java計算器布局代碼 java計算器的布局

求JAVA語言寫的計算器的代碼。用GridLayout布局。

package com.citi.Util;

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import java.awt.BorderLayout;

import java.awt.GridLayout;

import java.awt.Toolkit;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import javax.swing.*;

/**

* @author yc80549

*

*/

public class Calculator extends JFrame implements ActionListener {

/**

*

*

*/

private static final long serialVersionUID = 1L;

private JTextField expression = new JTextField();

private JPanel buttonContainer = new JPanel();

private JPanel operators = new JPanel();

private JButton b1 = new JButton("1");

private JButton b2 = new JButton("2");

private JButton b3 = new JButton("3");

private JButton b4 = new JButton("4");

private JButton b5 = new JButton("5");

private JButton b6 = new JButton("6");

private JButton b7 = new JButton("7");

private JButton b8 = new JButton("8");

private JButton b9 = new JButton("9");

private JButton b0 = new JButton("0");

private JButton bpoint = new JButton(".");

private JButton bracket1 = new JButton("(");

private JButton bracket2 = new JButton(")");

private JButton plus = new JButton("+");

private JButton minus = new JButton("-");

private JButton multiply = new JButton("*");

private JButton divide = new JButton("/");

private JButton getResult = new JButton("=");

private JButton backSpace = new JButton("Backspace");

private JButton clear = new JButton("C");

private JButton OFF = new JButton("OFF");

private StringCalculate2 cacu = new StringCalculate2();

public Calculator() {

super();

setVisible(true);

this.setLayout(new BorderLayout());

this.setSize(400, 220);

Toolkit tk = Toolkit.getDefaultToolkit();

int width = (int) tk.getScreenSize().getWidth();

int height = (int) tk.getScreenSize().getHeight();

this.setLocation((int) ((width - getSize().getWidth()) / 2),

(int) ((height - getSize().getHeight()) / 2));

this.locate();

this.addAllListener();

}

public void locate() {

buttonContainer.setLayout(new GridLayout(4, 4));

buttonContainer.add(b1);

buttonContainer.add(b2);

buttonContainer.add(b3);

buttonContainer.add(plus);

buttonContainer.add(b4);

buttonContainer.add(b5);

buttonContainer.add(b6);

buttonContainer.add(minus);

buttonContainer.add(b7);

buttonContainer.add(b8);

buttonContainer.add(b9);

buttonContainer.add(multiply);

buttonContainer.add(b0);

buttonContainer.add(bpoint);

buttonContainer.add(getResult);

buttonContainer.add(divide);

operators.add(bracket1);

operators.add(bracket2);

operators.add(backSpace);

operators.add(clear);

operators.add(OFF);

this.add(expression, BorderLayout.NORTH);

this.add(buttonContainer, BorderLayout.CENTER);

this.add(operators, BorderLayout.SOUTH);

}

public void addAllListener() {

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);

b0.addActionListener(this);

plus.addActionListener(this);

multiply.addActionListener(this);

divide.addActionListener(this);

minus.addActionListener(this);

bpoint.addActionListener(this);

bracket1.addActionListener(this);

bracket2.addActionListener(this);

getResult.addActionListener(new ActionListener() {

public void actionPerformed(ActionEvent e) {

try {

double result = cacu.parse(expression.getText());

expression.setText("" + result);

} catch (Exception e1) {

System.err

.println("invaild expression or RuntimeException");

}

}

});

clear.addActionListener(new ActionListener() {

public void actionPerformed(ActionEvent e) {

expression.setText("");

}

});

OFF.addActionListener(new ActionListener() {

public void actionPerformed(ActionEvent e) {

System.exit(1);

}

});

backSpace.addActionListener(new ActionListener() {

public void actionPerformed(ActionEvent e) {

expression.setText(expression.getText().substring(0,

expression.getText().length() - 1));

}

});

}

public void actionPerformed(ActionEvent e) {

JButton source = (JButton) e.getSource();

expression.setText(expression.getText() + source.getText());

