key.seven){
if(com||i==0){
result.text.setText("7");
com=false;
i=1;
}else{
text=result.text.getText();
result.text.setText(text+"7");
}
}elseif(e.getSource()==number_key.eight){
if(com||i==0){
result.text.setText("8");
com=false;
i=1;
}else{
text=result.text.getText();
result.text.setText(text+"8");
}
}elseif(e.getSource()==number_key.nine){
if(com||i==0){
result.text.setText("9");
com=false;
i=1;
}else{
text=result.text.getText();
result.text.setText(text+"9");
}
}
/*
*對於0這個按鈕有一定的說法，在我的程序里不會出現如00000這樣的情況，我加了判斷條件就是
*如果text中的數值=0就要判斷在這個數值中是否有.存在?如果有那麼就在原來數值基礎之上添加0;否則保持原來的數值不變
*/
elseif(e.getSource()==number_key.zero){//result.text.getText()是得到text里內容的意思
if(com||i==0){
result.text.setText("0");
com=false;
i=1;
}else{
text=result.text.getText();
if(Float.parseFloat(text)>0||Float.parseFloat(text)<0){//Float.parseFloat(text)就是類型轉換了，下面都是一樣
result.text.setText(text+"0");
}else{
if(text.trim().indexOf(".")==-1){
result.text.setText(text);
}else{
result.text.setText(text+"0");
}
}
}
}elseif(e.getSource()==number_key.ce){
result.text.setText("0");
i=0;
com=true;
//text="";
defbutton=0;
}
/*
*本程序不會讓一個數值中出現2個以上的小數點.具體做法是:判斷是否已經存在.存在就不添加,不存在就添加.
*/
elseif(e.getSource()==number_key.point){
if(com||i==0){
result.text.setText("0.");
com=false;
i=1;
}else{
text=result.text.getText();
if(text.trim().indexOf(".")==-1){
result.text.setText(text+".");
}else{
result.text.setText(text);
}
}
}//獲得點擊+之前的數值
elseif(e.getSource()==number_key.plus){
com=true;
i=0;
defbutton=Double.parseDouble(result.text.getText());
symbol=1;
}//獲得點擊-之前的數值
elseif(e.getSource()==number_key.sub){
com=true;
i=0;
defbutton=Double.parseDouble(result.text.getText());
symbol=2;
}//獲得點擊*之前的數值
elseif(e.getSource()==number_key.mul){
com=true;
i=0;
defbutton=Double.parseDouble(result.text.getText());
System.out.println(defbutton);
symbol=3;
}//獲得點擊/之前的數值
elseif(e.getSource()==number_key.div){
com=true;
i=0;
defbutton=Double.parseDouble(result.text.getText());
symbol=4;
}elseif(e.getSource()==number_key.equal){
switch(symbol){
case1:{//計算加法
doublead=defbutton
+Double.parseDouble(result.text.getText());
result.text.setText(ad+"");
i=0;
text="";
break;
}
case2:{//計算減法
doublead=defbutton
-Double.parseDouble(result.text.getText());
result.text.setText(String.valueOf(ad));
i=0;
text="";
break;
}
case3:{//計算乘法
doublead=defbutton
*Double.parseDouble(result.text.getText());
result.text.setText(ad+"");
i=0;
text="";
break;
}
case4:{//計算除法
doublead=defbutton
/Double.parseDouble(result.text.getText());
result.text.setText(ad+"");
i=0;
text="";
break;
}
}
System.out.println(com);
}
System.out.println(result.text.getText());
}
@SuppressWarnings("deprecation")
publicstaticvoidmain(String[]args){
Jisuanqiloveyou=newJisuanqi();
loveyou.show();
}
}
//計算器數字按鈕定義面板
classNumber_KeyextendsJPanel{
/**
*
*/
=1L;
JButtonzero=newJButton("0");//數字鍵0
JButtonone=newJButton("1");//數字鍵1
JButtontwo=newJButton("2");//數字鍵2
JButtonthree=newJButton("3");//數字鍵3
JButtonfour=newJButton("4");//數字鍵4
JButtonfive=newJButton("5");//數字鍵5
JButtonsix=newJButton("6");//數字鍵6
JButtonseven=newJButton("7");//數字鍵7
JButtoneight=newJButton("8");//數字鍵8
JButtonnine=newJButton("9");//數字鍵9
JButtonplus=newJButton("+");
JButtonsub=newJButton("-");
JButtonmul=newJButton("*");
JButtondiv=newJButton("/");
JButtonequal=newJButton("=");
JButtonce=newJButton("清零");//置零鍵