}

public static void main(String[] args) {

Calculator cal = new Calculator();

cal.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

}

}

package com.citi.Util;

import java.util.Stack;

import javax.swing.JOptionPane;

public class StringCalculate2 {

private StackDouble numbers = new StackDouble();

private StackCharacter chs = new StackCharacter();

private boolean compare(char str) {

if (chs.empty()) {

return true;

}

char last = (char) chs.lastElement();

switch (str) {

case '*': {

if (last == '+' || last == '-')

return true;

else

return false;

}

case '/': {

if (last == '+' || last == '-')

return true;

else

return false;

}

case '+':

return false;

case '-':

return false;

}

return true;

}

public Double caculate(String str) {

StringBuffer sb = new StringBuffer(str);

StringBuffer num = new StringBuffer();

String tem = null;

char next;

while (sb.length() 0) {

tem = sb.substring(0, 1);

sb.delete(0, 1);

if (isNum(tem.trim())) {

num.append(tem);

} else {

if (num.length() 0 !"".equals(num.toString().trim())) {

Double d = new Double(num.toString().trim());

numbers.push(d);

num.delete(0, num.length());

}

if (!chs.isEmpty()) {

while (!compare(tem.charAt(0))) {

caculate();

}

}

if (numbers.isEmpty()) {

num.append(tem);

} else {

chs.push(new Character(tem.charAt(0)));

}

next = sb.charAt(0);

if (next == '-') {

num.append(next);

sb.delete(0, 1);

}

}

}

Double d = new Double(num.toString().trim());

numbers.push(d);

while (!chs.isEmpty()) {

caculate();

}

return numbers.pop();

}

public void caculate() {

Double b = numbers.pop();

Double a = null;

a = numbers.pop();

char ope = chs.pop();

Double result = null;

switch (ope) {

case '+':

result = a + b;

numbers.push(result);

break;

case '-':

result = a - b;

numbers.push(result);

break;

case '*':

result = a * b;

numbers.push(result);

break;

case '/':

result = a / b;

numbers.push(result);

break;

}

}

private boolean isNum(String num) {

return num.matches("[0-9.]");

}

public Double parse(String str) {

int start = 0;

StringBuffer sts = new StringBuffer(str);

int end = -1;

while ((end = sts.indexOf(")")) 0) {

String s = sts.substring(start, end + 1);

int first = s.lastIndexOf("(");

Double value = caculate(sts.substring(first + 1, end));

sts.replace(first, end + 1, value.toString());

}

return caculate(sts.toString());

}

public static void main(String[] args) {

String exp = JOptionPane

.showInputDialog("please input expression you want to caculate!");

if (exp.trim().equals("")) {

System.out.println("you have input nothing");

return;

}

StringCalculate2 sc = new StringCalculate2();

JOptionPane.showMessageDialog(null, "the result is: " + sc.parse(exp));

}

}

求Java計算器標準的布局代碼

是用awt和swing做的，很好看比單單用AWT做好看

import java.awt.*;

import javax.swing.*;

public class Conputer extends JFrame {

protected Container con = getContentPane();// 指向內容面板

protected JMenuBar a = new JMenuBar();// 菜單條

protected JMenu a1 = new JMenu("編輯(E)");// 菜單1

protected JMenu a2 = new JMenu("查看(V)");// 菜單2

protected JMenu a3 = new JMenu("幫助(H)");// 菜單3

protected JMenuItem a11 = new JMenuItem("復制(C)", 'C');// 菜單1的菜單項

protected JMenuItem a12 = new JMenuItem("粘貼(P)", 'P');// 菜單1的菜單項

protected JMenuItem a21 = new JMenuItem("標準型(T)", 'T');// 菜單2的菜單項

protected JMenuItem a22 = new JMenuItem("科學型(S)", 'S');// 菜單2的菜單項

protected JMenuItem a31 = new JMenuItem("幫助主題(H)", 'H');// 菜單3的菜單項

protected JTextField jtf = new JTextField(30);// 文本框

protected JButton[] jb = new JButton[27];

protected String[] arr = { "Backspace", "CE", "C", "MC", "7", "8", "9", "/", "sqrt",

"MR", "4", "5", "6", "*", "%", "MS", "1", "2", "3", "-", "1/x",

"M+", "0", "+/-", ".", "+", "=" };

protected JPanel jp = new JPanel();// 主面板

protected JPanel m = new JPanel();// 次面板

protected JPanel m1 = new JPanel();// 次次面板

protected JPanel m2 = new JPanel();// 次次面板

protected JPanel m3 = new JPanel();// 次次面板

protected JPanel m4 = new JPanel();// 次次面板

protected JPanel m5 = new JPanel();// 次次面板

protected JPanel m6 = new JPanel();// 次次面板

protected GridLayout glo = new GridLayout(6, 1, 3, 3);// 主網(wǎng)格布局

protected GridLayout glo1 = new GridLayout(1, 3, 3, 3);// 次網(wǎng)格布局

protected GridLayout glo2 = new GridLayout(1, 6, 3, 3);// 次網(wǎng)格布局

protected Conputer(String s) {

super(s);

a1.setMnemonic('E');

a1.add(a11);

a1.add(a12);

a2.setMnemonic('V');

a2.add(a21);

a2.add(a22);

a3.setMnemonic('H');

a3.add(a31);

a.add(a1);

a.add(a2);

a.add(a3);

this.setJMenuBar(a);// 菜單條完成

for (int i = 0; i 27; i++) {

jb[i] = new JButton(arr[i]);

}

jp.setLayout(glo);

jp.add(m1);

m1.add(jtf);

jtf.setEditable(false); jtf.setText("0."); jtf.setForeground(Color.BLUE); jtf.setBackground(Color.WHITE);

jtf.setHorizontalAlignment(JTextField.RIGHT);//文本顯示在右邊

jp.add(m2);

m2.setLayout(glo1);

m2.add(jb[0]);

m2.add(jb[1]);

m2.add(jb[2]);

jp.add(m3);

m3.setLayout(glo2);

m3.add(jb[3]);

m3.add(jb[4]);

m3.add(jb[5]);

m3.add(jb[6]);

m3.add(jb[7]);

m3.add(jb[8]);

jp.add(m4);

m4.setLayout(glo2);

m4.add(jb[9]);

m4.add(jb[10]);

m4.add(jb[11]);

m4.add(jb[12]);

m4.add(jb[13]);

m4.add(jb[14]);

jp.add(m5);

m5.setLayout(glo2);

m5.add(jb[15]);

m5.add(jb[16]);

m5.add(jb[17]);

m5.add(jb[18]);

m5.add(jb[19]);

m5.add(jb[20]);

jp.add(m6);

m6.setLayout(glo2);

m6.add(jb[21]);

m6.add(jb[22]);

m6.add(jb[23]);

m6.add(jb[24]);

m6.add(jb[25]);

m6.add(jb[26]);

m.add(jp);

con.add(m);

this.setResizable(false);// 不能用鼠標拉伸窗體

this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);//可以關閉窗體

this.setSize(380, 275);

this.setVisible(true);

}

protected Conputer() {

this("計算器");

}

public static void main(String[] args) {

new Conputer("計算器");

}

}

java計算器代碼

import java.awt.*;

import java.awt.event.*;

public class lvhaiya{

int tmp,sum,sum1,sum2=1,sum3=1;

String a,b,c,d;String s="";

Frame f=new Frame("計算器");

private String[]name={

"0","1","2","3","4","5","6","7","8","9","+","-","*","/","=","空格"

};

public Button[] button=new Button[name.length];

TextField t=new TextField("",30);

Panel p=new Panel();

Panel p1=new Panel();

Color color=new Color(100,170,90);

public lvhaiya(){

p1.setLayout(new GridLayout(5,5));

for(int i=0;iname.length;i++){

button[i]=new Button(name[i]);

p1.add(button[i]);

}

p.setLayout(new FlowLayout(FlowLayout.LEFT));

p.setBackground(color);

p.add(t);

f.add(p,BorderLayout.NORTH);

f.add(p1,BorderLayout.SOUTH);

f.pack();

f.setVisible(true);

f.addWindowListener( new WindowClose());

t.setText("0.");

for(int i=0;iname.length;i++){

button[i].addActionListener(new ButtonEventl());