JButtonpoint=newJButton(".");
Number_Key(){
setLayout(newGridLayout(4,4,1,1));//定義布局管理器為網格布局
setBackground(Color.blue);//設置背景顏色
//添加按鈕
add(one);
add(two);
add(three);
add(four);
add(five);
add(six);
add(seven);
add(eight);
add(nine);
add(zero);
add(plus);
add(sub);
add(mul);
add(div);
add(point);
add(equal);
add(ce);
}
}
//計算器顯示結果的窗體
classResultextendsJPanel{
/**
*
*/
=1L;
//text先是輸入和結果
JTextFieldtext=newJTextField("0");
@SuppressWarnings("deprecation")
Result(){//講輸入的數字或得到的結果在text的右邊顯示
text.setHorizontalAlignment(SwingConstants.RIGHT);
text.enable(false);//文本框不能編輯
setLayout(newBorderLayout());//設定布局管理器邊框布局
add(text,BorderLayout.CENTER);//text放置在窗體的中間
}
}
直接復制保存成Jisuanqi.java可以直接運行了
㈤ 用java語言編寫一個計算器的程序
import java.util.*;
public class Test {
public static void main(String[] args) {
Scanner input = new Scanner(System.in);
System.out.println("*****************簡易計算器****************");
System.out.println("*\t\t\t\t\t*");
System.out.println("* 使用說明： 1.加法 2.減法 3.乘法 4.除法 *");
System.out.println("*\t\t\t\t\t*");
System.out.println("*****************************************");
for(int i=0;i<100;i++){
System.out.print("\n請選擇運算規則：");
int num = input.nextInt();
switch(num){
case 1:
System.out.println("\n******你選擇團含了加法******\n");
System.out.print("請輸入第1個加數:");
int jiashu1 = input.nextInt();
System.out.print("請輸入第2個加數:");
int jiashu2 = input.nextInt();
System.out.println("運算結果為:" + jiashu1 + " + " + jiashu1 + " = " + (jiashu1 + jiashu2));
break;
case 2:
System.out.println("\n******你選擇了減法******\n");
System.out.print("請輸入被減數:");
int jianshu1 = input.nextInt();
System.out.print("請輸入減數:");
int jianshu2 = input.nextInt();
System.out.println("運算結果為:" + jianshu1 + " - " + jianshu2 + " = " + (jianshu1 - jianshu2));
break;
case 3:
System.out.println("\n******你選擇了乘法******\n");
System.out.print("請輸入第1個因數:");
int chengfa1 = input.nextInt();
System.out.print("山攔請輸入第2個因數:");
int chengfa2 = input.nextInt();
System.out.println("運算結果為:" + chengfa1 + " * " + chengfa2 + " = " + (chengfa1 * chengfa2));
break;
case 4:
System.out.println("\n******你選擇塌唯笑了除法******\n");
System.out.print("請輸入被除數:");
double chufa1 = input.nextInt();
System.out.print("請輸入除數:");
double chufa2 = input.nextInt();
System.out.println("運算結果為:" + chufa1 + " / " + chufa2 + " = " + (chufa1 / chufa2) + " 余 " + (chufa1 % chufa2));
break;
default:
System.out.println("\n你的選擇有錯，請重新選擇!");
break;
}
}
}
}
㈥ 用java編寫一個簡單計算器
/*
* @(#)JCalculator.java 1.00 06/17/2015
*/
importjava.awt.*;
importjava.awt.event.*;
importjavax.swing.*;
/**
* A simple calculator program.
*<p>I saw this program in a QQ group, and help a friend correct it.</p>
*
*@authorSingyuenYip
*@version1.00 12/29/2009
*@seeJFrame
*@seeActionListener
*/
{
/**
* Serial Version UID
*/
= -169068472193786457L;
/**
* This class help close the Window.
*@authorSingyuenYip
*
*/
{
publicvoidwindowClosing(WindowEvent we) {
System.exit(0);
}
}
inti;
// Strings for Digit & Operator buttons.
privatefinalString[]str= {"7","8","9","/","4","5","6","*","1",
"2","3","-",".","0","=","+"};
// Build buttons.
JButton[]buttons=newJButton[str.length];
// For cancel or reset.
JButtonreset=newJButton("CE");
// Build the text field to show the result.
JTextFielddisplay=newJTextField("0");
/**
* Constructor without parameters.
*/
publicJCalculator() {
super("Calculator");
// Add a panel.
JPanel panel1 =newJPanel(newGridLayout(4, 4));
// panel1.setLayout(new GridLayout(4,4));
for(i= 0;i<str.length;i++) {
buttons[i] =newJButton(str[i]);
panel1.add(buttons[i]);
}
JPanel panel2 =newJPanel(newBorderLayout());
// panel2.setLayout(new BorderLayout());
panel2.add("Center",display);
panel2.add("East",reset);
// JPanel panel3 = new Panel();
getContentPane().setLayout(newBorderLayout());
getContentPane().add("North", panel2);
getContentPane().add("Center", panel1);
// Add action listener for each digit & operator button.
for(i= 0;i<str.length;i++)
buttons[i].addActionListener(this);
// Add listener for "reset" button.
reset.addActionListener(this);
// Add listener for "display" button.
display.addActionListener(this);
// The "close" button "X".
addWindowListener(newWindowCloser());
// Initialize the window size.
setSize(800, 800);
// Show the window.
// show(); Using show() while JDK version is below 1.5.
setVisible(true);
// Fit the certain size.
pack();
}
publicvoidactionPerformed(ActionEvent e) {
Object target = e.getSource();
String label = e.getActionCommand();
if(target ==reset)
handleReset();
elseif("0123456789.".indexOf(label) > 0)
handleNumber(label);
else
handleOperator(label);
}
// Is the first digit pressed?
booleanisFirstDigit=true;
/**
* Number handling.
*@paramkey the key of the button.
*/
publicvoidhandleNumber(String key) {
if(isFirstDigit)
display.setText(key);
elseif((key.equals(".")) && (display.getText().indexOf(".") < 0))
display.setText(display.getText() +".");
elseif(!key.equals("."))
display.setText(display.getText() + key);
isFirstDigit=false;
}
/**
* Reset the calculator.
*/
publicvoidhandleReset() {
display.setText("0");
isFirstDigit=true;
operator="=";
}
doublenumber= 0.0;
Stringoperator="=";
/**
* Handling the operation.
*@paramkey pressed operator's key.
*/
publicvoidhandleOperator(String key) {
if(operator.equals("+"))
number+= Double.valueOf(display.getText());
elseif(operator.equals("-"))
number-= Double.valueOf(display.getText());
elseif(operator.equals("*"))
number*= Double.valueOf(display.getText());
elseif(operator.equals("/"))
number/= Double.valueOf(display.getText());
elseif(operator.equals("="))
number= Double.valueOf(display.getText());
display.setText(String.valueOf(number));
operator= key;
isFirstDigit=true;
}
publicstaticvoidmain(String[] args) {
newJCalculator();
}
}
運行界面：
㈦ 用java編寫簡易計算器程序
//布局沒有調整，需要你自己去調整
代碼如下：
importjava.awt.FlowLayout;
importjava.awt.event.ActionEvent;
importjava.awt.event.ActionListener;
importjavax.swing.*;
{
JTextFieldc1;
JTextFieldc2;
JLabelc;
JLabelequal=newJLabel("櫻物=");
JLabelresult;
JLabelchoose=newJLabel("請選擇");
JButtonadd=newJButton("+");
JButtonsub=newJButton("-");
JButtonmul=newJButton("×"譽森);
JButtondiv=newJButton("÷");
JButtoncal=newJButton("計算");
JButtonclear=newJButton("清除");
publicJieMian(){
setLayout(newFlowLayout());
c1=newJTextField(5);
c2=newJTextField(5);
c=newJLabel("+");
result=new脊虛液JLabel("");
add(c1);
add(c);
add(c2);
add(equal);
add(result);
add(choose);
add(add);
add(sub);
add(mul);
add(div);
add(cal);
add(clear);
add.addActionListener(this);
sub.addActionListener(this);
mul.addActionListener(this);
div.addActionListener(this);
cal.addActionListener(this);
clear.addActionListener(this);
setVisible(true);
pack();
}
@Override
publicvoidactionPerformed(ActionEvente){
if(e.getSource()==add){
c.setText("+");
}elseif(e.getSource()==sub){
c.setText("-");
}elseif(e.getSource()==mul){
c.setText("×");
}elseif(e.getSource()==div){
c.setText("÷");
}elseif(e.getSource()==cal){
doublecc1,cc2;
try{
cc1=Double.parseDouble(c1.getText());
}catch(Exceptionex){
cc1=0;
}try{
cc2=Double.parseDouble(c2.getText());
}catch(Exceptionex){
cc2=0;
}
if(c.getText()=="+"){