}

}

public static void main(String[]args){

new lvhaiya();

}

class WindowClose extends WindowAdapter{

public void windouClosing(WindowEvent e){

System.exit(0);

}

}

class ButtonEventl implements ActionListener{

public void actionPerformed(ActionEvent e)throws ArithmeticException{

String command=e.getActionCommand();

if(command.equals("+")){

sum=Integer.parseInt(t.getText())+sum;

t.setText(String.valueOf(sum));

a=t.getText();

s="";

}

else if(command.equals("-")){

sum1=Integer.parseInt(t.getText());

b=t.getText();

s="";

}

else if(command.equals("*")){

sum2=Integer.parseInt(t.getText())*sum2;

t.setText(String.valueOf(sum2));

c=t.getText();

s="";

}

else if(command.equals("/")){

sum3=Integer.parseInt(t.getText());

d=t.getText();

s="";

}

else if(command.equals("=")){

if(a!=null){

t.setText(String.valueOf(sum+tmp));

}

if(b!=null){

t.setText(String.valueOf(sum1-tmp));

}

if(c!=null){

t.setText(String.valueOf(sum2*tmp));

}

try{

if(d!=null){

t.setText(String.valueOf(sum3/tmp));

}

}

catch(ArithmeticException a){

t.setText("除數(shù)不能為零");

}

}

else if(command.equals("空格")){

sum=0;

a=null;

b=null;

c=null;

d=null;

sum1=0;

sum2=1;

sum3=1;

tmp=0;

t.setText("0");

s="";

}

else{

s=s+command;

t.setText(s);

tmp=Integer.parseInt(s);

}

}

}

}

//按鈕可以自己美化一下 希望可以幫到你

JAVA計算器相關代碼求大神｛詳解｝

我給你找找

package com.bj.calcultor;

import java.awt.Frame;

import java.awt.GridLayout;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import java.awt.event.WindowAdapter;

import java.awt.event.WindowEvent;

import javax.swing.JButton;

import javax.swing.JPanel;

import javax.swing.JTextField;

public class Calcultor extends Frame implements ActionListener {

public static void main(String[] args) {//定義主方

new Calcultor();//創(chuàng)建匿名對象，并調用test()方法;

}

//定義按鈕名稱

String[] arr={"1","2","3","4","5","6","7","8","9","0","+","-","*","/","=","."};

JButton [] button=new JButton[arr.length];

JButton reset = new JButton("CE");

JTextField display = new JTextField(20);

//創(chuàng)建窗口，定義組件

//執(zhí)行窗口事件:關閉窗口

private class WindowCloser extends WindowAdapter {

public void windowClosing(WindowEvent we) {

System.exit(0);

}

}

public Calcultor(){

super("計算器");//定義標題

//定義面板容器，并布局

JPanel jpanel=new JPanel(new GridLayout(4,4));

//添加按鈕，并給按鈕添加名稱

for (int i = 0; i arr.length; i++) {

button[i]= new JButton(arr[i]);

jpanel.add(button[i]);

}

JPanel panel2 = new JPanel();

panel2.add("Northr", display);

display.setEnabled(false);

panel2.add("East", reset);

this.add("North", panel2);

this.add("Center", jpanel);

for (int i = 0; i arr.length; i++){

addWindowListener(new WindowCloser());

setVisible(true);

setSize(400,400);

pack();

button[i].addActionListener(this);

reset.addActionListener(this);

display.addActionListener(this);

}

}

@Override

public void actionPerformed(ActionEvent e) {//定義事件

// TODO Auto-generated method stub

Object target=e.getSource();

String lable=e.getActionCommand();

if(target==reset){

handleReset();

}else if("0123456789.".indexOf(lable)0){

handleNumber(lable);

}else{

hadleOperator(lable);

}

}

boolean isFirstDigit=true;

private void hadleOperator(String key) {

if(operator.equals("+")){

number += Double.valueOf(display.getText());

}else if (operator.equals("-")){

number -= Double.valueOf(display.getText());

}else if (operator.equals("*")){

number *= Double.valueOf(display.getText());

}else if (operator.equals("/")){

number /= Double.valueOf(display.getText());

}else if(operator.equals("=")){

number =Double.valueOf(display.getText());

}

display.setText(String.valueOf(number));

operator=key;

isFirstDigit=true;

}

private void handleNumber(String key) {

if(true){

display.setText(key);//把鍵值設置為文本框內容

}else if(key.equals(".") display.getText().indexOf(".")0){

display.setText(display.getText()+".");//把文本框內容設置：display.getText()+"."