result.setText(String.valueOf(cc1+cc2));
}elseif(c.getText()=="-"){
result.setText(String.valueOf(cc1-cc2));
}elseif(c.getText()=="×"){
result.setText(String.valueOf(cc1*cc2));
}elseif(c.getText()=="÷"){
if(cc2!=0){
result.setText(String.valueOf(cc1/cc2));
}else{
result.setText("NAN");
}
}
}elseif(e.getSource()==clear){
c1.setText("");
c2.setText("");
result.setText("");
}
}
publicstaticvoidmain(Stringargs[]){
JieMianjiemian=newJieMian();
}
}
㈧ 用Java設計一個簡單的計算器。
無聊寫了個，修復了下Bug：
importjava.awt.event.ActionEvent;
importjava.awt.event.ActionListener;
importjavax.swing.JButton;
importjavax.swing.JFrame;
importjavax.swing.JLabel;
importjavax.swing.JOptionPane;
importjavax.swing.JTextField;
{
=1L;
privateJButtonplus,rece,multiply,divice,reset;
privateJTextFieldone,two,result;
privatebooleandevice_falg=false;
privatefinalintwidth=400,height=300;
publicCalculate(){
super("修改密碼");
this.setLayout(null);
this.setSize(width,height);
init();
Layout();
}
publicvoidinit(){
plus=newJButton("加");
rece=newJButton("減");
multiply=newJButton("乘");
divice=newJButton("除");
reset=newJButton("清空");
one=newJTextField();
two=newJTextField();
result=newJTextField();
}
publicvoidLayout(){
this.add(newJLabel("第一個數")).setBounds(20,10,60,80);
this.add(one).setBounds(100,38,100,25);
this.add(newJLabel("第二個數")).setBounds(20,40,60,80);
this.add(two).setBounds(100,70,100,25);
this.add(newJLabel("結果")).setBounds(20,85,60,80);
this.add(result).setBounds(100,110,100,25);
this.add(plus).setBounds(70,170,80,25);
this.add(rece).setBounds(200,170,80,25);
this.add(multiply).setBounds(70,200,80,25);
this.add(divice).setBounds(200,200,80,25);
this.add(reset).setBounds(300,220,80,25);
plus.addActionListener(this);
rece.addActionListener(this);
multiply.addActionListener(this);
divice.addActionListener(this);
reset.addActionListener(this);
this.setVisible(true);
this.setDefaultCloseOperation(DISPOSE_ON_CLOSE);
}
publicbooleanFormat(){
booleanFLAG=false;
booleanflag=false;
Stringone=this.one.getText().toString().trim();
Stringtwo=this.two.getText().toString().trim();
if(one==null||one.equals("")||two==null||two.equals("")){
JOptionPane.showMessageDialog(getParent(),"請輸入完整信息!");
FLAG=false;
flag=true;
}
booleanboll_1=one.matches("[\d]{1,100}");
booleanboll_2=two.matches("[\d]{1,100}");
booleanboll_3=one.matches("[\d]{1,100}+[.]+[\d]{1,100}");
booleanboll_4=two.matches("[\d]{1,100}+[.]+[\d]{1,100}");
if(flag){
returnfalse;
}
if((boll_1&&boll_2)||(boll_3&&boll_4)||(boll_1&&boll_4)
||(boll_3&&boll_2)){
FLAG=true;
}else{
JOptionPane.showMessageDialog(getParent(),"請輸入數字!");
FLAG=false;
}
if(FLAG&&device_falg){
if(Double.parseDouble(two)==0){
JOptionPane.showMessageDialog(getParent(),"被除數不能為0!");
FLAG=false;
device_falg=false;
}
}
returnFLAG;
}
publicdoublePlus(doubleone,doubletwo){
returnone+two;
}
publicdoubleMultiply(doubleone,doubletwo){
returnone*two;
}
publicdoubleDivice(doubleone,doubletwo){
returnone/two;
}
publicdoubleRece(doubleone,doubletwo){
returnone-two;
}
publicvoidClear(){
one.setText("");
two.setText("");
result.setText("");
}
@Override
publicvoidactionPerformed(ActionEvente){
Objecto=e.getSource();
if(o==reset){
Clear();
return;
}
if(o==divice){
device_falg=true;
}
if(!Format()){
return;
}
doubleone=Double.parseDouble(this.one.getText());
doubletwo=Double.parseDouble(this.two.getText());
doubleresult=0;
if(o==plus){
result=Plus(one,two);
}elseif(o==rece){
result=Rece(one,two);
}elseif(o==multiply){
result=Multiply(one,two);
}elseif(o==divice){
result=Divice(one,two);
}
this.result.setText(""+result);
}
publicstaticvoidmain(String[]args){
newCalculate();
}
}
㈨ 用JAVA編寫一個簡單的計算器，要求如下
太麻煩了 說個思路, 過去字元串後 先獲取+-*%的下標.然後然後分割,獲取到一個數組或list
然後循環獲取() 按照數學運算順序拼起來,
然後把公式拆分一步一步操作就得出結果啦