}else if(!key.equals(".")){

display.setText(display.getText() + key);//把文本框內容設置：display.getText()+key

isFirstDigit=false;

}

}

private void handleReset() {

display.setText("0");

isFirstDigit=true;

operator="=";

}

String operator="=";

Double number=0.0;

}

如何java設計計算器并實現(xiàn)功能

java設計計算器，主要是使用java swing，對每個按鈕進行監(jiān)聽，實現(xiàn)相關功能，如下代碼：

package?com.qiu.lin.he;

import?java.awt.BorderLayout;

import?java.awt.Color;

import?java.awt.GridLayout;

import?java.awt.event.ActionEvent;

import?java.awt.event.ActionListener;

import?javax.swing.ImageIcon;

import?javax.swing.JButton;

import?javax.swing.JFrame;

import?javax.swing.JPanel;

import?javax.swing.JTextField;

import?javax.swing.SwingConstants;

public?class?Jisuanqi?extends?JFrame?implements?ActionListener?{

/**

?*?

?*/

private?static?final?long?serialVersionUID?=?1L;

Result?result?=?new?Result();?//?定義text的面板

Number_Key?number_key?=?new?Number_Key();?//?定義按鈕面板

//?當點擊按鈕+、-、*、/時，com?=?true

boolean?com?=?false;

//?當i=0時說明是我們第一次輸入，字符串text不會累加

int?i?=?0;

//?存放text的內容

String?text?=?"";

//?存放點擊按鈕+、-、*、/之前的數(shù)值

double?defbutton?=?0;

//?+、-、*、/的代號分別為1，2，3，4

int?symbol?=?0;

//?構造函數(shù)

Jisuanqi()?{

super("WangJiao");?//?設定標題

setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);?//?設定關閉窗體時退出程序

JPanel?pane?=?new?JPanel();?//?定義主面板

pane.setLayout(new?BorderLayout());

setBounds(380,?220,?30,?80);?//?前兩個參數(shù)是在屏幕上顯示的坐標，后兩個是大小

//?替換圖標

ImageIcon?icon?=?new?ImageIcon("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(jiān)聽事件

number_key.two.addActionListener(this);?//?對2按鈕添加監(jiān)聽事件

number_key.three.addActionListener(this);?//?對3按鈕添加監(jiān)聽事件

number_key.four.addActionListener(this);?//?對4按鈕添加監(jiān)聽事件

number_key.five.addActionListener(this);?//?對5按鈕添加監(jiān)聽事件

number_key.six.addActionListener(this);?//?對6按鈕添加監(jiān)聽事件

number_key.seven.addActionListener(this);?//?對7按鈕添加監(jiān)聽事件

number_key.eight.addActionListener(this);?//?對8按鈕添加監(jiān)聽事件

number_key.nine.addActionListener(this);?//?對9按鈕添加監(jiān)聽事件

number_key.zero.addActionListener(this);?//?對0按鈕添加監(jiān)聽事件

number_key.ce.addActionListener(this);?//?對置零按鈕添加監(jiān)聽事件

number_key.plus.addActionListener(this);?//?對+按鈕添加監(jiān)聽事件

number_key.equal.addActionListener(this);?//?對=按鈕添加監(jiān)聽事件

number_key.sub.addActionListener(this);?//?對-按鈕添加監(jiān)聽事件

number_key.mul.addActionListener(this);?//?對*按鈕添加監(jiān)聽事件

number_key.div.addActionListener(this);?//?對/按鈕添加監(jiān)聽事件

number_key.point.addActionListener(this);?//?對.按鈕添加監(jiān)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(fā)的事件

public?void?actionPerformed(ActionEvent?e)?{

/*

?*?如果是點擊數(shù)字按鈕那么先要判斷是否在此之前點擊了+、-、*、/、=，如果是那么com=true?如果沒有com=

?*?false;或者是否點擊數(shù)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");

}

}?else?if?(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");

}

}?else?if?(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");

}

}?else?if?(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");

}

}?else?if?(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");

}

}?else?if?(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");

}

}?else?if?(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");

}

}?else?if?(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");

}

}?else?if?(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");

}

}

/*

?*?對于0這個按鈕有一定的說法，在我的程序里不會出現(xiàn)如00000這樣的情況，我加了判斷條件就是

?*?如果text中的數(shù)值=0就要判斷在這個數(shù)值中是否有.存在?如果有那么就在原來數(shù)值基礎之上添?加0;否則保持原來的數(shù)值不變

?*/

else?if?(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");

}

}

}

}?else?if?(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(shù)值中出現(xiàn)2個以上的小數(shù)點.具體做法是:判斷是否已經(jīng)存在.存在就不添加,?不存在就添加.

?*/

else?if?(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(shù)值

else?if?(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(shù)值

else?if?(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(shù)值

else?if?(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(shù)值

else?if?(e.getSource()?==?number_key.div)?{

com?=?true;

i?=?0;

defbutton?=?Double.parseDouble(result.text.getText());

symbol?=?4;

}?else?if?(e.getSource()?==?number_key.equal)?{

switch?(symbol)?{

case?1:?{?//?計算加法

double?ad?=?defbutton

+?Double.parseDouble(result.text.getText());

result.text.setText(ad?+?"");

i?=?0;

text?=?"";

break;

}

case?2:?{?//?計算減法

double?ad?=?defbutton

-?Double.parseDouble(result.text.getText());

result.text.setText(String.valueOf(ad));

i?=?0;

text?=?"";

break;

}

case?3:?{?//?計算乘法

double?ad?=?defbutton

*?Double.parseDouble(result.text.getText());

result.text.setText(ad?+?"");

i?=?0;

text?=?"";

break;

}

case?4:?{?//?計算除法

double?ad?=?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")

public?static?void?main(String[]?args)?{

Jisuanqi?loveyou?=?new?Jisuanqi();

loveyou.show();

}

}

//?計算器數(shù)字按鈕定義面板

class?Number_Key?extends?JPanel?{

/**

?*?

?*/

private?static?final?long?serialVersionUID?=?1L;

JButton?zero?=?new?JButton("0");?//?數(shù)字鍵0

JButton?one?=?new?JButton("1");?//?數(shù)字鍵1

JButton?two?=?new?JButton("2");?//?數(shù)字鍵2

JButton?three?=?new?JButton("3");?//?數(shù)字鍵3

JButton?four?=?new?JButton("4");?//?數(shù)字鍵4

JButton?five?=?new?JButton("5");?//?數(shù)字鍵5

JButton?six?=?new?JButton("6");?//?數(shù)字鍵6

JButton?seven?=?new?JButton("7");?//?數(shù)字鍵7

JButton?eight?=?new?JButton("8");?//?數(shù)字鍵8

JButton?nine?=?new?JButton("9");?//?數(shù)字鍵9

JButton?plus?=?new?JButton("+");

JButton?sub?=?new?JButton("-");

JButton?mul?=?new?JButton("*");

JButton?div?=?new?JButton("/");

JButton?equal?=?new?JButton("=");

JButton?ce?=?new?JButton("清零");?//?置零鍵

JButton?point?=?new?JButton(".");

Number_Key()?{

setLayout(new?GridLayout(4,?4,?1,?1));?//?定義布局管理器為網(wǎng)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

class?Result?extends?JPanel?{

/**

?*?

?*/

private?static?final?long?serialVersionUID?=?1L;

//?text先是輸入和結果

JTextField?text?=?new?JTextField("0");

@SuppressWarnings("deprecation")

Result()?{?//?講輸入的數(shù)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(new?BorderLayout());?//?設定布局管理器邊框布局

add(text,?BorderLayout.CENTER);?//?text放置在窗體的中間

}

}

運行結果如下：

本文題目：java計算器布局代碼 java計算器的布局
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